Ignition malfunction - Team Camaro Tech
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post #1 of 2 (permalink) Old Aug 6th, 02, 11:36 AM Thread Starter
Join Date: Aug 2001
Posts: 1
I have a 1967 rs/ss Camaro with a 350.The engine is not original, but the correct year.
It was running good, but started missing and backfiring. I checked the timing and it was missing badly and sometimes off as much as 12 degrees at idle. Finally it got to where it would not start. It cranks fine. The following items have been replaced: coil, rotor, spark plug wires, distributor and distributor cap. The following items are newly replaced in the last year: starter(checked putting out good voltage), wiring harness, and ignition switch. When cranking, I am getting 9 volts to the coil, a good spark coming from the coil and a dwell of 30 degrees.I set the timing at TDC on #1 and removed the timing cover.The timing chain and everything is intact. The crank timing mark is at the top of the sprocket and the cam timing mark is at the top of the sprocket. It is 180 degrees off from the information I have read. I read that this is not normal, but can occur on rare occasions. How can I determine if the cam is in the correct position? Is it possible that the timing chain slipped 180 degrees before failing to run or start? That doesn't seem reasonable. I haven't removed the chain or sprockets, but they seem to be ok. What should I look for? The chain is slightly loose. Is this normal.
I also removed the fuel line and am getting good flow when cranking.Is it possible the Carter Quadrajet I had rebuilt 3 years ago is malfunctioning? How would I go about checking this? Would this cause it to miss and backfire? The heads and air intake were removed and cleaned last summer. All valves were checked and repaired as necessary. There are no unusual noises when cranking.
Is there a way to check the fire to the spark plugs while cranking? Is there any publication out that would take me through a step by step process of troubleshooting ignition problems? Thanks, Bob
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post #2 of 2 (permalink) Old Aug 6th, 02, 12:56 PM
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Join Date: Sep 2000
Location: Washington, Michigan USA
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Bob -

The cam setup is fine - when the dots are at 12 and 12, it's at #1 TDC - when they're at 12 and 6, it's at #6 TDC. Pull a plug, stick it in the wire, and hold the side electrode or plug shell against the engine while you're cranking it to see if you're getting spark to the plugs (wear gloves), and go from there.

'69 Z28 Fathom Green
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