Posted by Sprint 6 on January 15, 2015 at 10:52:24 from (107.77.85.125):
In Reply to: Gmc 7000 update posted by Zach Scherf on January 15, 2015 at 08:40:37:
Thanks for the link to the original post. First, as others have mentioned, check the ground wires first, there are usually two sets at the front of the intake or thermostat housing. If the two terminals are stacked on the same bolt, put one on another bolt. TBI systems are very sensitive to the grounds. Make sure they are separate, clean, and tight.
Second, check the distributor reluctor magnet. It will be the piece under the rotor that turns with the engine and has eight points on it. The distributor has to be removed and disassembled for a complete inspection. You are looking for any cracks in the magnet that is sandwiched in between the two metal pieces by rivets. Also check for cracks in the piece with the eight points. Any cracks in the metal piece usually make them not start, but they can do all sorts of silly things. Cracks in the magnet lower the output of the pickup coil and can cause the ignition module to not be able to send an accurate signal to the computer. Any cracks require a new distributor shaft or reman distributor.
Third, make sure the exhaust is grounded good. If the exhaust is not well grounded, the oxygen sensor cannot do its job.
Good luck, this is the best I can do. O2 sensor problems can usually be caught with a scan tool. The distributor problem can only be caught by experience or a scope. BTW, those run higher fuel pressure, 32-36 psi on the 366 and 427 only. I have seen some shops try to tell people they have too much fuel pressure because pick ups run 9-13psi. Good luck.
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