1968 F100 ignition timing?
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1968 F100 ignition timing?
Recently purchased a 1968 F100 with 300 i6. The previous owner said he tuned the carb, he did and it runs good. But the ignition timing is not set to factory recommendations and I think the carb was tuned to an incorrect timing. There is a hesatation in low RPMs. I adjusted the timing to factory settings and the idle was faster so I set it back. Two questions: Am I running into trouble by leaving timing as is? Is the hesatation normal in older pickups or part of the timing problem?
Scott
Scott
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hesatation check list
Originally Posted by hopk2517
Recently purchased a 1968 F100 with 300 i6. The previous owner said he tuned the carb, he did and it runs good. But the ignition timing is not set to factory recommendations and I think the carb was tuned to an incorrect timing. There is a hesatation in low RPMs. I adjusted the timing to factory settings and the idle was faster so I set it back. Two questions: Am I running into trouble by leaving timing as is? Is the hesatation normal in older pickups or part of the timing problem?
Hesatation can be caused by: incorrect base timming (retarded or overadvanced), acceleration pump problems, (ball not seating, worn seal) or not adjusted right.Leaking vacuum advance on the side of the distributor, or vacuum line not routed to ported vacuum sorce. Vacuum leaks do the same thing, check the brake booster (if u have power assist brakes). Also tighten the nuts that hold down the carb. Is your air filter clean?Also check the condition of your ignition points, replace if needed. Remember that changing your point gap changes your base timming a little bit. Also check your sparkplugs and ign wires. Use a timming light on all the cylinders near the sparkplugs, they should all flash the same. HAPPY HUNTING if u still have a problem, check the compression...DAHMER
Scott
Hesatation can be caused by: incorrect base timming (retarded or overadvanced), acceleration pump problems, (ball not seating, worn seal) or not adjusted right.Leaking vacuum advance on the side of the distributor, or vacuum line not routed to ported vacuum sorce. Vacuum leaks do the same thing, check the brake booster (if u have power assist brakes). Also tighten the nuts that hold down the carb. Is your air filter clean?Also check the condition of your ignition points, replace if needed. Remember that changing your point gap changes your base timming a little bit. Also check your sparkplugs and ign wires. Use a timming light on all the cylinders near the sparkplugs, they should all flash the same. HAPPY HUNTING if u still have a problem, check the compression...DAHMER
Scott
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Technology is a good thing! Stick with the beginning basics and start with new plugs and wires. Most all older engines will show signs of a worn out dizzy (distributor) inside. A sure indication of that is the drift in the point setting. Not being you, I would install a new electronic dizzy, and a new coil to match the dizzy. Recheck firing order and set the timing. Timing is not a given, after the engine is running, rotate the dizzy to where the engine likes it and it performs the way you want it to.
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If you decide to go with a new distributor, we do offer the D.U.I.-Davis Unified Ignition for the 300 inline 6 cyl. See it at:
http://www.performancedistributors.com/forddui.htm
http://www.performancedistributors.com/forddui.htm
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