Edited by ettev, 09 September 2012 - 08:21 PM.
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Idle Circuit Malfunction - 2000 RS
Posted 09 September 2012 - 08:07 PM
Posted 09 September 2012 - 11:06 PM
All of the manual transmissions have a switch on the side that reports to the ECU when the trans is in gear or neutral. It's actuated by the shift rod inside the trans as it moves forward or back. Very simple, two wires, its either in gear or it's not, and it has NOTHING in common with the inhibitor switch found on the automagics. (don't get 'em confused) Also has NOTHING to do with the Neutral Safety Switch under the clutch pedal.
The ECU uses this switch to determine fuel ratio and set idle speed. Basically, the ECU is trying to bring the engine back to idle RPM after you take your foot off the throttle, but because the trans is in gear while you're coasting it can't. The RPM is high and the ECU sees this as a fault with the idle control.
Find a wiring diagram and ECU I/O pinout for that model, check first if the P/O even connected the wires, and then check that they're in the correct places.
The NPS is on the drivers side of the transmission at the back near the tail housing where the shift rod enters the case.
Posted 10 September 2012 - 09:36 AM
Posted 11 September 2012 - 12:18 AM
I know the cone valve type that screws to the side of the throttle body is somewhat prone to failure, but tends to cause noticeable rough idle issues.
Another type bolts to the top of the throttle body and has a 3 sectioned O ring that can swell and degrade and cause problems. A new O ring is only a few $ from a dealer though.
Posted 11 September 2012 - 04:59 AM
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