94 camaro 3.4L backfiring and missing (HELP)

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70runnersixpac@comcast.net - 11 Feb 2005 22:33 GMT

Looking for a little help on finding a problem with my 94 camaro.

It has a 3.4L engine which when you accelerate will backfire and act
like it is missing, very rough but when you get up to speed say 50 mph
it will run fine until you accelerate again then it stumble all over
its self.

I have replace the cat, O2 sensors (2), EGR value and fuel filter but
no improvement.

Any leads as to where to look or what to change would be appreciated,
I also have another 94 camaro 3.4 which runs fine so I have a source
of parts to try.

thanks

Sarge

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355-Camaro - 11 Feb 2005 23:19 GMT

the problem is somewhere in the ignition. have u changed your spark plugs,
and spark plug wires lately?. make sure the plugs are gapped properly.
also make sure your timing is correct. i would also change dis. and the
coil. if it doesnt have a dis. then get a new coil pack for it.
If that doesnt work please get back with me for more info.
Matt Jarrett

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355-Camaro - 12 Feb 2005 07:01 GMT

have u checked the timing on it yet. what about he coil pack or the
distributer. and the coil?

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Neoacumen - 25 Feb 2005 23:52 GMT

I don't think it has a distributor (which means it's coil over plug design
or the distributor is all electrically controlled and no moving parts).
Also I don't think it has the markings to show you what degrees it's set at
because the computer does all the timing so they eliminated the timing tab.
The coil(s) could be bad. He's right about spark plug gap. Double check
it. If you have those bosch plugs, toss them. They are crap for domestic
cars. Get rapid fires or something good (made by ac delco). Maybe your
knock sensor is messin up?

> have u checked the timing on it yet. what about he coil pack or the
> distributer. and the coil?

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70runnersixpac@comcast.net - 12 Feb 2005 00:12 GMT

Yes, I did change the plugs and wires also

thanks

>Looking for a little help on finding a problem with my 94 camaro.
>
[quoted text clipped - 13 lines]
>
>Sarge

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