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Originally Posted by Aurora40
I would think the high idle is more likely caused by a leak somewhere than by an improper TPS. But I could be wrong. I'm not sure how a high-reading TPS could actually cause the motor to run much faster since it needs air to do that.
Did you clean the throttle body when you replaced the IAC?
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I haven't clened the throttle body other than spraying the IAC hole with cleaner like crazy when I replaced it.
I replaced the TPS....the original was set to .34 but it was probably good. Checked for vaccum leaks and could not find any.
Got a QDM1 fault YES on the scanner. Noticed a hard to reach throttle cable stop but I don't want to mess with it.
Wierd thing is the speedometer is always reading 60mph to 220mph.
New TPS set to .54 did not fix the problem. I drove for 1 hr and idle suddenly came back to about 650 where it is supposed to be but I expect it to be high again when I start engine today. Real mystery. Hope I don't have to change the ecm.
hpb