Question about 2003 Chevrolet Impala

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Check engine light on car engine jumping and driving hard.

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Go to an Autozone, Checker, Shucks, Kragen, O'Reilly, or a NAPA auto parts store and ask them to use their code reader to find out what the trouble codes are causing your check engine light to come on. They will do this for no charge. Report back here once you know what the codes are.

Posted on Apr 07, 2010

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Get the code, My Expedition did this exact thing yesterday. My code reader said #8 misfire. Replaced coil on the cylinder. Swapped coils and plugs with other cylinders. The misfire followed the coil. If the misfire stayed on the same cylinder then most likely you have a injector issue or intake vacuum leak. I fix cars for a living at his is a backyard mechanic diagnoses without needing any special tools

Posted on Nov 19, 2009

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Posted on Jan 02, 2017

Murphybanton
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SOURCE: check engine light comes on and car starts to downshift hard

Please take the car for a scan to reveal any problem/ error codes causing this.

Good luck,

Posted on Jul 15, 2009

JULIANFIX
  • 975 Answers

SOURCE: check engine light

have your car SCAN , IT COULD BE A DEFECTIVE SENSOR , around the THROTTLE BODY , HOPE IT HELPS , aj

Posted on May 12, 2009

  • 336 Answers

SOURCE: My check engine light is on. My car jumps when

First you need to have it scanned for fault codes. Thats what causes the check engine light to illuminate. Without these codes any diagnoses is speculation. You can have the system scanned at most any auto parts store for free. Auto zone, checkers, Napa, and Murray's will do this for you. Bring the codes back here and we will have a better understanding of whats causing this.

Posted on Jun 13, 2010

RaidX
  • 632 Answers

SOURCE: ABS and Check Engine Lights on

This could be the case, Car computers don't like being started other than how it was suppose to be started, You will need an error code reader just to confirm there are no problems with the engine then you can clear any stored error codes which will turn off any lights you have on.

Posted on Jul 21, 2010

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