Question about 1998 GMC Sierra

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I have a 1998 GMC 1500 4WD pickup where I was just going to replace the distributor cap, rotor, spark plugs, and wires but notice that the distributor cap base (the shaft that goes down into the oil pump) one of the ''ears'' that are threaded for the distributor cap was broke and I had to fix that. So I then had to remove the distributor from the intake manifold. When I put it all back together the truck runs but ''spits and sputters'' when under load (in drive or reverse) but is driveable. Under the hood, on a sticker, it says that engine spark and idle speed are automatically controlled, do not attempt adjustments. Does this mean that I need to have the truck hook up to a monitor at a service station to have the timing fine tuned? Shawn S.

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  • ssheedy Apr 12, 2009

    I don't think that is the problem as the number 1 cylinder is on the driver side at the front of the truck and I have the distributor cap on exactly as I took it off and have the wires correctly positioned. The rotor is pointing right at the #1 cylinder and at the correct position on the distributor cap. It just seems like the timing is a bit off. If I move the rotor just a little bit the truck runs worse. I was just wondering if any one knew what that not on the sticker under the hood means "engine spark and idle speed are automatically controlled, do not attempt adjustments". Just wondering if that means the timing needs to be fine tuned with a monitor or computer.

    Shawn S.


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I'm leaning toward timing 180 out too, but the easy way is to switch around plug wires on to of the cap. It's a faster way to determine if it it's the problem. Switch # 1 with 6, 7 with 4, 3 with 2 and 5 with 8. That will change where the spark goes to. Another Solution is to carefully rotate the cap with wires still attached. Either method will rotate during order 180 degrees without pulling the distributor. If it runs more like it should, then I would pull the distributor and rotate it. But rotating cap or switching the wires on the cap to the correct order will determine if that is ths case. I would like to know if I helped youso please let me know

Posted on Dec 16, 2012

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Sounds like your timing is off by 180 degrees

pull the distributer out.

hold the body and turn the rotar arm 180 degrees and push it back in.


Posted on Apr 12, 2009

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