Question about 2001 GMC Yukon Denali

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Why would my idle surge when ac is on and car is in drive

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Most likely is the idle air control not doing it`s job,replacement of the idle air control will most likely solve the problem.

Posted on Jul 15, 2010

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Posted on Jan 02, 2017

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1 Answer

Location of . idle control valve in mazda6 3.0 2004 e 3.0


Do this procedure first before replacing the expensive IAC valve.

Here are the most common causes of idle surge, 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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1 Answer

Surging


Hi billberger2

When the air conditioner turns on, the car computer also increases the engines revs to counter the load of the air con. It should not generally be noticeable however. Will do some research to see why. :)

regards
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2 Answers

Sudden power surge -happens in stop and start traffic. Foot on brake when power surge happens-I had to slam on brakes to prevent read end collosion. Three events in last two weeks.


Just my opinion, I wouldn't drive till you get it looked at, that sounds dangerous.
How long since a tune-up?
Any applicable trouble codes?
Sounds like something is telling the computer to up the idle, at the moment, I don't know why? Are you running the ac when this happens?
Check and clean throttle-body and anything that has to do with idle air system. Also, check the maf sensor, where applicable.

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1 Answer

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2006 Chevy Impala LS 3.5L Surge Under Load - YouTube

? 3:09
www.youtube.com/watch?v=sD-swFhMORM
Jan 22, 2013 - Uploaded by Gary Castle, Jr
Surge while driving. ... 2006 Chevy Impala LS 3.5L Surge Under Load ... How To Fix Or Prevent Stalling, Surging Or Rough Idle, Cleaning ...

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1 Answer

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Bad throttle position sensor.

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1 Answer

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check throttle body and check for codes

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1 Answer

At idle engine surges when in gear .if i dont leave the ac on car will most likely stall but when driving it runs great


check for vacuum line leaks , also remove and clean the idle air control motor and clean its hole if problem persists,get the ecm checked it could very well be bad injector drivers.

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1 Answer

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Have you install a timing belt recently? If you get it off a tooth it will idle high and surge

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ck the coolant level if this is ok then its the idle air control valve

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