My truck is a 1987 4cyl and when i turn the key on the throttle body fills up. on 1990 GMC S15

When i turn the key on the throttle body fills up

by in Sparta, TN on January 19, 2014
2 answers
ANSWER by on January 19, 2014
Leaking injector o-ring seals. Most likely! Unplug injector wire connector to see if it still does it. Post the test results for more info.
ANSWER by on January 19, 2014
A defective ignition module was a common cause for this. They would falsely send a very fast pulse on the ref wire to the PCM even without the engine cranking.

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