S.A.I. Filter Modification, in VVT engines. To prevent its failure! Alert Alert! (1 Viewer)

[prickly]

Thanks for offering to help.
Number one point; is S.A.I filter gone or not or partial gone?

In addition: I'd also like to see see from you and everyone with 06-07 VVT that has CAT issue(s):

• All DTC (codes) every seen/recorded.
• Compress test, done by the book (FSM). i.e. Engine at operating temp. Power to fuel pump disconnected (wire harness block under body just below rear left door). Gas pedal fully depressed (this opens throttle body butterfly, the safe way). Full charge on battery ( keep a charge on battery, while testing) so you get a minimum of 250 RPM as each cylinder tested.

History of engine & vehicle:

• Has intake manifold every been off (reason it would have been: S.A.I pump or it's main SW work, starter replacement, intake gasket replacement, rodent chew damage under intake manifold like knock sensors wires, starter wires, S.A.I wires),
• Tuned. Always or just runs fine never needs tuning.
• Air filter. Has its seal been found curled, which allows excessive dust into intake. Has filter been replaced every 20K miles or sooner under dusty conditions.
• Any vacuum leaks
• Any exhaust leaks, from rear of either CAT up to heads.
• Conditions vehicle driven in. Here I'me very interested in dusty conditions driven in. Which if so, we tend to see a lot of dusty built up under intake manifold, on S.A.I pump and main switch and in thick bottom of engine valley.
• Prolonged idling (yes, no, kind of, don't know). The OEM states do not prolong idle, and defines as 20 minutes IIRC.
• Ever overheated.
• Does it tend to run hot (over 197F).
• Any fuel boiling episodes.

Logs of and in what weather condition and OAT:
Engine coolant temps (ECT).
Long term fuel trims (LTFT), while RPM & MPH steady and at what are the RPM & MPH.
What are intake air temps (IAT), outside air temp (OAT), sun, overcast, night during times logs are recorded of other data points.
CAT temps.

I know it's a lot to ask, so just get what you can.

Also if compression low or bad and clues to reason for it. I see so often where intake manifold removed without cleaning top engine really well first. Sand drops into intake ports, and or intake ports not protected and or not vacuumed while expose/and before buttoning up. In fact, it is such a big deal to me. I red flag any inspections, if history show intake manifold every off.
Another way sand gets into cylinder, is during spark plug removal. This is really only issue if coil top seal, have been allowed to get to old before plugs replaced. As they rubber seals shrink. It's more of issue to be concerned with. If vehicle in dusty or sandy conditions. We than tend to see sand on top of heads covers around coils and in valley.
Also I find , 1 in 4 air filter seal curled, allowing air/dust to bypass filter. Dust then goes directly into intake ports. This is due to carelessness, while installing air filter.

We also want to know if prolonged idling is a common occurrence or lot's of short drives (not making operating temp). Both can damage CATs.
If fuel mixture to rich, CAT can ignite and burn up.
CAT's are also damaged by coolant, so coolant issue are worth nothing.
Air leaks into CAT, will also burn them up.
Additionally, impact to a CAT can bust then up up.

For data collection: I use either Bluedriver or more recently OBDIImx+ and my smart phone (iphone). To watch and record data (logs) as I drive. Very useful tools, which I can also scan for DTC and clear them.

What I'm try to establish; if any other reasons for CAT failure and is the filter of S.A.I pump gone. Also what is compression and any clues in history as to why.

Here"s some screen shots of live view from my iphone and log I emailed myself (spread sheet). These are from and 07LX w145K I bought last month. I was doing a HWY high RPM burn out to clear any carbon & muck build up off CATs, A/F & o2 sensors. These were take on drive back from point of purchase at ~94f OAT, day of full sun, at ~5PM, just as starting to get overcast.

View attachment 3078465
Screen shot of iphone while stopped, next day.
View attachment 3078480
I found ECT and AT fluid #2 (automatic transmission fluid #2) temps getting to high, due to the typical radiator fins clogged. Likely guy who sold to me, probably didn't like they way in was running in summer heat. I've since washed muck from radiator fins, and drop ECT & AT temps from what's seen in spread sheet logs above, by about 20F.

Pictures of muck in radiator.
View attachment 3078481
View attachment 3078482

View attachment 3078483

That's a long list and I don't think I'll be able to give you all the details but I'll try to give you as much. Been a little busy lately and I don't really get much wrench time during week days.

