Question about 1998 GMC Sierra
Hi, I think the distributor only goes in one way, so no way to get it wrong and no timing adjustment either. That said, the thing does rotate and so you do have to get it where the sparks can reach the terminals inside. You might want to bring #1 to TDC (take the plug out and use a screwdriver to check when it's all the way up) and then take the cap off to make sure the rotor is aligned to the terminal in the dist. It might align with the #1 or the #6, depending on whether #1 is on compression or exhaust stroke. Usually, if #1 and #8 distributor terminals are in front, you're about right.
Other things that can affect mileage are a bad fuel pressure regulator or camshaft position sensor. The latter will usually put the engine light on if it craps out, but the regulator may not. The regulator is on the fuel rail. Pull the vacuum line off the regulator and plug it with a golf tee. Then start the engine and check for gas coming out of the open vacuum port. If it does, replace the regulator. If you have a schrader valve on the fuel rail, check the preesure there with engine running. It shouldn't be more than 65 psi even with the regulator plugged in. It should peak around 60 psi when the throttle is cracked wide open.
Posted on Mar 27, 2011
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Posted on Jan 02, 2017
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