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High Idle - Not IAC?? 700 1991

Thanks for your reply Bruce / Lucid. Per Wiglaf's reply yesterday it appears ECT sensor did have effect on IAC or maybe his replacing it was co-incidence with him inadvertantly fixing it by doing something otherwise while replacing it. If I can avoid replacing ECT sensor I would be happy as it appears to be a real pain to get to. I did block off hose from near airbox going to the IAC and yes indeed that slowed down high idle. Although I checked TP switch adjustment already and it was ok I will do that again just to be sure. Switch in it clicks but I guess that does not necessarilly mean it is working ok ? Connection to TP switch is secure & proper. Will again check that too. Wish I had a known good TP switch then I could just replace mine to see if it is the culprit/problem. Thanks for all your thoughtful advice. Much appreciated.

P.S. - Problem with OBD procedure is with me. I just can't seem to be able to read that little blinking light right. Tells me different info each time I do it. Wish it were a solid stable readout. Oh well. From what I read it was in it's infancy back in 1991.
--
' 88 740GLE auto wagon nearly 202,000 and ' 87 240DL auto sedan nearly 135,000






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