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My 1994 Nissan Quest engine starts up properly and idles when cold. After the engine has been running for a while the idle is a little off every time I stop at a light or when it gets to about 1500 rpm. The needle goes up and down from 400rpm to 1500rpm. Sometimes it corrects itself and evenly idles at about 1000 rpm, however, sometimes it just bottoms out and shuts off. Funny thing is, it immediately starts back up. What is happening?

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Looks like you have a wire harness problem check your harness around the engine and see if there is any broken or making contact specially with the exhaust manifold also check you crank sensor and your fuel pump, because something is getting overheating.
Good luck.

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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  • 34 Answers

SOURCE: mitsubishi pajero io 1.8 GDI idle unstable

sounds like the cabbruter is losing pressure cheak tubes may be lose or damaged

Posted on Feb 24, 2009

emissionwiz
  • 76164 Answers

SOURCE: idle irratic

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

Posted on Apr 13, 2009

  • 6 Answers

SOURCE: High Idle

I have a 2001 Nissan Altima and mine did the same thing. We replaced the intake gasket. It costs around $5.50, but it requires several different kinds of tools. We spent over $100 in special sockets, etc. But once you replace that gasket, it will idle better.

Posted on May 14, 2009

  • 1348 Answers

SOURCE: 1993 Mazda Mx3 Revving high/Fluctuating during idle.

there is either a vacuum leak,or a valve on the throttle body called an iac that is bad. it is the idle air controller.alot of mazda have that problem

Posted on Oct 23, 2009

cansmo
  • 2431 Answers

SOURCE: idel problem on 5.7 1995 silverado

You engine is TBI, It uses a MAP sensor check the vacuum line for crack and make sure yo have a good seal, The distributor also check and make sure the pick up does not have corrosion which causes the relutor to stick. As for the EGR it would cause a misfire, and yes the do fail. I am sticking with the IAC as a problem its a stepper motor and has a high failure rate, chack also the ECT (engine coolant temp sensor) for corrosion that gives false reading.

Posted on Mar 05, 2012

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