Timing issues
#1
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Hello everyone, I'm new to the forum. I have a 97 Z28 with the T56. One night it decided to die on me and not restart. The Optispark was trashed, I replaced it and the engine still wouldn't start. I had a mechanic friend come over and we discovered that the timing was off by pulling the valve cover and rotating until #1 was at TDC. I pulled off the timing cover to inspect/replace the timing chain and discovered that the timing marks are still lined up. Could my PCM be faulty and advancing/retarding the timing? I'm kinda at a loss on where to go at this point.
#2
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what did you look at to make you think the timing was off? are you sure the opti was installed correctly. you can get them in wrong. can also get a new one that is not good. what opti and where did it come from? did you scan it for codes? did you test any of the systems/sensors?
#3
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what did you look at to make you think the timing was off? are you sure the opti was installed correctly. you can get them in wrong. can also get a new one that is not good. what opti and where did it come from? did you scan it for codes? did you test any of the systems/sensors?
#5
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All clocking/timing signals on the LT1 are provided by the Opti. In 1996 a crank position sensor was added just to detect misfires, and it has no effect on how the engine runs. If you believe there is a timing problem, take a good look at the Opti. If you installed a bargain unit, good luck to you.
#6
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Have you had the ICM checked? Have you checked fuel pressure? The opti can & has been installed incorrectly because I've seen it happen. Its a simple mistake that can happen.
http://shbox.com/1/opti_back.jpg
Make sure you got the cam pin in the correct slot.
http://shbox.com/1/opti_back.jpg
Make sure you got the cam pin in the correct slot.
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