Question about 2003 Cadillac Sts

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I have a 2003 cadi sts with the car in park if i rev it up at 4000 rpm's it starts to stall and eventually cuts off but starts with no problem then when i shift into drive the engine feels like its stumbbling. when i drive off acceleration seems sluggish then it accelerates fine stop and it starts to stumbble again any ideas ??

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  • crz_one69 May 16, 2011

    changed the fuel filter and the tsp sensor still now im getting a cpm code p0300 and check engine light that clears intermittntly

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I suspect that you need to change your inline fuel filter. This filter blocks junk from the tank and if the sediment builds up in the filter say about half way, it still allows some fuel to flow at low RPMs, but when it is reved, then the fuel pump pressure forces the sediment in the inline filter towards the outlet and blocks fuel flow. When the car sits for a few minutes, then the sediment settles back toward the bottom half and fuel at low pressure can flow again.

Posted on Mar 25, 2011

  • Norman Worley May 17, 2011

    Code P0300 from the GM PowerTrain Codes indicates "Engine misfires Detected" This code can be anything from a bad plug, bad coil, or as some folks say a blown head gasket. See: http://wiki.answers.com/Q/How_do_you_fix...
    The "Check engine light" comes on due to the computer seeing a oxygen air mixture in the exhaust not quite right. The O2 sensor or EGO mounted in the exhaust pipe, one up in the manifold and the other one below the "Y" may itself be bad as is found in most cases. It also could mean that the lousy fuel that we get today may be causing the sensor to misread the oxygen content in the exhaust mixture, especially upon starting in cold weather. It also could mean that the problems are due to a bad acting computer or ECU.

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Its sounds like a bad tps (throttle positioning Sensor) its located on the throttle body. usually pretty inexpensive and easy to replace.

Posted on Mar 25, 2011

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