[landtank]

Well I took the plunge and ordered the injectors from MAF today. I also called CDan and got a set of new seals for the injectors as well as the gaskets for the banjo bolt for the fuel line and a new fuel pressure regulator. Basically $130 for CDan and $170 (sans core charge) for MAF.

As an example of my driving style, I left yesterday morning for a service call and returned today, 890 miles travelled! So I should have some good mpg numbers as far as an improvement soon after the install.

Since I can remember it's been 14.2 mpg, hopefully this helps.

[landtoy80]

Rick, is that mpg with your summer or winter tires?
You run 265's in summer, right? If so, do you change the speedo gear when you go to the tiny tires?

[landtank]

Doesn't matter. summers are 315s BFG AT/Kos and winters are 315s ProComp X-Terrains. Geared at 4.88s with a kaymar in the rear and an ARB sans winch up front.

[IdahoDoug]

Rick,

Is that a freeway MPG figure? If so, what speed? Just wondering because I'm zeroing in on the MPG my 97 gets and it appears to be 13.5 around town which is quite a bit better than the 12 on the 93.

DougM

[CruisinGA]

Are you unhappy?

I haven't broken double digits since the drive home with the truck...

[ultimauk]

Wow, with stock gearing and 315's I get exactly 15mpg (GPS calibrated) at 65mph.

FWIW, with these tires and gearing my stock speedo is spot on.

[brent]

Landtank-

So does MAF send injectors out and then just wait for yours when you pull them, I have been considering it for a couple weeks here since I will be doing my HG soon, just not sure if I want to try and get by with the quick and dirty or spend a little and do it right..........

[woody]

Originally Posted by brent

... get by with the quick and dirty or spend a little and do it right..........

sounds like you've already made the decision....

MAF keeps used/cleaned injectors on hand, the core charge is their way of ensuring you return yours. Since Rick will be sending his current ones back in to MAF, there is actually a chance you'll end up running his injectors (post-cleaning, of course...lol)

Looking forward to the results...

[landtank]

Originally Posted by IdahoDoug

Rick,

Is that a freeway MPG figure? If so, what speed? Just wondering because I'm zeroing in on the MPG my 97 gets and it appears to be 13.5 around town which is quite a bit better than the 12 on the 93.

DougM

Mostly highway 75+ speeds. I gots places to go!

[concretejungle]

Rick, i was just checking out the injectors on-line last night at MAF. Do you feel this is a better approach than sending your injectors to RC engineering to have them cleaned/calibrated?

[landtank]

They use RC for their service so the fact that I can attack the problem over the weekend with a high probability of driving the truck on Monday made it an easy choice. The timing of this was to order them just after my CC close for the month so I can float the core charge on their dime.

[concretejungle]

excellent, i didn't know that's who they use.

[landtank]

Originally Posted by Steve-O

We do use RC yes, but the benifits of going through us comes from the no downtime. We do send the print out's with the injectors also so you can see what the new flow ratings are, its pretty impressive. We did see an improvment in fuel mileage, and a slight performance increase. Overall the vehicle just runs much nicer. A dirty injector will definately waste fuel mileage, even more if you are at slow speeds or it is leaking. Keep in mind that every vehicle will yield different results. Thanks, Steve.

This was from another thread.

[semlin]

the only downside to using MAF instead of RC is that they give you a printout for your new injectors but do not give you the printout on your old injectors so you don't know how bad or good they were. I am surprised RC does not offer this service themselves but I suppose they have a lot of different brands to worry about.

[Steve-O]

Originally Posted by semlin

the only downside to using MAF instead of RC is that they give you a printout for your new injectors but do not give you the printout on your old injectors so you don't know how bad or good they were. I am surprised RC does not offer this service themselves but I suppose they have a lot of different brands to worry about.

Unfortunately I have no way of knowing which ones are yours, I send out a lot of sets at one time. RC justs cleans/calibrates them and sends them back with the print out, mainly to show you what the new ones will perform like. If you were really curious about your old ones, you can send me those and I will have that set re-done for you. Unfortunately doing this, you will have to wait a couple of extra days.
Thanks for the order Rick, let me know how everything works out.
Steve.

[semlin]

Steve, I should probably have added to my previous post that I think you guys are offering a great service. There is little practical likelihood I could leave the truck off the road long enough to wait for RC so if I do this, it will be with you. I didn't mean to imply any criticism, just a little food for thought for any anal folks like me.

[Steve-O]

Originally Posted by semlin

Steve, I should probably have added to my previous post that I think you guys are offering a great service. There is little practical likelihood I could leave the truck off the road long enough to wait for RC so if I do this, it will be with you. I didn't mean to imply any criticism, just a little food for thought for any anal folks like me.

