6.2L Misfire cylinders 4 & 7

Grandslam99 · #1 (**permalink**) 07-11-2012, 08:47 PM

Has anyone had cylinder misfire codes and had a sucessfull repair. My 6.2L, 12,000 miles towing has experienced #4 & #7 misfires. It's build date was 8/2010 and falls within the parameters of TSB 10-25-7. According to the servicing Ford dealer the Tech has examined the Rockers/Cam shafts and states that they look okay. Coil packs were moved around and still only cylinders #4 & #7 are reporting misfires.

Any help guys? Raptor's also are listed as experiencing this issue.

Thanks.

fixnair · #2 (**permalink**) 07-11-2012, 11:29 PM

Switch sparkplugs, if still there switch injectors, if still there do a compresion test.

Grandslam99 · #3 (**permalink**) 07-13-2012, 05:01 PM

Just back from the Ford Dealer, NO check engine light. Here's the story as I understand it. No mechanical issues, ALL rockers and Cam's look good, coil over plug on #4 and #7 were replaced, no change. Ford Tech Hotline had Local Tech make the computer relearn the crank/cam shaft sensor position. This is what the paperwork called "Performed CKP Neutral profile correction."
This corrected some "bad learning" in the adaptive power section of the computer.
In the next week or so I'll re-attach the Boat and Trailer and see what happens when we are towing it above 4.5K on the Tach.
If it goes South again I'll report back on this thread.

Enjoy!