Fronts distort only with engine running

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stevdart

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Posted: May 07, 2004 at 7:22 PM / IP Logged

...(hopefully will see them)...eliminate problem on the first check? Everybody's dream!

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92astro

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Posted: May 08, 2004 at 1:22 PM / IP Logged

Well... I didn't see any sparks whatsoever. I guess it's off to chase loose/intermittent connections. That is unless there are other possibilities here?

Thanks.

DYohn

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Posted: May 08, 2004 at 2:32 PM / IP Logged

Did any of your wires seem to glow? (you have to be in a really dark area to see this.) The most commong causes for engine noise like you describe are problems with electrical system wiring (like bad sparke plug / coil / engine ground straps, cracked distributor cap, etc.) or bad head unit ground. You might try running a new ground lead for your head and not use the fatory ground lead. Also, make sure none of your speaker wires is damaged or touching ground at a connector. Good luck, the problem you have is one of the hardest to track down.

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92astro

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Posted: May 08, 2004 at 5:06 PM / IP Logged

Thanks DYohn

It was pitch black when I looked but I didn't find anything at all. I'll try running a new ground wire to the head unit, but it did seem to test fine giving me about 12.51 V.

This isn't going to be fun, I can tell already. Thanks again.

DYohn

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Posted: May 08, 2004 at 5:42 PM / IP Logged

Ground should have no voltage on it... but it's noise you're after, not voltage. Try running a new ground wire directly to the chassis (bare metal on the floor pan, not to a screw under the dash) and connect it to the head unit ground instead of using the factory wiring harness ground. It's a shot in the dark, but it is the easiest to do.

Now, did this system work fine before and then suddenly develop the noise?? If so, you will probably have to buy new spark plug, plug wires, dist. cap, rotor, coil wire, etc. because that is a much more likely source for the noise. COMPLETE electrical system tune up, but that's only about 50-50 that it's the problem. Also check the engine ground strap between the motor and the chassis (it's usually a flat braided cable) as it can get corroded and cause this problem....

No, this one is never fun and it can get darn expensive to find and fix. I wish yu luck.

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Fronts distort only with engine running

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