engine idling is out of timing...revs up to 3000rpm and then drops to 1750rpm then back to 3000 again...

Joseph Anthony Gahol

Asked by Joseph Anthony Dec 06, 2011 at 05:58 AM about the 1996 Honda Civic DX

Question type: Maintenance & Repair

my revs are not in sync...the idle rev rises and drops...when AC's on, it stays on 2500rpm...and when i engage to Drive (AT
gearbox), it stays on the 1500rpm idle...i checked the block and the crankshaft is okay and everything is in place...what could it
be? probabilities:
a.) clogged intake manifold
b.) defective air sensor
c.) lose-thread pistons and crankshaft
d.) loose timing belt

when in cruising speed with AC it seems to run fine but when AC's off and i reach about 140-160mph, the engine shakes and idle
is crazy...

2 Answers

Joseph Anthony Gahol


Takoda Fraser

try checking your idle air control valve they get clogged and stick and it will cause all sorts of funky idling issues

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