Question about 2002 Chevrolet TrailBlazer

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The engine rpm surges and drops during idle and exceleration. Replaced fuel filter and the problem still happens.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

godspeed808
  • 125 Answers

SOURCE: olds alero 2.4 idle fuel pressure

most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.

Posted on Feb 26, 2009

emissionwiz
  • 75235 Answers

SOURCE: my car threatens to die during idling...the rpm

Here are the most common causes of surges, stalls at stops, low erratic idle speed, rough idle and engine hesitation, it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Mar 29, 2009

  • 14 Answers

SOURCE: 1992 gmc chevy 350 wont idle when warm

This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Posted on Apr 17, 2009

  • 12 Answers

SOURCE: Hesitation and slight rpm drop at idle and while driving.

it is possible there is a soft vacuum line. try looking behind the maf sensor [attached to the air filter box] on the right side near the plenom next to a blue connector. it's a small piece of hose that is looped from one vacuum circuit to another. I have found them to get very soft and **** air.

Posted on May 19, 2009

Testimonial: "The problem seems to be less consistent now. Guessing maybe there is still a vacuum leak somewhere else. Thanks for the tip :)"

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