Engine/Transmission (1998.5 - 2002) New 100hp injectors; truck stalls shifting into gear

[Tiger Rag]

A buddy of mine ordered new 100 hp injectors and I bought his rv275 injectors to put into my truck. We got the switch done with no issues. He shifted his into gear after we did his and it nearly stalled. We took it for a ride and doggone it is strong..... seems to run very smooth and powerful. We grabbed a bite to eat for dinner and got back into his truck and he shifted it into drive and it did stall this time. He started it let it warm up for several minutes and tried again and again and it continued to stall. It didn't do this when he had the rv275 injectors in his. Here is the info on his truck:



99 4x4 24v ctd. DTT auto transmission 89%, 355 rear end. Mad ECM, 100 hp injectors. I think that is pretty much it.



Any suggestions at to what the issues could be or a fix? His truck idles around 500 rpm I believe. He commented that my truck idled much higher at around 800 rpm. Don't know if this could be a factor or not. Clearly something isn't exactly right though. Suggestions, theorys, opinions and experience are greatly appreciated.



BTW, my truck runs great with the rv275's and the Edge Comp ! Slipped the clutch for the first time last night . Have to be careful with that. Guess South Bend will get a call from me before too long :{ .



Thanks in advance, Matt

 

[johncameron]

Mine idels at 800 too. That may be his problem. I thought the idle was not adjustable on the 24-valve trucks?

 

[Tiger Rag]

Don't know if the idle difference is because his truck is an auto and mine is a 6 speed? I see yours is a 6 speed as well.



We did a search last night and the only thing we found a possibility is a torx screw in the APPS. May try to adjust idle that way if we find an consensus on it.

 

[johncameron]

Don't quote me on this but isn't the idle speed controlled by the ECM from the cam position sensor?



When I installed my banks box I forgot to hook up the APPS wire before starting the truck. She fired up like normal until I hit the go pedal and as soon as I did the engine light came on with a warning noise! OOPS, turned it off and re-hooked it up and everything was fine after that.



With that story behind me, it must not be controlled by the APPS.



I got my clutch from Power By Poole and Olee is a great guy to deal with.

http://www.powerbypoole.com/home.html



John

 

[TGibbs]

I read about a stock truck auto stalling when it was put in gear and it was because the LP and VP was going bad. When it was put in gear, the LP would starve it of fuel and kill it????

 

[LEnglish]

I know on my 12V with the 370hp inj it droped my idle buy 200rpm so I had to adj it back up.

 

[Double J]

You might check this too. flash



This seems to fix most trucks who have the same symtoms you're having... including mine. It's worth a shot.

 

[Tiger Rag]

Double J, thanks for the link to that post. Looks like some good info there.





A couple of pretty knowledgeable folks we talked with said to make sure injectors lines were seated properly and make sure feed tubes weren't boogered up. We pulled the feed tubes and smoothed with some 600 grit emory paper and cleaned well as suggested to us. Truck still doing the same. We tried cracking injector lines to bleed air. Still no difference. The other thing suggested is to run them for a few days to see if they will seat themselves by the heating and contracting and clear the problem up. That is one of our upcoming steps now. I think the other thing we'll examine is the APPS. One other thing suggested is that the pop pressure could be off from the supplier. I guess that will be the last resort to get new injectors.



Thanks for the suggestions, any further ideas are appreciated.

Thanks, Matt

 

[Jetpilot]

Try having the ECm flashed with: TSB 18-015-00 Rev. A



The older trucks have had this problem a long time..... Normally this reflash cures the problem.



Doug

 

[Tiger Rag]

Try having the ECm flashed with: TSB 18-015-00 Rev. A



The older trucks have had this problem a long time..... Normally this reflash cures the problem.



Doug

Doug, sounds like good advice for a stock ECM, but he has a MAD ECM. Will he have to go to his supplier for this ECM and get it reflashed with updated programming? He installed the new ECM in July or August, not sure when the revised programming was done? Any thoughts?



Thank you very much for the suggestion, Matt

 

[JR2]

That reflash solved my problems. If your idle RPM is that low you need a reflash anyway. It should be around 800.

 

[Tiger Rag]

Forgot to update this one. My buddy changed injectors to another brand and the truck runs great now. Nothing against the other shop, his truck just didn't pair well with those injectors. They were very professional to deal with and sent another set to try, neither of which worked. Some sets of injectors and trucks just don't get along I guess. I will say this, the injectors he went back with were 85 hp injectors vs 100 hp. The 85 hp's are mine and were sitting on the shelf waiting for my clutch..... which is going in this weekend... . Con OFE SBC! Oo. He is picking up a set of 160 hp injectors to replace mine. I'll update if these new injectors give a problem. They are the same mfg as my in 85 hp injectors.



-Matt

 

[isb360]

Another thought: Give it a few days and several starts to see if it clears up on it's own. When I put the Mach II's in, my idle bounced around for a while, first overshooting, then undershooting until the ECM relearned how much fuel it needed to deliver with the new injectors to maintain the idle speed needed. Mine is a 5-speed, but when I snapped the throttle closed for first few times, idle dipped real low.

Perhaps the load of dropping the engine in gear is catching the ECM off guard and it stalls before it can compensate.

 

[BBliss]

what ever you do don't adjust the torx screw on the apps. this is set at the factory to align the voltage output and the position of the idle validation switchs built into the apps. once this setting is lost the apps will most likely have to replaced.

 

[KBaucom]

I have heard that if you have a high pressure injection line loose that it will stall. There was one of my trucks that i work on had the same problem he tightend up the last line and truck hasen't done it since. Hope it helps

 

[DuallRam]

I had the same problem. It didnt do it all the time. Since Ive had the catcher it hasnt done it