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

Joseph Gahol
1,055

Asked by Joseph 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 Gahol
1,055

B!!!

Takoda Fraser
835

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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