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Misfire Cylinder 1 7.5l P0301

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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 10-30-2014, 10:39 AM
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Update: P0301 Misfire Code FIXED!

Thanks to all of the FTE Community help on this one. Replaced the injectors and misfire went away, now she's running smooth, climbing grades AND getting better fuel economy. Best part; bought the injectors for $100 rebuilt on EBay.
Here's a link: injectordyne | eBay

Success!
JonEB
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