groucho

69 Roadrunner, 440. Starts and runs fine, but once in a while it won't start. Check for spark and it lights right off as if it needed a little shove. Also, when it won't start it'll light one hole when you turn the key from off to the run position blowing fuel out of the carb. One time when it was acting up it actually started when I turned the key from the off to the run position (never to the cranking position). Thoughts? Thanks again

Another thing is I time it by ear as I do a lot of my cars. It runs and idles good for as cammy as it sounds but cranks really slow when hot as if too far advanced. I retard it the least little bit and it barely runs. Can this over sensitivity be related to the original post? THX
__________________

TVLynn

Why not find out the truth ? PUT a Timing light on it. Your starter could be going bad ?

440roadrunner

I would "become armed and ready" so that you can troubleshoot the thing. Carry a test light / multimeter / some test leads and an inline spark tester.

Next time it won't start, try to troubleshoot without disturbing anything. You might have something "simple" like a bad connection in your bulkhead connector, or even a bad contact at the ignition switch. Clip a light to the coil + Clip your inline spark tester to the coil wire Crank the engine using the KEY. Does the coil lamp light up bright, showing the coil has good cranking voltage? Alternatively, hook your multimeter to the coil. Remember, there is no ignition voltage to the coil "in crank" except from the coil "bypass" (IGN2) contacts.

See if it has spark at the test gap.

Mopar ECU? The ECU grounded good? Distributor pickp gap?

Skwerly

You have your vac advance blocked off?

440roadrunner

I don't know why you would think this has a think to do with a no start condition?

groucho

OK, here's the latest. I put the 750HP Holley off my Vette on this thing. (It had slight fuel issues as well as the ignition probs). It idles better, revs smoother. Still has the very narrow span from too retarded to too advanced. Difference is, while in the good running and too advanced to crank while up to temp setting, it'll still crank way too slow, but merely for a split second because it lights instantly with this carb each time so far. Thoughts?

moe7404

are all of your boxs grounded.

440roadrunner

You can easily find out if it's kicking on the starter, just pull and ground the coil wire!!!

Maybe your starter / battery is not all that good.

What kind of compression ratio and cam timing is this thing?