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Idle speed too low at stop

Idle too slow at stop

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  • DFARLEY Apr 03, 2015

    Hi Richard Gorenflo, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?

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Is it not a stop-and-go engine design that is supposed to stop? Too low to run the accessories and keep running? Many things are probably off, and a tuneup to get all the sensors. belts, exhaust performance, breather valve etc. working in unison is called for, but perhaps a loop on the interstate (plus pre-cleaning it yourself with a rag, having gotten to it via 2 screws) could help clean up the EGR sensor and get it cheered up until the next garage appointment you can make. Another classic reason is that the idle rate thumbscrew got played with, or a hole in the exhaust.

Posted on Apr 03, 2015

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Hi Rich what make model an year vehicle ? Most vehicles have a IAC valve or motor - idle air control , There is a passage in the throttle body an this valve opens an closes this passage allowing more air past the throttle plate raising the idle ! This passage gets plugged by carbon an needs cleaning to restore the idle back ! Idle Air Control Valve How to clean throttle body and Idle air control valve iac There is no means for idle adjustment , the engine PCM controls It !

Posted on Apr 03, 2015

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1 Answer

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Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), 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.

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the idle speed is computer controlled and not adjustable, slow idle is caused by a dirty intake, do the following.

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2 Answers

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