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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 08-03-2014, 02:55 PM
JonEB JonEB is offline
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Misfire Cylinder 1 7.5l P0301

Check engine light came on recently with code P0301. "Cylinder one misfire" I switched wires with adjacent plug (and at distributor cap) reset code, and same code popped up next day. Replaced cap, rotor and #1 spark plug and reset code: same code popped up. Did a compression test on #1 cylinder: 120 lbs which held constant for 10 minutes. (new spark plug doesn't even look like its' seen one explosion in the cylinder - white porcelain and shiny metal after the 40 mile test drive to work and back).
Could it be the injector? ( it ohmed out at 5.7)

Thanks FTE team for any help here.
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Old 08-03-2014, 05:18 PM
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Old 08-03-2014, 08:21 PM
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1997 F250 crew cab with 7.5l (460 cubic inch) gas.
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Old 08-04-2014, 05:34 AM
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Old 08-04-2014, 06:38 AM
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Are your plug wires routed correctly and not crossing all over each other? There is actually a recommended routing for them... I've always just run them nice and neat and never had a problem.

I do remember one time I had old plug wires that were failing and causing a misfire under load, but otherwise ran fine at idle and cruise. How old are your wires?
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Old 08-04-2014, 11:18 AM
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Originally Posted by dixie460 View Post
Are your plug wires routed correctly and not crossing all over each other? There is actually a recommended routing for them... I've always just run them nice and neat and never had a problem.

I do remember one time I had old plug wires that were failing and causing a misfire under load, but otherwise ran fine at idle and cruise. How old are your wires?
My wires are about 3 months old and higher quality than the budget set. I do however need to clean up the routing with some guides though. I'll try that.
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Old 08-04-2014, 12:33 PM
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The injector should be between 11-18 ohms, so replace the injector
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Old 08-04-2014, 12:33 PM
 
 
 
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