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RPMs fluctuate when idling

Old 02-13-2007, 04:58 PM
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Join Date: Feb 2006
Location: Montana
Posts: 6,290
Default RE: RPMs fluctuate when idling

it sounds like a "mechanic" that's used to working on old chevy's.... Get some carb cleaner and clean out the throttle body, IACV (intake air contorl valve) and possibly the EGR valve.... Also, since you stole that car at $900.00 make sure that basic maintenance has been done, plugs (NGK only), Wires, Cap, Rotor, TIMING BELT, WATER PUMP, SEALS.... if the three bold items haven't been done then make it happen, those are VERY important to that motor... congrats on stealing a car! *L* Welcome to the forum
Old 02-13-2007, 06:22 PM
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Join Date: Apr 2006
Posts: 346
Default RE: RPMs fluctuate when idling

could be many things... go to a independant shop and find the oldest fart there... ask him if he has a scope... if he does see if he will check ur sensors...

it could be a O2 sensor, TPS, MAF sensor... alot of things
Old 02-13-2007, 10:55 PM
Join Date: Sep 2006
Posts: 141
Default RE: RPMs fluctuate when idling

My guess is that the car is still cold... once it warms up it won't do that...
Old 02-14-2007, 03:32 PM
deserthonda's Avatar
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Default RE: RPMs fluctuate when idling

chk for a vacc leak, chk to make sure that radiator is fiull of coolant, remove the top lid on the fast idle valve and screw in the inner valve, it has slots on the side use a screwdriver and turn it in
Old 02-14-2007, 03:50 PM
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Join Date: Apr 2006
Posts: 346
Default RE: RPMs fluctuate when idling

i talked to my teacher... spray carb cleaner around ur throttle body while its running... if it smooths out u have a vacume leak... (dont spray to much carb cleaner because it is flameable) the teacher described a condition called hunting... spray the TB and see what happens...
Old 02-14-2007, 05:36 PM
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Join Date: May 2006
Location: Wisconsin
Posts: 17,514
Default RE: RPMs fluctuate when idling

ORIGINAL: jmeeter

I spoke to a "mechanic" at Wal*Mart when I was there grabbing floormats, and he said it sounded like the Mass Air Flow Sensor was out of wack. Does this sound accurate, and how much am I looking at to get it repaired?
The best part of this thread is knowing that your car doesn't even have an air mass flow sensor.

Otherwise, the other guys have given good suggestions for you to check.
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