'92 Cadillac Sedan de Ville Problem - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-19-2003, 03:30 PM
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'92 Cadillac Sedan de Ville Problem

Hey Guys,

Haveing a problem with my Grandmothers '92 Cadillac Sedan de Ville(4.9L V. Basicly, it won't idle. After starting, it won't staying running at idle. When I give it gas, it runs fine, but as soon as I let off the gas to let it idle, it kinda chokes and dies. I took it around the neighborhood and at every stop sign it died. I would have to restart, in "N", keep a little gas on it and then put it into "D" to keep it running. It runs great when you are moving but as soon as you have to let off the gas to stop, it dies. I almost didn't make it home. Also, when revving, I can hear a light rattle from the exhaust. I was told by an ex-mechanic friend, that it could be that the exhaust has collapsed somewhere, possibly the muffler, creating to much backpressure. I trust his expertise, but was wanting some more opinions.

I feel kinda guilty, only because it started doing this while I was washing and waxing it. While doing so I cleaned the engine bay with simple green and wiped it down. Is it possible that some moisture got into the system and caused this? If so, I will feel even worse. Then again it could have been pure coinsidence that it did this while I was cleaning it.

let me know what ya'll think. Thanks .

Chris

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Old 09-19-2003, 03:47 PM
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Well, if the exhaust was plugged, it would probably idle but not go.

As far as washing it, its possible that some water got in one of the sensors or connectors and messed things up. If you can, find someone who can scan it for you, it'll save lots of time and usually pinpoint the problem.
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