Also, I was wondering, don't you think instead of routing an independent air filter to SAI pump, why not stretch the hose it into the factory airbox? Seal the connection real good and maybe add another small filter inside the filter box (for overkill protection) Do you recon any drawbacks? What's your opinion.

 

[jerryb]

toyota moved that intake to many different places in the past. None of them worked well. I think the best spot is the tacoma 2012 to 2015?
They never succeeded in placement or operation.

 

[SuperExciteBike]

Two data points. 2006 LX and 2007 LX both with bypass kits.

2007 LX470 173K with bypass kit installed after SAIS codes P1444 and P2440. Ran fine until 10K miles later, we have P0420, P0430 and various SAIS codes (P1613/P2440/P2445) sending it into limp mode.

vs.

2006 LX470 175K with bypass kit installed before any codes popped up. 17K miles later no issues. Runs great.

Both vehicles go off-road on occasion. Notably, the 2007 most often follows behind the 2006 while off road including in deep sand and thick dust. These conditions would contribute to air pump filter deterioration and catalytic damage on both but perhaps more so on the 2007.

According to the 2001LC theory this would would mean we may have preemptively caught or at least delayed catalytic converter failure for the 2006. Whereas for the 2007, the damage from deteriorated filter and gunked up cats had already been done.

Edit: Haven't taken the manifold off to inspect but if it gets to that, will try to post an update. PM me in a few months if I haven't updated or replied to this thread.

 

[2001LC]

That's a long list and I don't think I'll be able to give you all the details but I'll try to give you as much. Been a little busy lately and I don't really get much wrench time during week days.

Also, I was wondering, don't you think instead of routing an independent air filter to SAI pump, why not stretch the hose it into the factory airbox? Seal the connection real good and maybe add another small filter inside the filter box (for overkill protection) Do you recon any drawbacks? What's your opinion.

I see a few issue with routing SAI air intake from factory intake air filter pipe or box lid, But an interesting idea. As would only need regular factory filter replacement.
Issues:

• Would create a vacuum in air pipe, robbing combustion intake air.
• It would require more materials and labor to build.
• Create issues with air pipe removal. Such as breaking nipple off air pipe during any service requiring air pipe removal. Which there are may services we do remove air pipe.

My 1" filler design, works very well. It's very easy to replace and has no affect on any other system. Once engine cover off. It is a 10 second no tool, one handed service cost $20. It can be done as need, up to 5 year 40k miles in most cases. Or just do with intake air file (as needed or 20K miles).

Two data points. 2006 LX and 2007 LX both with bypass kits.

2007 LX470 173K with bypass kit installed after SAIS codes P1444 and P2440. Ran fine until 10K miles later, we have P0420, P0430 and various SAIS codes (P1613/P2440/P2445) sending it into limp mode.

vs.

2006 LX470 175K with bypass kit installed before any codes popped up. 17K miles later no issues. Runs great.

Both vehicles go off-road on occasion. Notably, the 2007 most often follows behind the 2006 while off road including in deep sand and thick dust. These conditions would contribute to air pump filter deterioration and catalytic damage on both but perhaps more so on the 2007.

According to the 2001LC theory this would would mean we may have preemptively caught or at least delayed catalytic converter failure for the 2006. Whereas for the 2007, the damage from deteriorated filter and gunked up cats had already been done.

Edit: Haven't taken the manifold off to inspect but if it gets to that, will try to post an update. PM me in a few months if I haven't updated or replied to this thread.

[Edit May 2023: CAT codes after block off or replaceable filter install. Indicate damage was done, due to missing filter. Compression likely has been compromised.]

Be very interesting to see::

• Compression test of both your engines.
• Condition of SAI pump (blower) filter. Although a bit late for good data point.
• Inside condition of main switch of each. (Shinny and clean or graying)
• Know more about block off system installed.

I find it strange you're now getting these DTC now. I've questions and can only guess at why:

• No block off plates installed in air tubes to exhaust manifold. Did you install them?
• Wiring in block off kit, has affected engine operation. What are you wired into?
• Has intake manifold, ever been removed (starter, rodent damage, SAI R&R, etc.)?
• Any issue with intake air filtration, like curled air filter seal (dust in air tube)?
• Condition of MAF sensor?
• Prolonged idling making marginal CAT worst.
• Tune issues.
• Compression issue. ***
• Head issue.
• Engine operating temp issue.

