Leak, can be cause for CAT failure.. But I've yet to see one either. One guy in mud claims he replace many CATS due exhaust leak. But offeres no poof.
I'm not crazey about even NAPA. Why, I suspect bootlegs are being returned as geinun, at all parts store. Again some will do what every they can get away with, and they do.
That is sign (in new OEM upper rad hose). Radiators cap not functioning properly. It signal, cap stuck. Which increase pressure in entire coolant system. Replace CAP ASAP with OEM. To much pressure and radiator top or the weakest point Will blow!
Junky hose, who knows.
I use tech stream. But make sure to view video I posted above.
Again some of these minor misfire do not set off a DTC, not even shows as pending.
No, or just may fool you. Although bootlegs do sometimes work for awhile. Get a good set or waste money on junk again.
Parts store (Advance Auto thur world pack), 2 of all 8 gap if not all 8 of Denso bad. WTF. Returns perhaps!
Holiday gift.
I buy Denso TT & regular spark plug and NGK, Denso coils and denso boot kits here. In over 100 sets of plugs, every spark plug gap perfect.
DENSO is a global choice for top automakers, with multiple vehicle models rolling off the assembly line with DENSO auto parts under the hood.
www.densoautoparts.com
Check vacuum leaks with gas like propane. Search youtube on how.
It's not only hoses that leak. I've seen where intake manifold gasket reused, put in backwards and or it's bolts/nuts not torque. There's a thread going now, guy had misfire. Did compression test, Failed. Pulled head. Found two burt/cracked valves. My bet; Improper intake manifold install. Result in vacuum leak between ports of bad valves.
My torque wrenches, which I've many digitals sizes (1/4, 3/8, 1/2 and 3/4"). Are my most used tool, during assemble. That and a thumb drive, so I can never cross thread a bolt or nut.
I torque and mark:
I mark all bolt/nut/parts with paint (yellow today). No paint mark, torque wrench comes back out.
Understand the service, and taking you time. We're not a shop, trying to beat the clock.
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Yes and yes. Borescope on Amazon $100 w/8mm directional camera. You can look back at valves. I've a 360 degree 6mm directionly. They self explanatory on use, plug and play.
Compression test is easy! But must follow FSM. Fuel off, t-body wide open, engine at operating temp, RPM 250 or better. So be ready and fast.
We can do fuel pressure test and leak down test,. It's laid out, in the FSM
But the 07-07 will stall on hot days, after ascending hill or passing. Then as we let off the gas pedal. Engine dies! They call it vapor lock, but it's not. If hook to OBDII and scan before key off. May see bank 1 & 2 lean. Replace the fuel pump and all good. Done many including my test vehicle.
98-05, tend to crank and fail to fire-up. Then works, then doesn't. Almost alway fuel pump. Seems to be around 25oK miles.,
If you install a block off instead of my S.A.I filter mod or replace S.A.I pump periodically. You'll not be street legal drive on public roads, HWY, steerts.
I can't express enough. How much I'm against block-off kits. I also, see issue coming to me with them installed. Owner must remove, to get into my shop. Unless he trialer in and has no plates
Why block off SAI. I've written up free to the world. A step by step solution. That I've back tested over last 5 years now. Works perfectly. Which keeps, all emissions equipment as factory intend, just better and reduces long term cost.
Some, say my state doesn't check emissions. Good for them. But are they living on different blue ball then us. Or just one of those, that will do whatever they can get away with. Please leave me alone, than. Sure it is small thing, but it does help. I hate those coming in mud justifying block-off kits.
Additionally the starter can be done, and added benefit intake gaskets replaced. Which rubber gasket are shrinking with time. These can, produce a vacuum leaks.
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Takes 3 second and $20 to replace my S.A.I. filter. Sure takes work to install. But once in, it's cake.
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Some have their doubts on my theories and procedure. spark plugs, caliper bolt, propellers shaft slide yoke lube, full 12qt AT flushes, cone washers, snap rings, locking washer of wheel bearing, ball joint & TRE R&R, etc. That's find! I just call it like I see it. I do change, when shown I'm wrong or come up with better procedure.
But the S.A.I filter can cause more than $20K damage. I've seen it more than once. Don't doubt me on this.
I known of a shop foreman, in COsp at Japanese auto. That telling his team about the S.A.I. filter mod. Let's hope more good shops offer it.
As I'm now find they are failing around 150K miles and 15 to 18 years.
Sorry for rambling on. I'm home with Covid and can barely see or walk. Freakin Chine gift to us..