Dont worry, I didnt take that the wrong way at all. I agree with you on wanting to see the old injector specs, it ups the "WOW" factor. Its just too hard to track unfortunately. Steve.

[landtoy80]

I wounder if when you send in a set to be cleaned at any vendor that cleans and give a report, if they realy give you a real report on you injectors OR they just give you a line of BS so you feel good about sending them in???

[landtank]

Well just installed the injectors and I'd thought I'd share my thoughts on them.

First the truck does run noticeably smoother.

Second, the injectors came with the upper o-ring and rubber grommet but not the lower seal on the intake manifold side. Also new gaskets for the banjo bolt for the fuel rail were needed. I also replaced the fuel regulator while I was in there.

The whole process took about 2.5 hours. If you attempt thgis I would make sure you have a set of torx sockets as pulling the studs out to remove the EGR valve made that job easier.

Last week I recorded 15.2 mpg on a trip out to Springfiel;d MA. This week I have a call in Maine and then on Thursday I have to go to Bridgeport CT. On that CT trip I should be able to get an idea if this helped my MPG.

[landtoy80]

How did the old ones look?
Could you tell if there was buildup on the injector nozzle?

[landtank]

The nozzle is 2 small holes and couldn't tell from looking at it. It would be nice to know how they check out when they get cleaned, but Steve-O said that would be near impossible to track.

[Junk]

Good info Rick. Definitely please post back the results of your trip. I'm more interested in the smoothness than any mpg increase.

[Montana Cruiser]

Good to hear, so far it sounds like it was worth the time and $$. Looking foward to seeing your truck tomorrow, if you are getting 14.2 before the injectors with all those mods, there must be something a miss with mine, I may get 14 on a good day and I'm stock.

[landtank]

Actually 15.2, the 14.2 was a mistake. It does seem I'm on the high end of mileage, hopefully this doesn't change things.

[Rich]

Having balanced fuel flow to each cylinder should be a benefit to effeciency.

[Montana Cruiser]

15.2, ok now you are just trying to make me feel bad

I'll be curious to see how smooth its running as well. As with most things, a side by side comparison is always best. I feel as though mine is running well and smooth, but something may come to light once I see yours.

The Bass is chillin'

[MSGGrunt]

I had my injectors done on my 97 while in the process of replacing a head gasket. I went with Cruzin Performance in Big Rapids, MI... Total cost was $81.00 for an overhaul of all the injectors. For those that are curious I've posted my before and after results. The engine had around 100,000 miles on it at the time. The numbers do not mean much to me but, I did notice that the vehicle ran smoother.

Injector resistance: 13.7, 13.6, 13.6, 13.6. 13.6, 13.7

Spray Pattern Before: Fair on all 6
Spray Pattern After: Good on all 6

60 Second Pulsed Flow Delivery (mL) Before: 82, 82, 83, 83, 83, 84
60 Second Pulsed Flow Delivery (mL) After: 84, 84, 85, 84, 85, 85

100mL Pulsed Volume Before: 98, 98, 99, 99, 100, 100
100mL Pulsed Volume After: 99, 99, 100, 99, 100, 100

15 Second Static Flow (mL) Before: 86, 86, 87, 86, 86, 86
15 Second Static Flow (mL) After: 88, 88, 89, 89, 88, 88

100mL Static Flow Before: 99, 99, 100, 99, 99, 99
100mL Static Flow After: 99, 99, 100, 100, 99, 99

[super90]

I did my injectors about a year and a half ago when I pulled everything apart to replace EGR valve, VSV, all vacuum lines, various gaskets, the pesky heater hose, etc. etc.

I took mine to the local diesel injector service shop. They did a great job, provided a printout and replaced all the o-rings. I think it was roughly $25 per injector, with a one day turnaround time.

I have a feeling most cities of any size have an injection service company, you just have to find it. I don't see why anyone would have to ship these half-way across the country to be done.

FYI, mine where not flowing evenly at all, some were pretty plugged up. Truck runs very, very smooth now!

Robert Callaway
'94 FZJ
166k mi.
San Antonio, TX

[landtoy80]

MSG, its good to see that they were honest about your before and after numbers.
I would think they would PAD their numbers/results so that you would THINK they needed to be cleaned.

[Montana Cruiser]

MSG - The numbers mean very little to me, but the variance does, I would have thought that numbers with that little variance would not yield any noticable improvements. I guess this shows just how sensative the engine/injectors are to clogging etc.l

Are there any others that have numbers we could compare?