Question about 1992 Cadillac DeVille

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My 91 cadillac runs rough just on idle

Replaced plugs-wires-cap-all motor mts-cleaned injectors.runs and drives perfect but at idle in gear it is rough.can you help me?4.9 eng

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How many injecter are there in a 4.9 v8,and where are they located?

Posted on Jul 08, 2011

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If by rough you mean it sputters like it's idling too slow, it's most likely the TPS (throttle positioning switch) which controls both the cold and warm idle.
Could also be a MAP sensor. Run the diagnostics test on the car and retrieve the error codes to point you in the right direction. Go to the link below for information on retrieving the self diagnostics on your Caddy. Best of luck.
Greg
http://www.troublecodes.net/cadillac/cadbrom.shtml

Posted on Jun 28, 2009

  • Greg Margossian
    Greg Margossian Jul 02, 2009

    Kindly rate the solution provided if you feel it answered your question. Thanks very much.

    Greg

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This could be caused by one of many sensors as well. Some of which get pretty costly. The "idle air control valve" could be the culpret, but because these sensors get so expensive, I'd bring it to a shop and pay the $75 for them to run a diagnostic check.

Posted on Jun 28, 2009

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what you can do is
you can buy some injector cleaner and see if this helps
make Shaw you get a decent brand as the cheep ones do not work as good
drive around with this in your gas tank
when you have in in your gas tank it helps clean them if you do some harsh acceleration but don't race the motor and don't speed
in other words get to the speed limit fast
this will apply pressure and will push through any gunk build up
there may be some smoke for a while from the exhaust but is will go back to normal when the fuel injector has finished cleaning and all the build up is gone
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