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Idle fluctuations (I am stumped)
Posted by Emil '92 900 (more from Emil '92 900) on Fri, 18 Oct 2002 02:45:24
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Here the problem. When the car is idling at a stoplight. There are some small jumps in the idle from normal 900-ish to sudden 1200-1300 and back.... this happens intermittent and once every 5 sec or so. Also it sometimes sticks to 1200 when I am braking and putting in the clutch.
I know it is running a wee bit on the rich side.
So far this is what I have done.
vaccuum leaks over and over again, took of and plugged the elcd for 2 weeks no luck.
Replaced O2 5k ago;
New wires, plugs, cap, rotor
Swapped in known good, AMM, AIC, ECU to no avail.
Replaced NTC, Throttle switch, because I noticed when I unplug the connector on the throttle switch the idle is rock-steady. After replacing the switch it was fine for a couple of days now it is back where it started. Readjusted the throttle close postion according this site info.
I am really running out of ideas now?
Could it be an exhaust manifold leak causing the rich running and disturbing the idle mixture? When I am driving all is OK no sudden jumps in rpm. And how do I find a leak, don't hear any puff puff sounds.
Please some help......
Emil
posted by 134.188.15...
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