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im at a dead end

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Old Mar 3, 2011 | 04:48 PM
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im at a dead end

Please help I've got a 79 f150 with 351w that was running great then just started missing the other day. I did a full tune up and no change. Checked for vacuum leaks and intake leaks haven't found anything im stumped
 
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Old Mar 3, 2011 | 07:17 PM
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have you checked all the plug wires to make sure there is fire going to each cylinder?
 
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Old Mar 3, 2011 | 07:22 PM
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No I haven't but I will start there tomorrow. Thanks
 
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Old Mar 3, 2011 | 07:59 PM
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Tap the EGR valve to make sure it's closing. If it's stuck open your idle will be rough like a miss or a vacuum leak.
 
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Old Mar 3, 2011 | 08:25 PM
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I pulled it out shook it and heard the ball going back and forth. Did notice when it was not in the valve cover the engine sounded slightly better but nothing I would call a remedy
 
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Old Mar 3, 2011 | 08:58 PM
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EGR valve, not the PCV valve. You pulled the PCV valve from the valve cover. The EGR is the big round one behind the carb with a small vacuum line going to it.
 
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Old Mar 3, 2011 | 09:15 PM
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Ok thanks will try in morning. Tired of looking at it for the night
 
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Old Mar 4, 2011 | 10:53 AM
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did you do anything to it before is started missing & did lights or anything come on? An does it miss all the time at idle & driving or just while driving?
 
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Old Mar 4, 2011 | 10:55 AM
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Didn't touch it. Idle and driving
 
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Old Mar 4, 2011 | 11:49 AM
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Run a compression test.............
 
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Old Mar 4, 2011 | 12:17 PM
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i would check your slop in the timing chain, if the enginge has relatively high miles thats a deffinate possibility. remove the cap from the dist. place a socket and breaker bar on the crank, turn the breaker bar until rotor turns then turn it the other way until it moves again. the amount the breaker bar moves between the movements of the rotor is the slop.if it moves more than 3-5 degrees you might want to think about a timing chain being the problem.
 
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Old Mar 4, 2011 | 12:20 PM
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Ditto the timing chain
 
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Old Mar 4, 2011 | 12:21 PM
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Ok thanks for all this gonna try the compression test and see what im working with
 
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Old Mar 4, 2011 | 12:23 PM
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Well what are the pros and cons to installing a 352 if this windsor is junk. Have a 63 galaxie with 60k original on it.
 
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Old Mar 4, 2011 | 02:54 PM
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Almost the same work as putting in a diesel out of a Land Rover
 
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