Ford Truck Enthusiasts Forums

Ford Truck Enthusiasts Forums (http://www.ford-trucks.com/forums/index.php)
-   1987 - 1996 F150 & Larger F-Series Trucks (http://www.ford-trucks.com/forums/forum28/)
-   -   Misfire Cylinder 1 7.5l P0301 (http://www.ford-trucks.com/forums/1328693-misfire-cylinder-1-7-5l-p0301.html)

JonEB 08-03-2014 02:55 PM

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.

projectSHO89 08-03-2014 05:18 PM

What are you working on?

JonEB 08-03-2014 08:21 PM

1997 F250 crew cab with 7.5l (460 cubic inch) gas.

redford 08-04-2014 05:34 AM

Moved to 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks forum

dixie460 08-04-2014 06:38 AM

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?

JonEB 08-04-2014 11:18 AM

Quote:

Originally Posted by dixie460 (Post 14556436)
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.

BoKnowsDiesel 08-04-2014 12:33 PM

The injector should be between 11-18 ohms, so replace the injector


All times are GMT -5. The time now is 01:13 AM.

Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.