Question about 1990 Oldsmobile Cutlass Ciera
When accelerating motor backfires thru TBI ? help . Idles smooth .
Most likely cause is a broken valve spring on one of the intake valves. Seat pressure is light enough to idle smooth but on acceleration the dynamics increase the pressures and the spring can not keep up. Hangs the valve open breifly and you get a backfire through the TBI.
Hope this helps.
Posted on Jan 22, 2009
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Posted on Jan 02, 2017
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