neohic Posted June 5, 2011 Posted June 5, 2011 My friend has an '87 XJ, 4.0L, auto., and it idles right around 1200 RPM. He's changed the IAC about a year ago, TPS recently, coolant sensor, intake and exhaust manifold gaskets, and checked over all of the vacuum lines. The problem gets a little worse when it's at running temp. Any ideas from the pros? Thanks, dudes!
philbert001 Posted June 5, 2011 Posted June 5, 2011 I would say triple check those vacuum lines. That'll mess with idle!
neohic Posted June 6, 2011 Author Posted June 6, 2011 Hmm... so, on his '87, there is a screw on the side of the throttle body that is right above the EGR. On my '88, it is plugged with a rivet. It came down to it that the screw was backed out slightly and he tightened it back in... fixed the problem. :dunno:
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