misfire
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Freshman User
Joined: Dec 2007
Posts: 47
Likes: 0
From: Utah
misfire
Ok here is a weird one. My 99 Expedition was running great. I lifted the hood and sprayed off the engine (it was running) to get all the dust and dirt off of it. It started stumbling and I stoped spraying and shut the vehicle off. It acted like it was misfiring for about 5 days after that, and then today the check engine light went off and it is running fine again. part two of my dilema. I pluged a scanner in to see what the code was for the check engine light and it doesn't work. The scanner was checked on another vehicle right after that and it worked fine.
Elder User
Joined: Aug 2004
Posts: 551
Likes: 1
If you got water down in the plug wells, you could cause a miss or misfire. I would remove the boots and check them for cracks. Replace them if they're the originals. Take your expy to a parts store to see if they can read it. If they can, then check your set up on your scanner.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
If the CEL was off when you scanned it, the scan tool won't get any codes (although a good scanner can see 'pending' codes if they are present.)
(After "n" key cycles with out the ECM finding the misfire the ECM will clear the misfire DTC and turn the CEL off (if that was the only DTC present.)
(After "n" key cycles with out the ECM finding the misfire the ECM will clear the misfire DTC and turn the CEL off (if that was the only DTC present.)
Elder User
Joined: Aug 2004
Posts: 551
Likes: 1
If the CEL was off when you scanned it, the scan tool won't get any codes (although a good scanner can see 'pending' codes if they are present.)
(After "n" key cycles with out the ECM finding the misfire the ECM will clear the misfire DTC and turn the CEL off (if that was the only DTC present.)
(After "n" key cycles with out the ECM finding the misfire the ECM will clear the misfire DTC and turn the CEL off (if that was the only DTC present.)
