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914World.com _ 914World Garage _ Still hunting at idle

Posted by: ChrisReale Feb 20 2003, 10:46 PM

I just had my valves adjusted. I have all correct 1973 2.0L ECU, MPS, CHT and ballast resistor. The mechanic did an exhaust analysis, and it is running 3% (not rich, but not lean...??) I still have a hunt at idle. Only bounces between like 900 and 1200 rpm, but its driving me crazy. I have checked for vacuum leaks, and found none. Wierd thing is, I have two ECU's and both have shown no change in rich/lean when the pot is turned (on the Co.analyzer). Is this a wiring harness problem? It seems to be getting beyond my knowledge of troubleshooting

Posted by: Jeffs9146 Feb 20 2003, 11:25 PM

I have no idea if this will help but mine was doing that before i found out the head temp sensor was stripped out. Eventualy it lost so much contact that it would die when warmed up.

Good luck

Jeff

Posted by: AZ914 Feb 21 2003, 12:16 PM

Chris/Jeff,

Mine is doing the same. Either hunts up and down, or just barely idles, no matter where I have the idle screw adjusted, or the mixture nob on the ECU. NOW, when cold, it idles just fine. I can tune the idle adjuster to the proper RPM but once warm, it barely idles.
Jeff, thanks for the tip on the CYL HEAD TEMP wire. I'll check it.

Posted by: Jeffs9146 Feb 21 2003, 01:23 PM

In addition to checking the wire, check the threds holding the sensor to the head.

Jeff

Posted by: ChrisReale Feb 25 2003, 07:12 PM

Finally go tthis beast fixed. It was a combination of the throttle switch, the idle screw and the ECU knob. It idles a bit high right now, a touch abouve 1000 rpms, but I think that will work for now

Posted by: Van914 Feb 25 2003, 07:57 PM

Try adjusting the Aux Air Device. It is the one with the small hose on a threaded barb. You can adjust it in or out and it does help.

Van

Posted by: Dave_Darling Feb 25 2003, 08:02 PM

Van, it sounds like you're describing the Decel Valve. Adjusting that shouldn't help if the valve is functioning correctly... The AAR is not adjustable.

Chris, it's probably a vacuum leak. Smaller possibility that it's the timing.

--DD