rich smelly and farty

[Money pit Beretta]

I see it now! Fudge!
Nevermind on what I said.

[themixer]

how common are plugged return lines? what would my fuel pressure be if they are clogged?

[3X00-Modified]

Your fuel pressure should not be over 43 with the vacuum line disconnected from the regulator.

[themixer]

got the flow matched injectors today, time to get busy installing them

[themixer]

injectors installed, car is still not running correctly. Stumbles upon acceleration. Going to pick up a fuel pressure tester and report back. This is very odd

[themixer]

the other odd thing is if I switch back to my automatic computer, the car will barely idle. Just dips up and down and stalls. Manual computer I bought here seems at least to idle. I am really hoping now I have a fuel problem, not sure what else to replace.

[themixer]

I have figured out my really bad stumble upon acceleration, it was the EGR gasket had a rather large leak. got a new one seems to be a lot better but i still have a stumble upon acceleration, still have a rich smell, and the car will not idle smoothly. If you have your hand on the top of the motor you can feel it stumbling. Give it a bit of gas it runs very smooth. At WOT, it has lots of power. When pressing the gas to the floor it has a stumble that feels almost consistent with the position of the pedal. Should I be looking at a TPS? Still have yet to try the fuel pressure due to lack of equipment. test but holy @#Q$@#$ i hope its that.

If my fuel pressure checks out, what are my next options?

I am completely baffled and going to start reading the GM factory service manuals to see if there is anything I can find to help with this. I have been working with this crappy idle and rich smell ever since i bought the car and not from lack of working on it, i am still failing. I am really willing to do anything to get this solved

[ShaneLT(ShaneZ26)]

the ecm i had was an auto for the same year 1991 replaced with a 1991 5 speed one (shane on this site)

I have another set of injectors, what could be the problem with them?

Me? Huh?

[themixer]

different shane, it was off bstuff

[ShaneLT(ShaneZ26)]

LOL OK.

[themixer]

well i replaced the TPS and have seen the greatest improvement yet. the smoothness of the idle is much improved, and also is the hesitation. mind you the one i put on was just as old as the one i took off. I will be picking up a new AC delco one ASAP to try will report back.

[themixer]

In the end the TPS sensor did not do anything. Still having the exact same issues

Well i finally got around to getting the fuel pressure tester, and it seems normal. With the FPR unplugged getting a very solid 43-47psi. What should my pressure be at idle? I was reading 30-37psi. With any flip of the throttle it was right back up to 43-47psi.

What are the chances of the PCV valve going bad or MAP sensor. In the GM service manual it says these could cause an issue? I have checked the vac lines going to both and they seem perfect. When i disconnect the MAP sensor electrical connection it had a lot of trouble finding idle, and just runs very boggy.

I am really down to the point now I have nothing left to test or replace. I could really use any input. This is such a low miles engine I know it should give me years of good service.

Any input would be appreciated!

[3X00-Modified]

You still also have the possibility of a stuck injector flooding one cylinder.

[themixer]

I have a new set of flow matched injectors on the car, same issue

[3X00-Modified]

What injectors are you running? and what is the ECM programmed for?

I guess I'm out... Hard to diagnose without being there to scan it myself. Sorry.