Question about 1993 Toyota 4Runner

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Idles rough and rpm vary and almost dies - 1993 Toyota 4Runner

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If you are stopped and it's doing this, it'll most likely be the Idle Air Control Valve. If it does this while you are driving, it sounds like it's either not firing correctly or it may be a fuel issue - example - fuel pump, fuel filter, clogged injector, or just a little bad gas in your tank. Hope this helps.

Posted on May 22, 2011

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: idles rough

Check for engine vacuum leaks, most likely around the upper intake manifold arear, look for vacuum hoses that have come off or a missing vacuum port block off cap at the rear of the engine drivers side, large cap.

Posted on Nov 04, 2008

  • 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

ourhowse
  • 2007 Answers

SOURCE: rough idle, engine dies and rpm's flucuate when

Vacuum leaks. Leaking EGR or plugged PCV valve. Faulty idle control sensor.

Posted on Jun 15, 2009

  • 60 Answers

SOURCE: Rough/Low idle then dies.

is your check engine light on any longer ? also has your throttle plate ever been cleaned that can cause this symptom it will get build up on it and not allow correct idle ,you can clean it yourself ,rmove the big hose that goes up that goes up to your throttle body and get a can of deep creep sold at any parts house ,then spray the deep creep on a shop rag and by hand wipe out as much of the flap areas as you can ,its hard to get your fingers in there but be patient . but dont spray any thing down in the throttle throat it may cause more problems ,try the wipout of the throtlle area and see if it help your idle !

Posted on Aug 08, 2009

  • 1 Answer

SOURCE: 2003 nissan sentra se-r spec-v, started idle

i had a similar problem a few months ago with my se-r. i went to the dealership and had them reprogram the ecm and it fixed it(its on the recall list for your car.) once i did that everything ran great.

Posted on Aug 25, 2009

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92 NISSAN WITH BOGGING AT 2800 3500 RPM AND AT LEVEL SPEED 4CYL AND 5 SPEED


For this types of problem,there are few help inks to troubleshoot the problem.Click the link below to go through the troubleshooting procedure to resolve the issues :----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html
--------------runs lean and idles rough? http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html
-----------Car still runs Rough after tune up? http://howtobyme.blogspot.com/2011/12/car-still-runs-rough-after-tune-up.html
------------Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
----------High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
------------Engine Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html----------- Nissan stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm? http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.

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1 Answer

When first starting the car the service light comes on and then goes off after 5 minutes. When the car is idling the rpm's vary from 900-1000 and seems to have a slightly rough idle.


Deanna, have you checked for vacuum leaks yet? A simple leak can cause this. Check your air filter as well. Bad wires and plugs can also cause a rough idle. You need to catch your check engine light on and have your vehicle scanned for codes.

Oct 25, 2011 | Cars & Trucks

1 Answer

I have 2002 audit quattro TT with 180k miles. When I do a normal acceleration the car surges and rpm drop but pick back up. If I accel hard it runs fine. Also at idle at times it varies 200 rpm like a


this sounds similar to a problem i had. as the rpm went over 2000 the engine would stop for a split second and then kick back in.
after a few days looking my garage finally found the problem was a faulty air mass meter.
this cost me £200 in total to be repaired.

May 06, 2009 | 2002 Audi TT

1 Answer

Won't start, engine wont rev above 2000rpm


Have the alternator tested. You are providing a low charge to the battery when you jump it and when taking it above 2K RPM requires more amperage resulting in the engine dying and the rough idle

Apr 23, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Idle varies way too much


try replacing your map sensor or your throttle position sensor.

Nov 23, 2008 | 1990 Honda Civic

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BMW Z3 1,9 Litre Idle Problem when engine is warm


That RPM sounds a little low, did BMW comment?

Mar 19, 2017 | 1998 BMW Z3 Roadster

1 Answer

Engine will start and rough idle but dies when either the brakes are applied or the lights are turned on!


have you checked out your fuel filter? I had my 2003 denali do the same type of problem and it turned out to be a very dirty fuel filter.

Sep 02, 2008 | 1998 GMC Sierra

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