Horrible Misfiring! Tried almost everything! Need help!!!
 

I own a 1993 3.4V6 Camaro. I got it back in May of 2010. It ran great from May thru August. Here's the problem: I stopped to get gas, when I went to start the car it stalled, I turned the key again and the engine started but was misfiring horribly! I did some research and after almost 2 years of sitting and trying different things, I'm still having the same problem!

These are the items I checked/replaced: Fuel Pump (yes I cut the access hole!), fuel filter, fuel pressure, plugs, plug wires, ICM, and finally yesterday the computer! Just in case you're wondering, when I plugged in the computer (of course it was flashed!) the engine started immediately, but after running for 20-30 minutes went back to misfiring and stalling!

I've heard that this particular generation of Camaro had a few issues but was told that a new computer would fix the problem, but no.

Any guidance/help would be greatly appreciated! Would love to drive my Camaro again! Thanks!

Re: Horrible Misfiring! Tried almost everything! Need help!!!
 

93 is a 4th gen btw.

Have you checked the coils packs? You have 3. You need to use a volt meter to check the resistance for each one. I don't recall the spec you're looking for, but you can probably find it online.

Secondly, it could be an O2 sensor. You either have a single one near the entry of the Catalytic converter or there's one in each pipe coming down to the catalytic converter.

They should be one wire 02's.

Good Luck

Re: Horrible Misfiring! Tried almost everything! Need help!!!
 

Thanks! I'll check that and see what happens. Someone had also mentioned something about MAF sensor?

Response to your BTW: Didn't say it was 3rd gen, last time I was here there was a section for 4th gen, didn't see it this time so posted my thread where I thought best applicable! Btw wasn't neccesary seeing as how I clearly stated that my car is a '93! But thanks for your info!

Re: Horrible Misfiring! Tried almost everything! Need help!!!
 

Likely clogged catalytic converter. My sisters old 94 3.4 did the same thing. You can test it by disconnecting/removing the EGR valve. It will sound like ****, but if the misfire goes away and the power restores, the converter should be replaced.

Re: Horrible Misfiring! Tried almost everything! Need help!!!
 

Maf sensor could be the problem but not sure if they had the maf sensor in 93 yet or not.