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i am having problems with my 95 3.4 firebird t5. after changing the engine and engine bay harness from a 95 camaro (engine bay fire) the car is running very rich. it will only run for 30 seconds then it shuts off. afterwards the oil smells like pure gas and the plugs are soaked with gas and need cleaned before it will start again. the car is not throwing any codes and i am out of ideas. any help would be great
thanks
yes actually, i had to buy an entire car to get the parts i needed so i put everything into the firebird since i knew that all of the new parts worked. i changed the engine, pcm, engine bay harness, everything i could think of. O ya i tried both pcm s and it still does the same thing. i would have changed fuel rails but the one from my car was on fire so i figured it wouldnt work
I was just reading our tech database and the injector sizes were changed during 1995 from 17 lbs (AC Delco 217-301) to 22 lbs (AC Delco 217-306), but the engine was also changed from the 3.4 to 3.8
I don't know if it's possible but you didn't use the stuff from a 3.8 right?
i dont think so. everything bolted up and looked the same. both cars were 3.4s with manual trannys. plus i drove the parts car from ohio to pa and it ran great. so it shouldnt be causing problems now. unless the injectors for the 3.4 did change mid year. but im using the pcm and harness from the other car so it should work even if they did.
thanks for the help Blizzard242
It's np.. I'm trying lol. It's hard through a forum without the car actually here. I would look into the fuel pressure regulator next. I've had 2 go out on me on my 3.8 A small O-ring on mine have always been a problem and cracked. I always had a new fpr on hand before I found out it was just a little O-ring problem. Oh well.
Now this is for my own learning but.. From my understanding if the car only runs for like 30 seconds then shuts off that's not enough time for the car to even go into closed loop and even use the o2 sensors.
Unless that's about the time when they do turn on and that's causing the car to shut down via faulty o2 sensors.
But if the o2 sensors are not to blame maybe a bad MAF sensor could be to blame during the open loop warm up.
yes i replaced the o2 sensors, ill try changing the fpr and maf i have a spares i think. i cant believe how fast this car can ruin a fresh oil change lol. i was also thinking about checking the return line maby with an air compressor while i have the fuel rail off.
thanks for the help everyone
there is no MAF sensor on the 3.4's. I would suggest replacing the Fuel pressure regulator, sometimes the rubber bladder will get old and start to leak. I think you can verify this by removing the vaccum hose that is attached to it and checking for fuel there. And no, the 02 sensors don't even start registering until they are warmed up enough to get a signal from the pos single wire sensors. It just runs off set fuel maps while in open loop. And no, they didn't change injectors mid year in any 3.4 AFAIK.
woops i just figured the sensor in the intake tube was a maf sensor, anyway can you buy a rebuild kit for a fpr? or should i take the parts from my spare fuel rail and use those?
Yeah like I said, the injectors were changed when the engine was in 95.
What do you mean by a set fuel map? Meaning it's just guessing on how much fuel to throw in there? I'm no expert tuner by any means but I would guess that open loop requires some kind of sensor input. Or did I misunderstand?
Closed loop means the engine is using sensor info to make decisions, Open loop is when the engine is running from tables because the senors aren't warmed up yet / giving it crap data.
You can buy rebuild kits for the FPR. My 3.4 bird was dumping boat loads of fuel into one side of the engine because of a bad regulator and that fouled the O2 sensor on that side. Replacing both at once did the trick if I recall correctly.
hell if you gonna buy a rebuild kit which is basically just the rubber bladder itself you might as well upgrade and get a holley adjustable FPR. It comes with a new bladder and everything.
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