Question about 1991 GMC S-15 Jimmy
On your engine, you will need to removed the first spark plug on the drivers side of the engine. (if you are looking at the engine from the front, it will be your right side) Next, have someone "bump" the key as if you were trying to start the engine while holding your finger over the spark plug hole. When air is forced out of the spark plug hole, stop and check the crank shaft balancer for a small groove. It should be lined up the the make on the front of the engine. That will have you a tdc and you always use the number one cylinder to set the timing on you truck. If you need more assistance let me know.
Posted on Jan 02, 2009
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Posted on Jan 02, 2017
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