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Old 03-09-2017, 01:55 AM   #1
jordy
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Join Date: Mar 2016
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Default rough idle


my 1992 sl2 started idling rough so I did a compression test dry and wet. Results are #4 185-210 #3 90-125 #2 185-210 #1 190-210. i did get a 45 code when It started idling bad. Runs fine at higher rpm. The engine was just a little warm.I already started taking apart so I can no longer test again. miles are almost all highway not sure how many but I can do the math(75 mile road trip for a number of years) and it is pushing 300,000. I would like to keep it alive a few more years.(50,000 would be nice) Any thoughts?

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Old 03-15-2017, 11:29 AM   #2
derfderf
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Location: Out on the Tiles
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Default

Congrats on somehow getting a DOHC motor from 92 to that kind iof mileage, though from the compression readings I suspect it has been rebuilt. Anyway '\

Code 45 is System running rich.
Replace coolant temp sensor (2 wire) w GM sourced all brass ECTS and replace pigtail connector.

Worn out contaminated 02 sensor will read artificially low, thereby commanding more fuel than actually needed since it isn't reading all the oxygen. If DTS doesn't fix it repl O2 w denso equivalent of AC delco sensor

Re reing, valve job, valve guide seals

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Originally Posted by jordy View Post
my 1992 sl2 started idling rough so I did a compression test dry and wet. Results are #4 185-210 #3 90-125 #2 185-210 #1 190-210. i did get a 45 code when It started idling bad. Runs fine at higher rpm. The engine was just a little warm.I already started taking apart so I can no longer test again. miles are almost all highway not sure how many but I can do the math(75 mile road trip for a number of years) and it is pushing 300,000. I would like to keep it alive a few more years.(50,000 would be nice) Any thoughts?
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97 SC2 ~253K

95 SC2 ~235K +/running-- "All in the Family"
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