Engine light on

Asked by Oct 16, 2017 at 09:49 PM

Question type: General

85 GMC C1500 pick up truck. Rebuilt 305
engine. And transmission. Check engine
light comes on when on hywy speeds. What
can it be.

2 Answers

134,665

Read the OBD1 codes. Look up how on the net.

1 people found this helpful.
125,905

As you had a check engine light it has stored the code, so either have the code pulled by some one with a scanner that can do old GM OBD 1 or do it yourself using the paper clip and read the flash out code. More on how to do that is on you tube if you would like to watch a video.

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