I've been known to overlook the obvious a time or two myself!
460 EFI Miss
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yeah, well i might go ahead and take the cam out and see. It's the only thing in the motor that's not new. it's looked fine when it was out when i rebuilt it. it kinda makes sense, the one night after i had it running really good, the timing jumped back like 20 degrees so i adjusted it back to where it's supppose to be, it's pretty much the last thing to check as of right now. just sucks i have to tear it down again.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
yeah, well i might go ahead and take the cam out and see. It's the only thing in the motor that's not new. it's looked fine when it was out when i rebuilt it. it kinda makes sense, the one night after i had it running really good, the timing jumped back like 20 degrees so i adjusted it back to where it's suppose to be, it's pretty much the last thing to check as of right now. just sucks i have to tear it down again.
Fleet Owner
Joined: May 2009
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From: Gilbert, PA
Could you elaborate a little more on that statement in bold above? Timing does not "jump" on it's own unless something bad happened such as the timing chain jumping a tooth or your distributor has a worn down drive gear or the distributor hold down bolt was loose. How did you check/"turn back" the timing?
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Could you elaborate a little more on that statement in bold above? Timing does not "jump" on it's own unless something bad happened such as the timing chain jumping a tooth or your distributor has a worn down drive gear or the distributor hold down bolt was loose. How did you check/"turn back" the timing?
Fleet Owner
Joined: Oct 2005
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From: Kentucky
I'll stick with my original statement. Timing does not jump unless something bad happened. One other thought: the harmonic balancer ring may have slipped. Is it new too? Regardless if it is or not I would check if the pointer is at 0 (zero) degrees when the engine is at TDC.
Tuned
Joined: Aug 2010
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Have you changed out you're tfi module? what about the hall effect sensors in the Distributor? They are known for getting loose and moving around...
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I'll stick with my original statement. Timing does not jump unless something bad happened. One other thought: the harmonic balancer ring may have slipped. Is it new too? Regardless if it is or not I would check if the pointer is at 0 (zero) degrees when the engine is at TDC.
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changed everything
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Well I have been working on the truck and found a issue. the cam walked on me, broke the retaining ring and with the cam all the way in the lifters wasn't but a 1/4 of the lobes. the cam gear bolt was half way unthreaded. so i pulled the motor cut my losses and put another one in and it runs great.
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