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Idle rough runs

Runs great for 15 minutes than starts cutting out at low rpms

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EGR valve

Posted on Oct 17, 2013


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  • 38 Answers

Usually that happens when your coil is getting old and weak and starts missing spark when it warms up

Posted on Oct 16, 2013

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Tri3mast
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SOURCE: runs and starts fine but

First impression was why would anyone rev their motorcycle to 9 grand in neutral? I could see if you were in gear clutch pulled and ready for a "drag" or Race Start but in neutral?

Anyway I can't hear it so if the sound is like it hits 9k and starts popping then two things either an over rev limiter which I doubtr because the engine red lines at 13,500 OR you have a set of spark plugs breaking down under load

Posted on May 03, 2011

  • 2 Answers

SOURCE: idles good but bogs down at low speeds, once the

try and fold the air filter sponge and see if that works if no take the carb off and clean it or take it to the shop and have it tund up.

Posted on Jun 30, 2011

  • 1 Answer

SOURCE: 05 Bandit 1200S idles low, run rough at low rpms,

Try buying new diaframs for your carbs, because of the diafram and piston operation, if the diafram becomes weak due to heat from your engine, and by the diafram not beeing rigid enough, it hesitates to lift the needle out of the jet causing the lack of fuel at low tack/rpm when throttling up or accelerating slowly.

Posted on Jul 03, 2011

  • 123 Answers

SOURCE: low rough idle speed ,

Check for an air leak at either the exhaust manifold or the intake manifold. Backfiring on decceleration usually indicates a lean issue but can also be caused by a leaking exhaust gasket. Rough idle can be caused by an air leak as well. The easiest way to find a leak is to spray carburetor cleaner around the intake on the cylinder head. If the engine speed picks up you have found your issue. Also what are the modifications if any on this bike?

Posted on Aug 03, 2011

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1 Answer

1992 dodge dynasty cuts out when i give it gas. runs fine for a few minutes and idles fine


I would start by checking the catalitc converter when these clogg the moter cant push out enough air for it to climb rpms but it will run fin at low rpms... Also as they heat up the metal expands closeing them off even more.

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05 Bandit 1200S idles low, run rough at low rpms,


Try buying new diaframs for your carbs, because of the diafram and piston operation, if the diafram becomes weak due to heat from your engine, and by the diafram not beeing rigid enough, it hesitates to lift the needle out of the jet causing the lack of fuel at low tack/rpm when throttling up or accelerating slowly.

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Car runs great 45 minutes into ride it idles rough and stalls like bad gas or water. wait 15 minutes car starts runs 15 minutes stalls the same way.


It could be any number of things check your catalatic converter. Is the check motor light on? email me at mallanapril@msn.com with any other questions

Apr 07, 2010 | 2000 Suzuki Grand Vitara

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93 Lincoln Conti. Runs rough in gear


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Trouble with my rpms


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.

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Engine runs rough after about ten minutes /idles really low


Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.

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"99 cherokee classic: sputtering when cold


I had the same problem with my 99 Cherokee. I was told to replace the blower motor for the carburetor, works great and gas mileage improved.

Jul 16, 2008 | 1999 Jeep Cherokee

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