Toymods Car Club Inc: Tech & Conversions => AFM 4AG idle problem (long)

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Ben Wilson
Forums Junkie

Location:
Canberra
Registered:
May 2002

AFM 4AG idle problem (long)	Sun, 09 June 2002 09:38

For those that don't know, ever since I did my SC conversion, I've had an idle problem. Today I decided to track down and find the problem. No luck.. The idle continually bounces over about a 1000 RPM range around once a second. It's bad when it's cold, then seems to get a little better, but, it's never spot on. When it's just about at normal operating temperature, the downward dip in the idle is low enough that it will stall. I've checked for vacuum leaks - None. I've checked the timing - It's spot on. I've set the TPS according to the BGB. I've tried it with and without coolant running to the TB - No difference. I've replaced the vacuum lines around the ABV - Seemed to help a bit, but, no real improvement. I've checked the Idle motor - It come in within spec. I've tried another idle motor - No change. I've replaced the ABV - No difference. I've blanked off the ABV - No difference. I've blanked off the idle controll motor - This was interesting, the throttle was really initially sluggish, then suddenly the motor would jump to around 2000, it was really hard not to get it bouncing. Obviously the idle motor is doing a pretty good job. This was what led me to start looking at the ABV, I thought it might be sticking shut then suddenly opening - Apparently not.. I've fiddled the mixture screw on the AFM and checked the AFM, it all seems to work OK. I've tried it with every vacuum hose I could get my hands on disconnected, with the supercharger unplugged, even with the idle motor unplugged. There were some differences, but, generally, it seems to have the same underlying problem. I'm starting to run out of options here - I've got a Haltech, but, I'd really like to get it running with the factory computer for as long as I can. Sorry about the length, I just wanted to make sure I've covered everything. Has anyone got any suggestions? Even any more avenues to explore? [Report message to a moderator]

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