CAT's likely took some damaged before install of the kit. Knowing condition of SAI filter at time kit installed even now, would great be a clue.

I've not really studied the various S.A.I. block-off kits. As I do not use them, install or work on them. I've seen some wired into into MAF, Some without block-off plates, Some wired in elsewhere, Some just block off plates in SAI tube at exhaust manifold, Some require removing intake manifold others do not.

Getting P0420 & P0430 is very likely both CATs no longer usable. But I can't say that for sure. Since once we modify by wiring in block off kit, we go down a rabbit hole. But if system installed, did not included block off plates. Your may be killing more than the CATs. As we must stop SAI from allowing dust into exhaust ports. Either block it off, stop pump (no plates) which some dust "may" still enter.

The filter modification design, I've shown in this threads open page:
Has no affect on any system other than SAI filtration. As it is simply a replaceable filter. It's may reduce or increase air flow, to SAI pump, just a tad. Depending on if filter new or old, which the same applies to the factory non replaceable filter. Which both are made of foam rubber and in time will get clogged and will decompose. Difference is, you can look at modified filter and replace it easily.

The first 4.7L VVT to have this mod, which had all DTC: SAI & both CATs and more. Has worked flawless for years now.

 

[SuperExciteBike]

Update. Got the manifold off.

SAI pump filter completely gone. A section of the fan blades are missing.

Both check valves stuck open. Fan blade lodged in one. Foam filter lodged in other.

 

[2001LC]

Update. Got the manifold off.

SAI pump filter completely gone. A section of the fan blades are missing.

Both check valves stuck open. Fan blade lodged in one. Foam filter lodged in other.

Thanks for posting!

I've a few question, I hope you're willing to answer:

By "check valve" are you referring to #1 SW and valves inside it?
Any CAT DTC (codes)?
Have you checked compression?
Any signs of rodents, especial under intake manifold?

Tip: If you're keeping S.A.I system operational. You'll likely need replacement switches. Primary (#1) with it's air pressure sensor, and both (#2's) secondary. You may be able to clean up all three. But the air pressure sensor, will likely keep kicking off DTC (SW stuck closed).

 

[SuperExciteBike]

Thanks for posting!

I've a few question, I hope you're willing to answer:

By "check valve" are you referring to #1 SW and valves inside it?
Any CAT DTC (codes)?
Have you checked compression?
Any signs of rodents, especial under intake manifold?

Tip: If you're keeping S.A.I system operational. You'll likely need replacement switches. Primary (#1) with it's air pressure sensor, and both (#2's) secondary. You may be able to clean up all three. But the air pressure sensor, will likely keep kicking off DTC (SW stuck closed).

Check valves are the smaller two valves mounted under the rear plastic wiring harness.
Switching valve is the center one with pressure sensor mounted inside the V of the engine.
At least that's what I recall Toyota/Lexus part name refer to them as.

Yes, P0420 and P0430

Compression was checked with engine cold so may not tell us too much. Number was a little low on Cyl 6 and Cyl 3. Adding oil to both improved the compression in both.

Not doing this job again so replacing all SAIS components under the hood. Also replacing the o-ring and coolant bypass pipe which I accidently bumped into while tightening one of the air pump bracket bolts. It leaked a little coolant so probably broke the seal. Same idea, not doing this job again, so it gets replaced too.

Didn't inspect for wire damage yet but it appears possible something started building a nest.

 

[2001LC]

Yeah, I see what looks like the start of a nest. But no chew marks, which is good.

 

[SAR85]

@2001LC - Thank you for the thought and effort that has gone into the project.

Just to add my 2 cents:

On my 06 lc100, (Mid-Atlantic region- mostly highway use - low dust areas). the p0420/p0430 code first showed up at around 185,000 miles. I checked all the usual suspects - complete tune up , checked vacuum& exhaust leaks, AF & O2 sensors, etc and was unable to identify any issues that lead to the Cat failure (assuming that the cat was actually bad). I did remove the cat but did not observe any blockage as shown in your photos. I also tried the Italian tune-up without success. Also for reference the air injection system was operating normally (it went out a couple of years later)

My conclusion at the time was that the cat was Not “bad”, But rather was still operating at 80-90% efficiency - which combined with the very tight parameters Toyota had programmed for 06-07 was just low enough to set off the code.

