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What causes rough idle when car is in gear at stop

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If this is a 4 banger, my friend had a this problem. This can sometimes be caused by the rubber motor mount has deteriorated. Also if the idle speed is low it will cause vibration. And for a final cure my car pool buddy's truck had a burnt valve, bummer.

Posted on May 15, 2014

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Posted on Jan 02, 2017

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  • 496 Answers

SOURCE: 87 Supra idles rough and dies out

I would suspect a vacuum leak. At idle under high vacuum the air fuel mix is being leaned out until you have misfiring so bad the engine quits. The exhaust smells rich because even a lean mixture, if it doesn't light off, if full of unburned fuel. At road speeds, the vacuum is low so the engine doesn't care if there is a small leak somewhere. It is getting most of its air through the open throttle. Check all your vacuum lines but remember that even if every line is okay, it could still be leaking from an old cracked intake manifold gasket.

Posted on Jan 28, 2009

greg_margo
  • 1959 Answers

SOURCE: when a/c is turned on idles rough and rpms drop

It's possibly the TPS (Throttle Position Sensor). The TPS controls the throttle in different conditions i.e. cold,warm, AC operation. It could be the TPS isn't idling fast enough when you operate the AC.

Posted on Jun 30, 2009

  • 583 Answers

SOURCE: Rough low idle in gear when stopped at a light.

probable vacuum leak query brake booster

Posted on Jul 26, 2009

MNfisherman
  • 11896 Answers

SOURCE: 97 galant low idle in park or in gear at stop

double check your vacuum hoses, fuel filter, plugs and wires and air filter.

Posted on Jul 29, 2009

SOURCE: I have intermittent rough idle

Replace the spark plugs, spark plug wires, distributor cap, and rotor. Next, check the idle air control valve and replace it if found faulty. If it still shakes, have the timing checked out

Posted on Jul 01, 2010

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1 Answer

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Could be a bad vacuum leak (a vacuum leak would cause a rough idle or high idle). Or the TCC solenoid is stuck on. Have the codes read.

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My car dies when i put it in gear or when i come to a stop and a rough idle i changed the tps


Idle air control valve would be my next bet , the TPS usually just makes it rough on acceleration. Is it rough on acceleration(loss of power) ?

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Rough low idle in gear when stopped at a light.


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When a/c is turned on idles rough and rpms drop put in neutral and idles fine in gear rough idle when you come to stop already changed egr valve not the problem


See if the idle control is working. I have a protegee that does the same thing, although the cause of mine is diffrent, it is the torque converter clutch not disengaging when stopped. Read the code, and see if there are any. Auto Zone will read it for free and give you a print out.

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