Hi All!
I have an '85 GL turbo that I just got running after a loooong (14yr) rest . . . Runs great, passed emissions just fine, but it has a stubborn miss at idle. I have replaced _all_ of the fuel hardware; gas tank, fuel pump, injectors, injector rail (whatever ya call it), pressure regulator, filter, etc. (Had to; worst case of "varnish" I've ever seen . . .) Also replaced the plugs, plug wires, cap, and rotor. As such, I have had the engine down to basically a long block and back; The intake plumbing is intact and tightened, and all of the vacuum lines are good, and presumably in the correct locations. But the roughness at idle remains. The emissions tech (surprised that it passed) said that he thought it was a "lean mis-fire", caused by the ECU trying to minimize CO (O2) readings at the oxygen sensor. While I've never heard of this before, it seems at least possible; certainly it gets _worse_ as the engine warms, which would seem consistent with his diagnosis. BTW, this car has an automatic tranny. I have another EA82T car (MT) that doesn't have the rough idle issue, and am planning on swapping parts in an effort to isolate the problem. Before I do, tho, I thought I'd ask to see if anyone in the group has experienced this sort of problem, and if there is an easy fix. Any thoughts on this greatly appreciated. TIA!
PS: The AT car only has 67,000 miles on it. 4sale if anyone's interested; $1000, $1200 after I (hopefully) fix the idle and replace the windshield. Very clean little car; the missus sez it has to go :-(
ByeBye! S.
Steve Jernigan KG0MB Laboratory Manager Microelectronics Research University of Colorado (719) 262-3101