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1982 Oldsmobile Cutlass Calais 2D Coupe

1982 Oldsmobile Cutlass Calais
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January 16, 2011, 6:09 am

George C
 

Question: How to check timing marks on 1990 Olds Calais 2.5L engine

Replaced timing chain but still runs rough and backfires. Won't start good in cold weather.


January 19, 2011, 10:32 am

Elizabeth K
Expert Mechanic

There are two kinds of ignitions on these cars, and both of them have the timing adjusted by the computer. If yours is off, you may have a stretched chain. You may also have a lean misfire if your carb adjustment is off or your fuel system is compromised (clogged fuel filter, worn fuel pump).

Rough start cold is also symptom of the mixture being off, probably needs a carburetor adjustment. Could also be a bad ECT (engine coolant temp) sensor.


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January 20, 2011, 5:00 am

George C
 

Did no answer the question. How do you check the timing marks to find out if it has a stretched chain before disassembly? Can you use a timing light? Are the marks on the harmonic balancer and what marks are there? Don't want to change timing belt if not necessary. And don't want to replace everything else before checking the timing marks. Thanks George


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