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Ask Your Question2002 Chevrolet Trailblazer
Question: rpm drops
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I HAVE TRAILBLAZER WITH 90,000. MILES ON IT. JUST STARTED WHEN GOING DOWN HIGHWAY THE RPM DROP AND FEELS LIKE CAR MIGHT STALL. EVEN THOUGH MY FOOT IS ON ACCERLATOR.. IT LAST ABOUTY FIVE TO TEN SECOND AND COMES BACK UP WHERE ITS SUPPOSE TO BE. ALSO WHEN THE RPMS DROP THE ABS LIGHT COMES ON... ANY ITEAS WHAT MAY BE CAUSING THIS?
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Answer #1
Bret Bodas January 16, 2010, 10:43Reply
MasterSounds like a possible fuel pump failing, but I would start by checking the fault codes in the engine control module, and check the fuel pressure.
You may have an issue with the ABS, but the light may be coming on due to low idle speed. Have you had any battery issues lately?Flag ThisLike | 1 person likes this1 -
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fufu, January 16, 2010, 11:23
Rookiehad the fuel pump replaced not to long ago... no battery problems.. do you think it could be the throttle? needs to be cleaned?
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Bret Bodas, January 16, 2010, 11:31MasterA dirty throttle will cause idling problems, so it doesn't sound like your issue. Do you have the check engine light on? Any other warning lights?
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fufu, January 16, 2010, 11:35Rookieyes the lights that says check engine will come on and off at times...
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fufu, January 16, 2010, 11:36Rookiethats the only warning light thats comes on.. except when the rpm drop and the abs light comes on for a few seconds
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fufu, January 16, 2010, 11:37Rookiethanks for your input.. on this i really appreciated it..
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Bret Bodas, January 16, 2010, 12:09MasterThe next step is to get the diagnostic information from the engine control module, when the check engine light comes on, this info is stored and is needed to help diagnose this problem.
If you can get the codes read out, and post them here I can give more info, you may be able to get this done for free at a parts store, just don't act on their recommendations.
Thanks you for visiting RepairPal and for your appreciation, it means a lot!Flag This -
Answer #2
ComputernerdBD February 24, 2010, 09:07Reply
RookieChange your fuel filter. That is probably what caused your first pump to fail. It will probably make your second pump fail as well if it clogs. Also try Lucas Upper Cylinder Lubricant to clean your fuel injectors.
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Answer #3
Visitor, October 27, 2010, 16:30Replypossibly your catalytic converter is plugged
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