351 Idling Problem
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351 Idling Problem
Greetings!
I recently purchased a 1978 Ford F150 with a 351 Windsor and C6 transmission. The PO put on an Edelbrock Performer RPM intake, a Performer 650 CFM carb with manual choke, a Performance Distributors Davis Unified Ignition, and a Performance Distributors Adjustable Timing control.
I have to hold my foot on the gas to get it started and hold it there until the engine warms up, otherwise the engine dies. Once it is warm I can open the choke fully and the engine idles roughly. I adjusted the idle mixture and got a maximum vacuum of about 15 inches HG. If I adjust the timing control to 12 degrees advanced, the engine smooths out nicely and I can get almost 20 in HG. However, the truck will diesel for about 10-20 seconds at this setting.
What am I doing wrong? What is the purpose of the adjustable timing control? Any ideas how to fix this?
Thanks in advance for any suggestions.
I recently purchased a 1978 Ford F150 with a 351 Windsor and C6 transmission. The PO put on an Edelbrock Performer RPM intake, a Performer 650 CFM carb with manual choke, a Performance Distributors Davis Unified Ignition, and a Performance Distributors Adjustable Timing control.
I have to hold my foot on the gas to get it started and hold it there until the engine warms up, otherwise the engine dies. Once it is warm I can open the choke fully and the engine idles roughly. I adjusted the idle mixture and got a maximum vacuum of about 15 inches HG. If I adjust the timing control to 12 degrees advanced, the engine smooths out nicely and I can get almost 20 in HG. However, the truck will diesel for about 10-20 seconds at this setting.
What am I doing wrong? What is the purpose of the adjustable timing control? Any ideas how to fix this?
Thanks in advance for any suggestions.
Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
so this must be a 2wd truck then.
how new/old are the spark plugs and what type? how do the plug wires look? is the gas new or old?
Perhaps the carb needs rebuilt. I am not familiar with the dizzy, ignition setup you have. but the adjustable timing control must take the advance out to set base timing. perhaps there is a spout connector or something that needs pulled to allow for this.
how new/old are the spark plugs and what type? how do the plug wires look? is the gas new or old?
Perhaps the carb needs rebuilt. I am not familiar with the dizzy, ignition setup you have. but the adjustable timing control must take the advance out to set base timing. perhaps there is a spout connector or something that needs pulled to allow for this.
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I removed the timing adjuster per Performance Distributor's recommendations but I couldn't get it started. I quit and unhooked the positive battery terminal when I saw smoke coming out of the air cleaner.
The vacuum lines all looked fine.
Apparently the DUI needs a 12V connection. Right now it is attached to the factory ignition cable so I don't think it is getting the full 12V it needs.
Thanks for the suggestions guys.
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