mechanic98

Hey guys. I have a 2001 Firebird 3.8L, 5 speed.... NO codes coming up... But for some reason when i hit the gas, it seems like it is misfiring. I replaced the fuel filter, Spark Plugs, Air filter and it has a new thermostat in it, 180*....

It does not do it all the time, only every few times driving it. I thought maybe it had some water or bad gas in it. I put some water remover, and its been about 3 tank fulls since i noticed this problem. I even used 93 octane the last two, still nothing different than before the tuneup stuff.

I'm thinking it could either be the cat converter, or even the fuel pump about to go (happend to my s-10)...

Only does this when i'm accelerating. Drives fine when i'm cruisin.

Any Ideas of what i might be able to check?

BTW, just bought the car and it has 77k miles on it.

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Ron
2001 Pontiac Firebird
3.8L V6 Vroom Vroom
Just purchased, so no mods yet

badbird5.7

try a good fuel injector cleaner

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mechanic98

On the second tankfull i included Lucas Fuel system Cleaner... think on the next tank i will try something else.

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Ron
2001 Pontiac Firebird
3.8L V6 Vroom Vroom
Just purchased, so no mods yet

Phate

Chevron Techron or Seafoam.

Stopped up cat is also a possibility.

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mechanic98

I'm going to be trying some seafoam today, I will see how that works. If it isn't that, i'm probably going to go ahead and replace the cat. Can't hurt anything by replacing it .

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Ron
2001 Pontiac Firebird
3.8L V6 Vroom Vroom
Just purchased, so no mods yet

FirebirdPhil

Or depending on if you have an emissions standards to meet, you could do a cat delete.

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"What if I told you insane was working fifty hours a week in some office for fifty years at the end of which they tell you to piss off; ending up in some retirement village hoping to die before suffering the indignity of trying to make it to the toilet on time? Wouldn't you consider that to be insane?"
-Steve Buscemi as Garland Greene in Con Air

mechanic98

Yeah, where i am located at, we have to do our emissions every year... for years 1996 up. My s-10 is going to be catless i believe, once i get to it... lol

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Ron
2001 Pontiac Firebird
3.8L V6 Vroom Vroom
Just purchased, so no mods yet

mechanic98

Update: Looks like i found the problem.

I will know for sure by the end of the day. Well, i replaced the spark plug Wires this time. After that, i noticed it still had a misfire... (Wires needed to be replaced anyways).

I remembered that i had some new coils in the garage from my grand am that i had a few years ago... So i figured, what the hell. I took off the first coil pack... replaced it with the new one... and started it up... I didn't hear a misfire... so i was like... Hmmm.

Then i closed the hood, and took a ride... Wow... Felt like it did before the misfire.. Looks like i fixed it. Good thing i had the coils in the garage... lol Think i'm going to replace them with Accel or MSD coils. 100 bucks, but if i get a better spark, its worth it.

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Ron
2001 Pontiac Firebird
3.8L V6 Vroom Vroom
Just purchased, so no mods yet

mechanic98

Well, that was it... Works like a champ. Woo HOo... I'm so happy to get it fixed... It was staring to really drive me crazy... lol

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Ron
2001 Pontiac Firebird
3.8L V6 Vroom Vroom
Just purchased, so no mods yet