My fix was to add the o2 sensor extenders ($10) to the rear o2 sensors as I was not willing to pay for new converters.

6 years have passed since then, and the codes did not come back- The vehicle now resides in a state that checks tailpipe emissions, and it continues to pass these emission tests with flying colors. ( with the original cats still in place…)

I would agree that adding a replaceable filter is a worthwhile investment to protect the air pump, valves, and possibly the cat.

I am making no judgement as to your conclusion on the cause of cat failure - Just adding a east coast perspective to your knowledge base.

My limited conclusion would be that All of the 06-07 rigs are ultimately going to experience P0420/P0430 codes in their life regardless of the conditions they are operated in. The cause- overly restrictive programming on Toyota’s part, Which sets the codes when anything less that 90%-95% cat efficiency is observed.

( 2 years later the air injection failed -hewitt kit solved that issue…)

Same code here last week, and one of the recommended repairable was the O2 sensor. Can you elaborate a little more on the O2 extender you mentioned? Are they a modification or an addition to existing sensors?

 

[Mark WV]

Same code here last week, and one of the recommended repairable was the O2 sensor. Can you elaborate a little more on the O2 extender you mentioned? Are they a modification or an addition to existing sensors?

Use these extenders on the rear O2 sensors- you do have to drill out the center of them to fit up onto the sensor. They space the O2 sensor so only the tip is exposed to the exhaust flow

 

[2001LC]

Same code here last week, and one of the recommended repairable was the O2 sensor. Can you elaborate a little more on the O2 extender you mentioned? Are they a modification or an addition to existing sensors?

O2 extenders and Hewwt block off kit, are not street legal.

Yes, one may pass emission test and state emission test stations don't inspect close enough, to know system modified with o2 extender.
But note @Mark WV stated:
"My limited conclusion would be that All of the 06-07 rigs are ultimately going to experience P0420/P0430 codes in their life regardless of the conditions they are operated in. The cause- overly restrictive programming on Toyota’s part, Which sets the codes when anything less that 90%-95% cat efficiency is observed.

( 2 years later the air injection failed -hewitt kit solved that issue…)"

1) The ONE Million-mile Toyota 4.7L 2UZ-fe VVT CATs did not fail, nor were P04220 or P0430 ever reported in history.

I've also worked on many 06-07 with from 50K to 270K miles, without CAT codes.

Those that did have P0420 & P0430 (both CATS) had failed S.A.I filters, in every case.

One that comes to mind, where both 02 extenders used and then later Hewitt block of kit installed. Past emission also. But when it came to me, for a PPI inspection. I recommended a compression test, which I don't normally in a PPI. Unless red flags, which extenders are a red flag. It failed compression test badly. It's worth noting the extenders where first add, then years later the Hewitt block off kit. What I found most interesting. This particular 06LC 4.7L VVT here in Colorado, was driven 5 days a week 8 hours a day, mostly on dirt roads. Why is this interesting to me? DUST!

2) O2 sensors do go bad. For which we get a DTC (CEL) for it. If after replacing, o2 DTC returns. Then issue is something up-stream of the o2.

Fooling the system with extenders, is not addressing the cause.

@Mark WV . I appreciated your comments and the documenting of the course (altering emission system) you took. I'd be very interested, in what the compression of all 8 cylinders are today?

 

[Mike NXP]

I'm in the market for another 2uz and have been checking out the GX470. I was scanning one of the rigs service records and thought it'd be relevant to post a recent service record here :

~|~CUSTOMER STATES THAT CHECK ENGINE, VSC WARNING LIGHTS ARE ON. NOTABLE POWER LOSS WHEN ACCELERATING UP HILL. ~|~P1441-P1444-P2440 SECONDARY AIR INJECTION VALVE STUCK OPEN FOR BOTH BANKS. REMOVED AIR INJECTION PUMP AND FOUND DEBRIS INCLUDING FOAM THAT HAS COME APART FROM INSIDE SYSTEM. DEBRIS HAS BEEN SPREAD ALL THROUGH OUT AIR INJECTION SYSTEM CAUSING VALVES TO STI ~|~REMOVED AND REPLACED ALL COMPONENTS OF AIR INJECTION SYSTEM INCLUDING 3 VALVES AND AIR PUMP ALONG WITH ALL CORRESPONDING GASKETS. TESTED AIR INJECTION SYSTEM AND IS OPERATING AS DESIGNED.


