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Idle air control valve or computer ?? (archive)

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Posted by Mike on April 24, 2002 at 08:04:06:

The last couple of days the idle on cold start is very slow +550 rpm close to dieing. When warm it at the usual 975 RPM. I cleaned the IAC but it was clean and the change did not help. In an older post I read about the driver transistors in the computer going bad. How do I check for that ? Also checked the temp sensor but is ok too.
Any other ideas ??

Mike (Germany)
89 M3
95 525 TDS
68 GT500
65 Mustang conv.

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