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2500 rpm missfire - Hyundai Motor 2002 Sonata

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Missfire problem with spark plugs,coils,wires.

Posted on May 04, 2013


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Missing fire on a cylinder how to diagnose which one ?

With a scan tool the ECU should tell you what cylinders are registering missfires. Easiest way to tell what cylinder is not firing is with a laser pyometer. You can point it at the exhaust manifold at each cylinder and find what ones are cool. Also I would suggest looking for a vacuum leak after the mass meter. Either in the air inlet pipe or around the intake manifold.

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'99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

which car is it?

problem with 1993 Geo Prizm '99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

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HC reading of 400 @ 2500 rpm. New catalitic converter.

high hc means uunburned fuel exiting the engine, usual suspects is missfire, leaking injector, bad cat, o2 sensor, map sensor, vavuum leak, best to have it scanned

Apr 26, 2011 | Chevrolet Astro Cars & Trucks

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1998 chevy 5.7 wouldn't start or even try to fire. Ended up buying new plugs, that made it try but ended up haveing to remove all the plugs , turned the motor over 8-9 times let it sit awhile did it again...

Check the timing and also test the wires for the proper amount of resistance. Fuel pressure should be checked also. Fuel, Air, Spark, Timing must all be correct.

Jan 14, 2011 | Chevrolet Silverado 1500 Cars & Trucks

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I can get high RPM but no power, especially at takeoff, feels "jerky"

sounds like a missfire. You will need to see a mechanic so he can check the missfire counter and see if this is the case!

Oct 04, 2009 | 2002 Chevrolet Malibu

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BMW 523i 1999 model

your car is not suppose to idle at 500 rpm . 800 to 950 is the proper idle, unfortunately it is controlled by the computer. have you checked the idle speed control valve? also check the air flow meter

May 28, 2009 | 2001 BMW 5 Series

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2006 Dodge Ram 2500 5.7 Litre Hemi

missfire are often caused by a fault on either of the spark plugs, one may already been damaged!

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Rpm is going up and down at high "2000"

It means your transmission is slipping, that happens in a lot of mercury mystiques.

Jun 02, 2008 | 1997 Hyundai Accent

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