Learn something new everyday

[Smitch320]

I wish I had some of you guys next door to me, for now this will do.

I'm doing my best learning and try to figure some stuff out for myself.

I do have a question though. As some of you know, I got a Holley 600cfm not long ago and have been working on getting my truck back in the position to be driven daily. Tonight I was driving, and it did what i would call a "misfire" (I guess). It kind of "missed" and then kept on fine at first maybe I thought it was something in the drive train. It has been sitting more than usual, but then i remembered it was a SM465, not some piece of junk, lol. I was going up a slight incline in 2nd gear, so 3rd counting the granny gear.

It did it maybe 3 times in about 45 minutes of test driving around town in various speeds, mostly in 2nd gear though.

Does this sound like maybe a timing issue? The motor only has maybe 30k on it, and the plugs maybe have 20k on them. Should I pull a plug and see if they're fouled?

Oh, and also, I had only had to adjust the idle screw a slight bit. Any tips?

TIA.

 

[Smitch320]

Oh, and I replaced the fuel line and filter when I replaced my carb. I was worried about bad gas so I ran a can of seafoam and ran out the old gas and have had fresh 93 in the tank.

 

[CRM]

I put Seafoam in mine and it ran normal for a little while, then it started doing what yours is. Eventually it started getting worse until it began dying at stops. I pulled the fuel filter out and found the little check valve had basically softened to the point that it was plugging the filter inlet and had slid inside the spring. I installed a new filter and it's been running great. Not saying that's your problem, just that mine was similar to what you describe.

 

[1low4x4]

Probably something with ignition system. Check all plug wires, coil cap rotor and wires that hook to coil...also distributor connections

 

[Smitch320]

I put Seafoam in mine and it ran normal for a little while, then it started doing what yours is. Eventually it started getting worse until it began dying at stops. I pulled the fuel filter out and found the little check valve had basically softened to the point that it was plugging the filter inlet and had slid inside the spring. I installed a new filter and it's been running great. Not saying that's your problem, just that mine was similar to what you describe.

I replaced the filter a day before this occurred, but i am not ruling out the fact that the tank maybe could have had some bad fuel in it still. Highly doubt it, but anything is possible I guess.


thanks for the input.

 

[Smitch320]

Probably something with ignition system. Check all plug wires, coil cap rotor and wires that hook to coil...also distributor connections

I plan on doing this tomorrow. I have a 80 mile trip on sunday and need to make sure it's right haha.

 

[1low4x4]

See if you can find an ethanol free pump in your area to start filling up at