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#1 |
Join Date: Dec 2008
Location: Sutton UK
Posts: 21
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Not sure if anyone's encountered this before but my LT5 has started idling rather highly at odd times.
I start it cold, no worries idles a touch fast (naturally) then settles down to a steady 1000rpm. If I go for a fast drive, sometimes it's okay, other times it'll keep reving at 1800-2000rpm and just surges up and down. Doesn't happen all the time though and when it is happening, if I pull up to a complete stop it calms itself down after about 30-60 seconds. I replaced the Idle Valve control unit (little black thing hanging off the side of the air intake chamber) a few weeks back, perhaps it's something to do with the ECU calibrating the new sensor?? Any ideas?? |
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#2 |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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It has the ear marks of a "vacuum" (air) leak. In my case it was the intake and IH that needed to be re-torqued. Some of the bolts were barley finger tight. Also, on my 90 there was a vacuum line running to the TB on the underside. It discovered that it was left disconnected when I bought it. That caused me some erratic idle once as well.
Others will chime in too. P. |
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