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High Idle - Not IAC - What ?? 700 1991

posted by  Lummer57 on  Sun Aug 1 05:21 CST 2010
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last visit: Thu Oct 28 03:22 CST 2010
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Hello. Just bought a 1991 Volvo 740 auto with 156,000 miles. Regina system. Problem is it idles way too high(about 2000rpm). No vacuum/air leaks. I triple checked. Thinking problem was IAC(idle air control)(#1389557) valve I swapped in a known good one. No difference. Still idled too high. I unplugged the connection to IAC and now all is fine(about 700rpm idle). Questions : Can I just leave it unplugged ? What would be downside of doing so ? Too rich ? Poor mileage ? What would be causing "signal" to IAC to make it open and thus idle too high ? What should I check(maybe replace)next ?? Thanks.
--
' 88 740GLE auto wagon nearly 202,000 and ' 87 240DL auto sedan nearly 135,000






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New High Idle - Not IAC - What ?? [700][1991]
posted by  Lummer57  on Sun Aug 1 05:21 CST 2010 >


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