hey again, i have eliminated my code errors from previous posts but now i have 1 more problem and no codes show up either, i go to start her up, turns over then right away dies be4 anything can happen anyone had this happen and know how it may be fixed all suggestions would be appreciated thanks.

 

mmmmkay. it could be numerous things wrong. whats your fuel pressure like? whats the cap rotor and all that jazz like? did you **** with the timing any? what did you do to make it do it? any repairs recently that you did? you did mention that you fixed some ****.

 

I recently replaced the injectors, the fuel pressure is up at 45psi, i did have some codes show up but they halvent shown up again yet, car will start but then will die within 2 sec. when i have the key on it makes a sort of "farting" sound that i can hear and isolate to being under the intake plenuem. would this sound imply a vacume leak of some sort? all help would be appricated thx

 

check the vacuum lines. does it run when you hit the gas? i think a vacuum leak would cause the car to idle high. also the car doesn't create vacuum when the car is shut off and the key is in the on position. sounds electrical. like a tps or iac motor. what is the tps output on voltage? should be at like .54 if i remember correctly. did you install the plenum gasket on correctly? i remember fighting with that mother****er for over a half hour to get it to line up. the first time i did it i didn't install it correctly and caused a HUGE vacuum leak. sounded like i had a turbo or a blower on it. i'll bet its the iac that is messed up. take it out and spray some carb cleaner on it then coat that bastard in WD40 but not too much. just a touch.

 

i did find another leak and that farting sound i mentioned went away when i just now replaced the vacume line, when i start the car it still dies, it still sounds like a huge leak is happening but the sound comes from my air filter, the voltage readout at my maf sensor is still low tho. when i give it gas it shuts off, strange thing is when i went to first start it today while cold it started and stayed running?

 

UPDATE!
ok i did a little test and put fuel straight into the intake and she ran a lot longer that what she has been running. from this im figure im running either lean or rich, i do have an adjustable fuel pressure reg. btw. i figure now my problem is a lack of fuel? i find this strange because it was running perfect this morning when i started it cold, didnt miss jsut the voltage at the maf was low and still is low, i have no vacume leaks everything is sealed properly what could the problem be its reallyyy starting to fustrate me because it starts at the turn of the key now just wont stay on. PLZ HELP!!

 

just throwing this out there ,but could you have the fuel pressure too high messing around to see if it were possible,and it is ,may try turning it down a little couldnt hurt,later jimmy

 

tired turning down the pressure did a bit but the same result happened in the end. ill try turning it down some more, what should the pressure be set at when the key is on? right now with just the key its at 41psi is that right?

 

try going down some more 41 psi is pretty close ,but you may have weak injectors , id try bleeding it at the shrader valve,( with engine cool ) let all press. off,turn switch on and let it prime ,try starting it .later jimmy

 

the injectors are brand new ford svo #24, but i will lower the pressure some more and ill post the results soon

 

I had the same problem on mine, I know it probably dont make much sense but it ended up being my Ignition module

 

ill keep the ignition module in mind but i came across a sort of discovery once again, i found that if i left my code reader plugged in when halving the car on it would actually run but still rough but at least i could check some things and this is what i got now, i hear a fairly significant sound like i have a supercharger coming from my air filter and i can also hear it at the front of the throttle body could this be some sort of vacume leak, the maf voltage is still very low, when it was running there was smoke and either water or gas coming out the back, and the idle would be ok for like 30 sec then it would start to wander then finally die any ideas, would be helpful please!

 

whistling sound,could be throttle body gasket ,vacuum hose on bottom of throttle body,i a c gasket,or i a c gasket on bottom plate,also be sure both hoses are on the side of the throttle body(pass. side).get a long bar or screwdriver find the e g r valve,put it on the e g r valve (thick metal part) hit it a couple of time ,not really hard ,but a good whack ,it may have carbon deposits on it and be stuck open,this will give you an up and down idle.hope some of this helps ,later jimmy

 

could the relays for my maf be bad, i got them all out of the car right now, im replacing them but i did notice few things about them, on just about each relay, 3 of the 5 prongs look as if their burned i donno if this is even possible but it could make scence i guess and may explain why the maf signal voltage is low maybe not all the current goes through, i dont have a vacume leak everyhting is tight. few years back i had to replace 1 of those relays on my iroc it was doing the same thing as mine almost just not as severe, it would run but if you let off the gas would die. i guess its worth a try they are 20 years old and look pertty gummed up post results soon

 

Hey, I just bought a 91 3.1 5 Speed Firebird. I dont have any keys(REPO-$500.00) SO i BYBASSED the vats system ( fuel pump relay and starter relay) and I cannot get it to stay running, it will start if I put gas directly into the throttle body, but I have to feather the gas pedal to keep it running, It wont idle. I have just bought a new fuel pump and fuel filter, replaced those.........anyone have any suggestions email me @ w_mortell@hotmail.com, please........

 

You need to check the timing.

Also my buddy and i were having a problem recently on his V6 MPFI and it would stall after he drove it and the engine heated up a little. We replaced the ignition module and the pickup coil to fix it.

The whistling sound you hear is probably the engine sucking low because it can barely run. When its healthy you probably wont hear it as much.

Now if the whistling is coming from either side of the engine you probably have a big vacuum leak. Theres a trick to finding a vacuum leak, i think its throttle body cleaner or carb cleaner, you spray it around the spot you think its leaking at, and if the engine picks up and runs better, you found it.

 

One tooth too far advanced on distr.timing... plus a probable manifold leak.