Rebuilt Engine Problem - Please Help

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Mar 7, 2002 | 07:42 PM

#16

sauerf100s

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From: Ft. Walton Bch 32547

Rebuilt Engine Problem - Please Help

I'm almost ready to do the unthinkable and buy a Chevy. I'm one step from pulling my hair out. Today I mounted a clean gas tank from a truck I'm restoring in the back of my truck. Hooked it up, and put some good gas in it, and went for a drive. Same problem. I think that this safely eliminates the fuel delivery problem. It's really weird. If I creep up on the RPM's, I can get almost WOT and still run smooth. As soon as I try and get that last quarter inch, it starts to run rough and lose power. If I let off on the gas a little, it picks up power. It's worse if I nail the gas hard all at once. I'm thinking that vacuum has something to do with it somehow. I guess it could be valve timing, but it doesn't seem like it would start and run as good as it does at every other throttle position if that were the case. Maybe I just need to put a little slack in my throttle cable so I can't get WOT, and don't worry about it. Not. I'm not giving up until it runs the way it should. Any ideas?

Mar 7, 2002 | 10:16 PM

#17

cobraguy

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From: San Diego CA

Rebuilt Engine Problem - Please Help

Steve just curious, have you tried running it up with the vacuum advance disconnected and the line plugged. If the problem is in your distributor it should get to WOT without missing it won't make the same amount of power but it shouldn't flatten out either. If this check makes no change I'd look at the fuel pump volume. Good luck, Rich.

Mar 8, 2002 | 01:28 AM

#18

sauerf100s

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From: Ft. Walton Bch 32547

Rebuilt Engine Problem - Please Help

Thanks Rich, I'll give that a try after work.

Mar 8, 2002 | 08:08 AM

#19

cobraguy

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From: San Diego CA

Rebuilt Engine Problem - Please Help

Steve one more thing, if you can, hook up a tach and drive it, when it misses see what the tach is doing. If it fluctuates at all your problem is ignition if it just stops climing your problem is fuel.

Mar 8, 2002 | 01:26 PM

#20

sauerf100s

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From: Ft. Walton Bch 32547

Rebuilt Engine Problem - Please Help

Mar 9, 2002 | 01:20 AM

#21

LxMan1

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From: Louisville,Ky.

Rebuilt Engine Problem - Please Help

[updated:LAST EDITED ON 09-Mar-02 AT 02:22 AM (EST)]Sounds to me like a fuel starvation problem. My first place to go would be the carb. Try installing jet extensions on the rear jets. I think that under hard acceleration, the gas is sloshing away from the jets, then when you let out of it, the fuel returns to the front and covers the jets again. that is why it will rev up higher if you ease into it because you are not jerking the truck hard enough to uncover the jets.
Jimmy

Mar 9, 2002 | 07:14 AM

#22

sauerf100s

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From: Ft. Walton Bch 32547

Rebuilt Engine Problem - Please Help

I feel I eliminated the possibility of the carb being the culprit by trying a different carb. I think I mentioned I tried a Carter AFB that I run on a different truck with a 352. Exact same problem. But thanks for the suggestion.

Mar 9, 2002 | 01:52 PM

#23

LxMan1

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From: Louisville,Ky.

Rebuilt Engine Problem - Please Help

Oh yeah, sorry. Another thing could be a wire going to ground when the engine torques to one side under hard acceleration. Maybe one coming thru the firewall? Probably not, but another place to look.
Jimmy