1998 Ford Expedition code P0353 new coil new plugs still ge

CAMPROB

MEMBER
1998 FORD EXPEDITION
V8
2WD
AUTOMATIC
226,000 MILES

I just bought a 1998 expedition because it was running terribly, pulled the codes and got p0357, p0353, and p0352. I have replaced all the spark plugs except for number 6 (havn't had a chance to pick up a 7mm flex socket yet) and replaced coils on cylinders 7, 3, and 2. Codes p0357 and p0352 went away, but p0353 keeps coming back and there is a definite miss, sometimes a little better sometimes a little worse. I swapped out coil #3 again just to make sure that I hadn't gotten a bad coil somehow and still get the same code. I'm stumped as to where to go from here. New ECM?

6 Replies

JACOBANDNICKOLAS

MECHANIC
109,913 POSTS

Check engine compression on that cylender and make sure you are getting power to the coil and the injector.

Let me know what you find.

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Monday, March 29th, 2010 AT 10:14 AM

JACOBANDNICKOLAS

MECHANIC
109,913 POSTS

Sorry, I also want to know if you replaced the rubber boot to the plug. I have seen them go bad an acr in the head causing a misfire.

Let me know.

Joe

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Monday, March 29th, 2010 AT 10:19 AM

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So I realized that I was counting the cylinders like a chevrolet and not like a ford. Replaced the right coil this time cleared the codes and everything is good on #3, but now I'm getting a p0302, I had an extra coil so I replaced it, but now that code won't go away. Tomorrow sometime I'll pull the plug and coil and investigate further, I would appreciate any suggestions. Thanks for your help.

Robert

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Wednesday, March 31st, 2010 AT 9:59 PM

JACOBANDNICKOLAS

MECHANIC
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Check the plug. It may be fouled. Can you feel the miss?

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Thursday, April 1st, 2010 AT 7:31 AM

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3 POSTS

I finally got around to pulling the plug this evening, and the tip was bent completely down to the electrode. I'm not really sure how that happened, I don't remember dropping any of the plugs and I checked the gap on all of them before I installed them. Anyway, I regapped the plug, and reinstalled it with the original coil, code seems to be gone for good now, and I don't feel the miss anymore. Thanks for your help. The one thing that I can't figure out is why the p0302 code never showed up until I got the p0353 to clear for good. Oh well, I guess that goes into the mysteries of modern electronic ignition systems. Thanks again for the suggestions, and help.