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Old 03-20-2008, 01:26 PM
roperjoe roperjoe is offline
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Cylinder misfire '98 F150 4.2L

One more question guys:
I have been pulling a code for a little over 1 year now thats showing a Cylinder #2 misfire. I don't notice the miss, so its not missing hard. I pulled the plugs, regapped them, then replaced them, with no change. Then I pulled the wires and tested them, and replaced them to be safe. No change. Then I replaced the Coil Pack just to be sure, and no change. Anyone have any clues as to what else might be causing this? The only other thing I think it could be is a clogged injector in that one cylinder. Thoughts? Thanks for the advice.
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Old 03-20-2008, 05:20 PM
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BlueOvalFitter BlueOvalFitter is offline
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What is the code number?
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Old 03-20-2008, 05:33 PM
roperjoe roperjoe is offline
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Sorry about that....its the P0302 code. Thats the only code I am getting. Thanks.
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Old 03-20-2008, 05:41 PM
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It very well could be the injector.My friend was getting code P301 and it turned out to be a cracked plug.
Try pulling the electric connection to that injector and see if changes.Don't keep it unplugged for long due to possible hydro-locking it!
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Old 03-20-2008, 05:44 PM
88FordF-150 88FordF-150 is offline
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Yep id say your next culprit is the injector, though you said its running good, and if the injector stoped working then you would know.
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Old 03-20-2008, 06:51 PM
roperjoe roperjoe is offline
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Maybe the injector is working, just fouled up??
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Old 03-20-2008, 06:57 PM
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You might want to clean out the carbon build up in the intake by the egr and iac motor.
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Old 03-21-2008, 12:54 PM
roperjoe roperjoe is offline
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Hard to change out a single injector?? Intake is clean.
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Old 01-23-2012, 05:15 AM
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I know this is a late post but here's something for someone in need that is reading this . My 98 4.2 liter was experiencing the same problems described in this forum. Misfire on cylinder 4 replaced plugs wires coil pack the whole nine. After a long trial and error I removed my valve cover to find a bad rocker arm. The pushrod was lodge inside the rocker arm. You would think there would have been a lot of noise coming from the motor but there was actually only a slight ticking sound. Not saying its your issue but it is something to think about.
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Old 01-24-2012, 09:37 PM
FORDSVTPARTS FORDSVTPARTS is offline
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Quote:
Originally Posted by snatchinfords View Post
I know this is a late post but here's something for someone in need that is reading this . My 98 4.2 liter was experiencing the same problems described in this forum. Misfire on cylinder 4 replaced plugs wires coil pack the whole nine. After a long trial and error I removed my valve cover to find a bad rocker arm. The pushrod was lodge inside the rocker arm. You would think there would have been a lot of noise coming from the motor but there was actually only a slight ticking sound. Not saying its your issue but it is something to think about.
Thanks for the info. I have a 99 with a #6 misfire, with the same parts having been replaced. I pulled the #6 plug, and look OK as well

It still seems to run good, but its definitely something for me to check.

-Mike R
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Old 01-24-2012, 09:37 PM
 
 
 
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