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Rough idle, vacuum leak? - Cars & Trucks

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Could be.

Posted on Apr 14, 2015


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I have a 92 talon, has a rough idle when coasting and has low idle when still. I replaced plugs, wires, cleaned IAC valve, mass air flow sensor is good, cleaned the throttle body, added injector cleaner,...


Yes a vacuum leak could be the problem. Try filling a spray-bottle with tap water and spraying the vacuum lines and connections while the car is running.

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Sounds like possible vacuum leak. Next time it starts try spraying starting fluid around vacuum hoses, if engine speeds up, there is a vacuum leak at that point where you sprayed. Hope this helps.

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ZULFIQARDR HAS A TOYOTA CAMRY CAR, SOUND LIKE ROUGH IDLING COULD BE CAUSED BY WEAK FUEL PUMP,DIRTY FUEL INJECTORS, FOUL OUT SPARK PLUGS CAUSED BY LEAKING FUEL INJECTORS,LOW IDLE SPEED, CHECK IDLE SPEED CONTROL COULD BE TOO LOW ARE FAULTY LOOK FOR VACUUM LEAKS ON INTAKE MANIFOLD.BAD LEAKING ENGINE VALVES.

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I just got this blazer and noticed that it idles rough what could cause this?


idles rough but fine in a higher rpm. you might have a vacuum leak. to find a vacuum leak i use propane to pinpoint the orign of the leak. when the leak sucks in the propane the engle idle increases. thus you found your vacuum leak

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My 91 oldsmobile 98 runs rough in idle but when driving run smooth.


Rough idle is a very common problem on 4 cylinders, but I believe the 98 Regency has a 6 cylinder in it, right?

Sometimes the coil packs get iffy, and sometimes the EGR Valve gets a leak in it causing a rough idle.

When the accelerator pedal is depressed, it can change things so that the engine seems to run smoothly.

However, I would look for codes to see if anything intermittent is occurring in the engine that may need attention.

The OBD-I scanner can help to diagnose the problem, if anything is out of specifications on the engine in question.

The owner will have to find a technician that has such a scanner.

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REPLACED COIL PAC RUNS ROUGH


ROUGH IDLING CAN BE CAUSED BY VACUUM LEAKS.LIKE THE INTAKE MANIFOLD GASKET.OR VACUUM LEAKS FROM HOSES.LOW COMPRESSION CYLINDERS WITH BAD VALVES.LEAKING EGR VALVE GASKET.DIRTY CLOGGED FUEL INJECTORS WILL CAUSE ROUGH IDLING.

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Yes it could be a vacuum leak at the intake manifold, could also be the MAF sensor (especially if you use a gauze/oil air filter).

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rough idling can be caused by dirty air filter.dirty throttle valve and bore.vacuum leak at egr valve and pvc valve.also idling too low.will cause rough idling.

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check timing and set idle to 650rpm

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