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if recently did tune up check firing order for misfire on wires..check oxygen sensors or throttle position sensor..also possibly idle air control sensor
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∙ 14y ago
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What causes a Briggs and stratton engine idle speed go up and down?
The most common cause of engine surging (rev up and down) is a dirty air filter.
Why does the air conditioner cause the engine to rev up?
air conditioning compressors put a load on the engine causing it to slow down, vehicles have an idle compensator which when the air conditioning is on speeds the engine back up to normal idle speed or" compensates" for the added load.
Is it normal for a 2003 gallant to rev up slightly when you turn the wheel?
Yes the power steering takes power from the engine if it did not rev up it would make the vehicle shut off due to low idle.
Why Car engine shake when AC is on at idle?
The engine idle may be set to low to compensate for the AC compressor starting up. Rev the engine a few times to see if it stops. If it doesn't, there may be a problem with the AC temperature signal or motor mount.
On a 1994 Buick Lasabre Why does the engine continue to rev up while driving even when brake is applied?
On a 1994 Buick LaSabre why does the engine continue to rev up while driving even when the brake is applied ? or when driving why doesn't the engine return to idle when the brake is applied? I would check for a vacuum leak
What is wrong when your car sputters at idle and when you rev up engine it sputters then kicks in and fuel comes out tailpipe?
need to check your evap system or you have a blown head
Why a good shape 5.0L engine in a 89 c vic idle RPM rev up and down in short cycles when air conditioning is turned on until engine dies?
Throttle positioning sensor
What purpose is the idle speed control value on 1990 Chevrolet 1500 pickup and what does it look like and where is it located at?
The purpose is to control the idle speed, so that you don't idle too high or too low. Look under the engine... you'll see a sort of semicircular piece with a cable attached to it. With the engine running, if you turn that piece, the engine will rev up.
Why does your 1996 Lincoln Mark 8 LSC over rev?
May be your IAC valve (idle air control) they get dirty inside and make your idle act up. Back of the engine toward the passenger side, two bolts and hard to get at.
Why would a 1996 sebring stall and rev up in idle?
intake gasket is leaking
Why would a wrangler idle high after warming up?
check your Idle sensor which is attached to your throttle body. This ussually goes bad and tends to rev the idle up. I had the same problem with my 99 wrangler.
1997 sunfireMissing when idle and wont rev up?
what type of motor is it? the quad 4 or the 2.2