Sorta makes me a bit more biased towards the non vvti motor . Less parts seems to always = more reliable / less maintenance

Should I try to avoid the vvti when searching for my next truck ?

 

[fro20fow]

I'm in the market for another 2uz and have been checking out the GX470. I was scanning one of the rigs service records and thought it'd be relevant to post a recent service record here :

~|~CUSTOMER STATES THAT CHECK ENGINE, VSC WARNING LIGHTS ARE ON. NOTABLE POWER LOSS WHEN ACCELERATING UP HILL. ~|~P1441-P1444-P2440 SECONDARY AIR INJECTION VALVE STUCK OPEN FOR BOTH BANKS. REMOVED AIR INJECTION PUMP AND FOUND DEBRIS INCLUDING FOAM THAT HAS COME APART FROM INSIDE SYSTEM. DEBRIS HAS BEEN SPREAD ALL THROUGH OUT AIR INJECTION SYSTEM CAUSING VALVES TO STI ~|~REMOVED AND REPLACED ALL COMPONENTS OF AIR INJECTION SYSTEM INCLUDING 3 VALVES AND AIR PUMP ALONG WITH ALL CORRESPONDING GASKETS. TESTED AIR INJECTION SYSTEM AND IS OPERATING AS DESIGNED.


Sorta makes me a bit more biased towards the non vvti motor . Less parts seems to always = more reliable / less maintenance

Should I try to avoid the vvti when searching for my next truck ?

Good info.

And makes sense the filter serves larger purpose.
For me, the added perks of 06-07 far outweigh cons of some added complexity.

My filter failed in 2021. Paid $750 or so to install OEM assembly. 15 years before a foam filter needs replacing is pretty good IMO.

 

[2001LC]

Do this mod, adding replaceable filter and never worry about again.

Or

Avoid all VVTi engines, which includes most all Toyota & Lexus since mid 2005 thru today.

 

[BnvS]

OP great work. @2001LC

 

[2001LC]

FYI OP great work. So I did a mod taken from the 5.7l that disabled the AIP altogether and was cheap. It does tap into the MAF THA pin to trick the AIP to not turn on at all.

5.7L is much easier to mod with replaceable filters. I've be doing one soon. Parts cost should be under $100. and keep pollution controls working as designed.

 

[GremlinMobile]

 

[BnvS]

WTF man (@BnvS ), you come in my thread and push pollution. Sorry, but a lot of misconception and BS.

These block off systems are for those that think: If they can break the law and if not going to caught, then why not. They have no respect for others or the environment. Those special few, that think they have rights above everyone else. It's they guy caught on hind camera putting s*** on their buddies toothbrush when they think no one is looking.

Well I'm looking. Take you s*** out of here, Or I will!

1) The 4.7L (100 series) S.A.I system, does not direct emission from engine back into engine. It takes fresh air from under the intake manifold (valley cavity). Direct this fresh air with a blower motor & fan blade (S.A.I. pump). Into exhaust port of head, where air is preheated. This now heated air mixes with exhaust, travels into exhaust manifold, and then into CATs. This heats CATs faster, getting them to a minimal operating temp.

2) I'm seeing issues, with MAF sensors when these bypass system are connected to MAF. The MAF is a very sensitive device. It is the first reading the EUC gets, to make command decision. What issue: Fuel trims off, worst case to rich. This can dump raw fuel into CAT, and burn them up. Lean condition result in cylinder head temp increase. Resulting in CAT running to hot, resulting in excessive engine and exhaust heat. This heats the fuel lines and fuel, more than we'd normally see. Which is additive to fuel boil issues!

3) Is it legal. Only in off-road recreational vehicles, which are exempt from Federal EPA street vehicle emission laws.

Just because you can pass a state emission or have no state emission, does not make blocking off S.A.I. system legal under Federal Law. Federal laws says you can not modify a vehicle emission system. Unless proven it does not increase emissions above that of the manufactures system or it reduces emission further.
These laws were created to benefit all mankind.

I'll note here: The S.A.I mod I designed here, makes the system function better long term. In that in function the same, but illmates the #1 cause these systems fail.

