Sudden miss has developed

[Irish_Alley]

Its supposed to be a 4 or so

[SUX2BU99]

4 degrees? Or 4:00 position? I know stock timing is about 4 degrees but usually it gets bumped to at least 10 for some better response and bottom-end.

[SUX2BU99]

I just gave it a twist and took it for a spin. Running so much better now. So I'm not sure what the deal is then with my timing. I know when my cam and heads were put in, my mechanic said he wasn't sure which of the 2 positions that the timing tab was supposed to go back on. Maybe he got the wrong one? He said he figured it out but maybe not. My tab is at about the 2:00 spot on the timing cover. Fingers crossed that I won't experience the missing and shuddering that seemed to come and go, but it's behaving much better with the distro twisted somewhere back to where it used to be.

[Irish_Alley]

4:00 is about the area I would think that the tab should go about 2 o’clock on the balancer

[SUX2BU99]

Okay, I see. The twist made it run better but it's still missing and doing some of it's thing (sigh). I think I'll have to pull all the plugs and see what's up.

What gets me is the thing were if I stomp on it, it will be all funny until about 4000 RPM and then rip like usual. So I'm thinking either:

a) a fuel blockage is being bypassed by the pressure of the pump, which increases with RPM and eventually just builds enough pressure (or suction) to overcome whatever is impeding flow. But I would think this would show up at all times at lower RPM's and not intermittently

b) a fouling plug, failing plug wire or corroded/burnt contact inside the distributor is provding erratic spark delivery at lower RPMs (and lower spark voltages) but at higher RPM, the voltage increase is enough to blow past whatever the problem is. I know electronics and heat do not mix so often an erratic electrical or spark issue can be heat-triggered and it's hard to know when or where it's going to act up

 

[Grim 82]

10 years is a long time to run a set of wires.

[SUX2BU99]

I know that sounds like a very long time, and in a daily driver it would be. These wires are quality pieces and weren't used all that terribly much. The truck was rebuilt as a nice day driver and a toy so it wasn't used and abused daily. Even still though, I guess things like wires do deteriorate over time.

[topp]

I know that sounds like a very long time, and in a daily driver it would be. These wires are quality pieces and weren't used all that terribly much. The truck was rebuilt as a nice day driver and a toy so it wasn't used and abused daily. Even still though, I guess things like wires do deteriorate over time.

The age alone indicates dried out insulation, amongst other things with wires that old.  EVERY wire manufacturer would tell you they should be changed well before 10 years REGARDLESS of usage.

[TexasRed]

I dunno. I've replaced wires older than that before and it was running fine. Parts store wires are only like $20, worth a try?

[topp]

When all else fails, back to basics.
Cap, rotor, plugs, wires....

[SUX2BU99]

I may try replacing the fuel pump. It's old, and stock. Just wondering if I should stick with stock capacity or go wtih an 80 GPH.