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
108,170 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.

Was this

answer

helpful?

Yes

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

JACOBANDNICKOLAS

MECHANIC
108,170 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

SPONSORED LINKS

Was this

answer

helpful?

Yes

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

CAMPROB

MEMBER
3 POSTS

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

Was this

answer

helpful?

Yes

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

JACOBANDNICKOLAS

MECHANIC
108,170 POSTS

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

Was this

answer

helpful?

Yes

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

CAMPROB

MEMBER
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.