Tubehead.ed Posted December 16, 2013 Share Posted December 16, 2013 I have a 1985 GL wagon, automatic tranny, 70,000 original miles with a rebuild about 8,000 miles ago. It starts up immediatly cold or hot. When cold it will initallly have an idle of about 1600rpm, and settle down within a short period to a 900-1,000rpm. Driving it locally and on the highway it is fine,has nice smooth acceleration . Once it has warmed up and I come to a stop, it typically will idle below 900. If i shut it off for a short period, restart it, the idle is around 500 and it begins a slow rough downward spirl until it dies. A mechanic looked at it and immediatly thought it was a valve,did a compression check and found the compression to range from 110 to 130 psi. The only other symptom I noticed was the distinct smell of oil on hot metal after I have driven it for 15+ minutes and shut the engine off. Suggestions as to what to look for? Thanks,Ed Quote Link to comment Share on other sites More sharing options...
naru Posted December 16, 2013 Share Posted December 16, 2013 (edited) Sounds like a plug fouls.Could be fuel or coolant. Does a good REV or two improve matters? I would start by inspecting the CTS connector for corrosion and the sender for resistance. Next,check fuel pressure to see if it drops after shutdown because of a leaky injector. See if you can identify a dead cylinder by pulling plug wires. Pull plugs after a short period to inspect for fuel and coolant. Make sure spark is as strong as w/cold. Since the problem only begins after a hot soak,I`m guessing it is not the usual unmetered air/vacuum leak from the rubber intake tract or rock hard PCV/vacuum hoses that the turbos suffer from. Worth checking anyway. Edited December 16, 2013 by naru Quote Link to comment Share on other sites More sharing options...
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