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351 idles too fast???????

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Old May 10, 2003 | 04:47 PM
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From: Forest Hill
351 idles too fast???????

Well I got my 86 F-250 on the raod today and it runs great except it idles at around 11-1200 rpms. It is a stick and the sticker says it should be at 800. I have adjusted the timing, dash pot and back the idle screw all the way out but it still idles at 1100. Can't detect any vaccumm leaks, but when I plug off the pcv valve the idle drops. Could it be bad? The carb is a Holley 4bbl that is stock on my 351. Any suggestions?????
 
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Old May 10, 2003 | 05:38 PM
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From: The Big, Oregon
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351 idles too fast???????

Well, try replacing the PCV valve, they are only about $2. Also check the choke linkage to make sure it isn't binding up and holding the throttle open a little.
 
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Old May 10, 2003 | 11:36 PM
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351 idles too fast???????

Also, try to wiggle the throttle cross-shaft - over time, it can wear a slot into the aluminum casting, creating not only a bind, but a vacuum leak.
 
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