2000 Camaro misfires during acceleration

**JFos** · 04-23-2009, 01:29 PM

My 2000 Camaro 3.8L misfires terribly while accelerating at all RPM's. This only happens after the car has had time to warm up and continues to become more severe the longer it's driven. I've replaced fuel injectors, fuel filter, fuel pump, all plugs and plug wires. I've checked plugs and plug wires to make sure all are secure. I'm thinking it could be the coils? Need some suggestions...

**tbias** · 04-23-2009, 04:11 PM

mine was idling fine but when you put the fuel too it would pop&crack. turned out i had a (CRACKED) spark plug. it was rather hard to see it too. before i swaped coil packs id put new plugs in her.

**JFos** · 04-24-2009, 06:22 AM

*2000 Camaro 5.7L. And thanks I'll be checking the plugs as soon as I get off work, that'd be great if that was the case.

**Smittro** · 04-24-2009, 06:38 AM

3.8 5.7 ???

**NoscamaroSS** · 04-24-2009, 06:58 AM

Had a similar problem on the GF's car, it was a coil pack.

**JFos** · 04-26-2009, 07:20 PM

Perfect. Thanks for the help, I was hoping to hear I wasn't the only one with this problem before I ripped off the coils. Think I'll buy one coil pack and swap it out 'til I find the faulty pack.

**Spikito** · 04-26-2009, 08:59 PM

so is it a 3.8 or 5.7? thats a hell of a typo

I had the same problem, turned out to be a loose plug, but our first target was TC.

how many miles on the tranny, and when was the last time you had the fluid flushed. not just just serviced, that only replaces 3-4 quarts, i mean the whole 15

**JFos** · 04-27-2009, 06:17 AM

5.7, its a hell of a typo unless I spent all day picking up parts for my 3.8L Jeep. The fluid was flushed 5 weeks ago, and the plugs look fine. 100,000 on the tranny

**Spikito** · 04-27-2009, 11:01 AM

thats odd, youre supposed to flush the tranny at 100k, like you did.

I should have mentioned that sometiems the torque converter wants to lock up prematurely then it disengages quickly, making the care shutter, and feels just like a misfire, and usually under acceleration. This problem is usually mechanical, and is usually fixed by getting the tranny flushed. but it could also be the solenoid that locks up the TC. It is electrical, but its on the tranny, so i dont know if it will throw a code or not

**JFos** · 04-27-2009, 02:22 PM

its a 6-speed manual tranny...

**Spikito** · 04-27-2009, 03:32 PM

Originally Posted by JFos

its a 6-speed manual tranny...

well shit

All i can say is swap some coils, see what happens....are you getting a code at all? a mechanics programmer will tell you what cylinder(s) are missing, a regular ODBII will just give you the misfire code. P1402 maybe?

**JFos** · 04-27-2009, 04:05 PM

no code. i haven't had anyone check to see which cylinder(s) (its def more than one) is/are misfiring yet

**Spikito** · 04-27-2009, 04:11 PM

even without a code, they can bring up a screen that 8 circles, each representing a cylinder, with a zero beside it. i dunno how this trick would work in an M6 but in an A4 you powerbrake in reverse, tires wont spin and it will cause it to really misfire. The guy explained why that works, but i cant remember, anyway, each zero is a counter, itll show which ones are missing, and how many times. you gotta have over a certain number to throw code, but thisll show you any at all

**0rion** · 04-27-2009, 09:23 PM

Originally Posted by JFos

no code. i haven't had anyone check to see which cylinder(s) (its def more than one) is/are misfiring yet

that's the first thing I would do.

**JFos** · 04-28-2009, 08:02 AM

Originally Posted by Spikito

even without a code, they can bring up a screen that 8 circles, each representing a cylinder, with a zero beside it. i dunno how this trick would work in an M6 but in an A4 you powerbrake in reverse, tires wont spin and it will cause it to really misfire. The guy explained why that works, but i cant remember, anyway, each zero is a counter, itll show which ones are missing, and how many times. you gotta have over a certain number to throw code, but thisll show you any at all

Thats pretty cool, I'd love to know why that works. I picked up a coil today and plan on swapping it around to see if I can find the shotty coil(s). If that fails its going in to have the cylinders tested.

**Toadman1** · 05-08-2009, 05:00 PM

I just posted up on another old post about something similar. Mines a 5.7 and misfires under acceration also and just feathering the gas in overdrive but it happens when it warmed up also. Is yours making a funny sound in the exuast like a missing?

**JFos** · 05-09-2009, 06:26 PM

Originally Posted by Toadman1

I just posted up on another old post about something similar. Mines a 5.7 and misfires under acceration also and just feathering the gas in overdrive but it happens when it warmed up also. Is yours making a funny sound in the exuast like a missing?

There was that noise. I bought a coil pack and moved it around trying each coil pack. Eventually I found one of the packs was bad and it runs great.

**Toadman1** · 05-09-2009, 09:08 PM

There was that noise. I bought a coil pack and moved it around trying each coil pack. Eventually I found one of the packs was bad and it runs great.

Did you have an engine code for it or did it not show up? I'm only showing a code P1133? Also did you notice a sound coming from one side of the engine? I can hear a sound through my header and near the top of the engine on the passenger side but my driver is quiet.

**Toadman1** · 05-11-2009, 01:17 PM

It ended up the spark plug wire came loose.

**JFos** · 05-12-2009, 09:20 PM

Originally Posted by Toadman1

It ended up the spark plug wire came loose.

Good to hear...much easier and less stressful fix than the faulty coil pack. A spark plug would've been my first suggestion had I not just replaced plugs, plug wires, fuel injectors and fuel filter.