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945T idle / acceleration hesitations 900 1993

posted by  olyh01 on  Wed Jun 22 02:41 CST 2005
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last visit: Fri Jul 12 09:22 CST 2013
[RELATED]

After the engine warms to normal temperature, while in D and idling, the engine frequently bogs down to around 400 RPM and recovers for a few seceonds then repeats. Put in Neutral then the problem is almost completely gone. Right after such bogging acceleration is very sluggish as if it's missing a cylinder or two. Normal driving at low or high speed seems normal. Highway gas mileages is around 23 MPG.

I used Sea Foam Deep Creep without any improvement. Then I used FI TB cleaner. I removed TB and IAC and thoroughly cleaned them. TB has light buildup but the IAC was fairly clean. The IAC rotating valve turns smoothly. After cleaning with FI TB cleaner there is some slight improvement. I did notice the idle set screw is completely turned in. Diagnostic code is 1-1-1. Idle speed in Neutral is around 700 RPM.

Q1. Any suggestions as to what to check / suspect next?
Q2. Also, is it possible to test IAC operation? If so how do I do that?

Much TIA,
Lih-Yen






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