OK, did major work on the engine, including new injectors, then it started but ran terribly rough. PCM set code for low voltage from TPS. So I unplugged the TPS and it started and ran fine. So I replaced the TPS. Next it gives me the code for Injector #7 open circuit. So i swapped the wires around for injectors number 5 and 7, clear the code, and voila! Engine runs like a beaut. Oh, and it set code for high voltage for TPS, as well as high O2 sensor voltage... So swaped wires, reset codes, and started it. Run it for a while, great smooth running wiht lots of power, shut it off, come back out, and PCM sets code for injector no.1 open circuit. So swap wires around for nos. 1 and 3 and PCM says "Good." Engine runs great now! No more codes. Yet. Any idea what is going on? I am guessing it will head to the other side of the engine now. It runs just great until the PCM sets code, then the engine is rough, and a popping noise comes from the engine. Really need help! Gotta get this thing running. Thanks in advance for your help! --Keagan

 

What do you consider major work? Need a little more info on what was done

 

New heads, new push rods, new injectors, new belly pan. new O2 sensors, true dual exhaust (no cats), new injectors, Plenum mod, new water pump, new radiator hoses. I think that was pretty much it.

 

Hey Keagan, glad to hear you as least made it through the major work. Did you label all the injector wires before you pulled them? I'm sure you know but you've been doing this with the -bat cable off? The PCM does need a bit to relearn so maybe time driving will right the problems. Fingers X'ed

 

Ok i was wondering about the plenum...

And i agree with taking the neg battery cable off and resetting the comp...

Last thing...would a picture of my engine bay help you at all to see if you crossed wires

 

Hey Patt, Yes I labeled all the wires BEFORE i took them off! So they are all on the right ones. And yes I always disconnect the negative battery cable to avoid blowing airbags and damaging electrical problems. I reste the PCM manually and so far no codes (And I put all the wires back on the correct injectors). Perhaps the PCm needed to re-program itself from the ground up to match the mods and new injectors. And yes the plenum has been fixed. So now running great, hopefully no codes. And yes I do have pics, just havent had time or fast enough internet to upload pics. I will post the outcome of this!

 

Well I guess time will tell..I was just wondering about the labeling..the injector wires are kinda lined up anyways..I have read thet they can be a bit sensitive at the connector points..IDK..as always looking foward to the pics..later bro..

 

I not sure what I was researching (truck stuff) but the results (on google) gave an 'images for ....' and the pic of you with your truck was in there..I was like I know that guy, he's a DF member!

 

So today it sets code P0505 now for IAC control system! Idk what in the world is going on...

 

seems like ur havin just a wiring problems, only thing in common between all ur probs would be the pcm or a ground?