65ShelbyClone
Founding Member
How do you check for cam walk in a SBF?
With the engine running? I don't know. I guess it would be checked the same way as crank end play.
How do you check for cam walk in a SBF?
It's not the carb. I think the guy on the MSD forum figured it out:
How do you check for cam walk in a SBF?
How do I verify the float isn't physically stuck?
We can suggest this and that and the other thing but if he can't turn the key because it is still apart then no real diagnosis can happen.
first things first.
I can tell by the tone of your reply you think I'm an idiot, but think about it for a second: you've torn the motor down to inspect the timing chain, you've checked and rechecked the timing marker, replaced the plug wires, you've felt the carb floats may be the problem, but found nothing at all to back this up. Yet through the past several months, you seem to be married to the MSD system. At this point you have nothing to lose by finding another ignition system. What's the very worst that could happen? You'll either (A) find nothing wrong in which case I am an idiot or (B) find it now works in which case you now have a great running car. If the timing is randomly moving, it ain't the carbs, regardless of what MSD says, it IS an ignition problem.
I did consider that the MSD was messed up and replaced it, along with my distributor and coil. The only issue with finding another ignition system is that I can't keep throwing money at this problem in $3-500 chunks and continue to see no improvement. So far i've probably burned about a grand replacing parts that apparently were perfectly fine.
I'm almost 100% sure it's cam walk. Did you check the camshaft endplay when you swapped the timing chain?
You said theres fuel in the intake tract. Is it coated or is it puddled?
Hi there sad but true,
I have also been following this thread, interesting for me but a real pain for you.
Forgive me if i missed something ...... You say the timing jumps around, what do you mean by this .. Is the jumping around you having to move the dizzy to keep it running or ?
Still sounds like timing to me IMHO
Steve
Hi,
This is what made me think it was changing ....
Frtom the start of the thread ....
"As a few people on here probably remember, Ive had some issues getting my car running right after the H/C/I build over summer. My car is/was impossible to time and timing would change after starting and wouldn’t stay set, leading to hard starting, poor performance, and now a massive backfire last night as i was tunning it. "
Steve
I had mine set at 34 degrees with the distributor locked out for a while. It drove fine. It was a little hard to start if it was warm, but I didn't have the retard function from the MSD you do now......just something to think about.
if my spark plug wires were wrong, 1 spot off either way... would that cause my strange initial advance reading and/or be why I have to rotate my distributor as far as it would go in order to get it to run decently?