4) What will effects of emission be. Very tiny increase in emission, per vehicle per day, if S.A.I disabled.
But hey. Since we can get away with it. Let's all pollute just a tiny bit more.
Oh, wait a minute:
Multiplied by number of vehicle in country (70% of vehicle sold worldwide) that have emission LAWs as USA. Times number of cold engine start ups, 2 per day. These laws went into effect around 2005. In 2005 66 million vehicle sold. That ~46 million cars a year, time 20 year, ~ 1 billion. Say 70% on the road and not EV. that 700,000,000 time the 2 cold start up a day. 1,400,000,000 times ~2 minutes per start up. That 2.8 billion minutes of less pollution per day.

2.8 billion minutes of increase in pollutants per day.

Sorry I apologize @2001LC. It was not my intention to piss you or hijack your thread. or anyone off.. I will take my post down..

I do however disagree on some of what you mention in terms of MAF and such. I also run OBD2 scanner and monitor my fuel trims and found no change on FT's.
Anyways not here to disagree. I find your post very informative and educational. I apologize again..

 

[04UZJ100]

WTF man (@BnvS ), you come in my thread and push pollution. Sorry, but a lot of misconception and BS.

These block off systems are for those that think: If they can break the law and if not going to caught, then why not. They have no respect for others or the environment. Those special few, that think they have rights above everyone else. It's they guy caught on hind camera putting s*** on their buddies toothbrush when they think no one is looking.

Well I'm looking. Take you s*** out of here, Or I will!

1) The 4.7L (100 series) S.A.I system, does not direct emission from engine back into engine. It takes fresh air from under the intake manifold (valley cavity). Direct this fresh air with a blower motor & fan blade (S.A.I. pump). Into exhaust port of head, where air is preheated. This now heated air mixes with exhaust, travels into exhaust manifold, and then into CATs. This heats CATs faster, getting them to a minimal operating temp.

2) I'm seeing issues, with MAF sensors when these bypass system are connected to MAF. The MAF is a very sensitive device. It is the first reading the EUC gets, to make command decision. What issue: Fuel trims off, worst case to rich. This can dump raw fuel into CAT, and burn them up. Lean condition result in cylinder head temp increase. Resulting in CAT running to hot, resulting in excessive engine and exhaust heat. This heats the fuel lines and fuel, more than we'd normally see. Which is additive to fuel boil issues!

3) Is it legal. Only in off-road recreational vehicles, which are exempt from Federal EPA street vehicle emission laws.

Just because you can pass a state emission or have no state emission, does not make blocking off S.A.I. system legal under Federal Law. Federal laws says you can not modify a vehicle emission system. Unless proven it does not increase emissions above that of the manufactures system or it reduces emission further.
These laws were created to benefit all mankind.

I'll note here: The S.A.I mod I designed here, makes the system function better long term. In that in function the same, but illmates the #1 cause these systems fail.

4) What will effects of emission be. Very tiny increase in emission, per vehicle per day, if S.A.I disabled.
But hey. Since we can get away with it. Let's all pollute just a tiny bit more.
Oh, wait a minute:
Multiplied by number of vehicle in country (70% of vehicle sold worldwide) that have emission LAWs as USA. Times number of cold engine start ups, 2 per day. These laws went into effect around 2005. In 2005 66 million vehicle sold. That ~46 million cars a year, time 20 year, ~ 1 billion. Say 70% on the road and not EV. that 700,000,000 time the 2 cold start up a day. 1,400,000,000 times ~2 minutes per start up. That 2.8 billion minutes of less pollution per day.

2.8 billion minutes of increase in pollutants per day.

Why don’t you drive a Prius then?

 

[GremlinMobile]

Why don’t you drive a Prius then?

Haha agreed. And why isn't he bashing on everyone who has a non SAIS version of this engine from earlier model years, if he's so concerned about the environment. He made up my mind as soon as he went on to do the moonbat math "X cars per year times two engine starts per day times gallons of CO2 emitted = over 9000 tons of OIL! lol

And the whole writeup in the beginning of the thread is laughable.. He calls it a "$20, 3 second no tool PM". Oh by the way you have to take the manifold off... haha

BnvS, please post the helpful info you posted somewhere else where people can make good use of it.

2001LC, why don't you go harp on everyone else who's doing 02 spacer mods and every other kind of mod that attempts to keep these trucks going at a reasonable rate?