Question about 1990 GMC Sierra
The obd1 codes are 22 Throttle position sensor voltage low ,33 MAP sensor voltage high,44 Oxygen sensor lean exhaust detected
Other than changing the identified parts ,which i imagine are expensive ,check all air intake pipe work as a split or worn hose can cause irregular air intake thus giving a false exhaust reading
Posted on Mar 28, 2014
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Posted on Jan 02, 2017
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