Still Misses
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Still Misses
What to check next?
My 07 xlt 4x2 4.6 (49700 miles) started missing a couple of weeks ago. Did it for 2 days, the CkEng light came on, then it quit missing and ran normal. CE light was still on, so I had the code read and reset light. Got two codes: ignition missfire #8, and rich fuel. I assume the rich fuel was caused by raw gas in the exhaust.
Anyway, the truck ran fine for two or three days then started missing again. Checked #8 by taking the wiring connector off #8 COP - rough idle unchanged. Pulled COP off #8 and #7 and swapped. Rough idle unchanged and confirmed miss was still #8 by pulling COP connector. With #8 connected, disconnected #7 (with COP from 8) idle was significantly worse.
Replaced #8 plug. Same miss.
Anyone have a suggestion as to what to check next?
My 07 xlt 4x2 4.6 (49700 miles) started missing a couple of weeks ago. Did it for 2 days, the CkEng light came on, then it quit missing and ran normal. CE light was still on, so I had the code read and reset light. Got two codes: ignition missfire #8, and rich fuel. I assume the rich fuel was caused by raw gas in the exhaust.
Anyway, the truck ran fine for two or three days then started missing again. Checked #8 by taking the wiring connector off #8 COP - rough idle unchanged. Pulled COP off #8 and #7 and swapped. Rough idle unchanged and confirmed miss was still #8 by pulling COP connector. With #8 connected, disconnected #7 (with COP from 8) idle was significantly worse.
Replaced #8 plug. Same miss.
Anyone have a suggestion as to what to check next?
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darkestskydiver
1997 - 2006 Expedition & Navigator
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Oct 22, 2011 08:42 AM
