Bad IAC?

[shofun]

Will a bad IAC cause bad gas mileage.
I have a rough idle and sometimes a high idle like the valve is sticking. Also sometimes the idle will jump from 14-15 back and forth when I push the clutch in and when I completly stop, the idle will go up to about 1800 rpms. Any other ideas.

Rowley

 

[sdpatt]

Those are very high idle speeds. The oscillating idle is usually the result of a dirty/bad IAC valve, but can also be complicated by a throttle position sensor with a dead spot or fluctuating signal at idle.

Have you reset the idle program after having the battery disconected?

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Scott

1991, 254K miles, glass hood, police grill, SVO shifter, Catz fogs,
K&N, 73mm MAF, Superchip, PP Y-pipe, Borla cat-back, 190 lph pump
Eibach/Tokico/polyurethane, SHO Shop front & rear strut braces,
16x7.5" Moda R1, 225/55ZR16 Bridgestone RE730, -1 deg camber x 4,
6 disc CD, Class II hitch, Silver award at SHOklahoma Car Show

[This message has been edited by sdpatt (edited 01-18-2002).]