90 Sidekick 1590cc with new valve job at 125000 miles. On cold start, idles at 2500+ for several minutes then gradually idles down to about 1000 (acceptable) after about 5 minutes. The manifold vacuum operated dashpot has been adjusted to not cause high idle, IAC bench tested & cleaned, no vacuum leaks (pulls 17-19" at warm idle), and 5v reference volts at connector.
I don't have the shop manual, nor know how to pull codes on this car.
There are 2 electric/vacuum switches (red-manifold; blue-ported) mounted on front side of valve cover. Appears ported vacuum operates the EGR, whereas manifold vacuum is the dashpot on side of Throttle Body (decelleration?)
Confirm I re-connected the vacuum lines correctly and explain function if I have it wrong.
I don't believe the IAC is adjustable, so I can't determine cause of abnormally high cold idle.
I'm new to you, but am happy to make a donation if you can help me solve this issue without buying the shop manual.
have the same problem?
Saturday, July 28th, 2007 AT 7:17 PM