| [GMCnet] EFI, and ignition timing. [message #330458] |
Thu, 29 March 2018 10:57  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Senior Member |
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Going to Elkhart In last fall. I found that the distributor was loose. Was running fine. Didn't have a timing light with my. So I just tightened the bolt to hold whatever I had. Decided Tuesday to check the timing. As I wanted to test run the Mercedes Benz fan clutch that I just installed. Moved the GMC out on the driveway. Set the timing to 8 degrees. It couldn't hardly pull itself. And popping back at the TB. Advanced the timing to 12 degrees. Ran perfect. ( And no. The timing mark on the pamper hasn't moved. I confirmed that. ) And since I have the Howell EFI that controls the distributor. Plus the knock sensor. It's just interesting that 8 degrees should be fine. As a note. The cams not original. So I'm thinking that the cam profile is causing this. 78 Royale 403
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