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Misfire but no codes

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Old 06-08-2012, 01:06 PM
roscozman roscozman is offline
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Misfire but no codes

2003 Ford Expedition 5.4 ltr Triton is having a misfire but do not get codes mechanic says. He does get a P1780 Transmission Control Switch but does not believe this will cause the misfire. Any help would be greatly appreciated.
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Old 06-08-2012, 05:27 PM
alloro alloro is offline
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Either ride it hard to force the code to appear or take a drive with a scanner attached that reads live data. With the scanner you will be able to see the misfire in real time.
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Old 06-10-2012, 01:04 PM
99Exp 99Exp is offline
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I had the same thing happen to me and it ended up being a lazy COP. The only way we pinpointed it was to do what Alloro said and drove around with a scanner hooked up.
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Old 06-11-2012, 10:24 AM
roscozman roscozman is offline
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What is a "lazy COP"?

Thanks.
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Old 06-11-2012, 01:02 PM
projectSHO89 projectSHO89 is offline
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Originally Posted by roscozman View Post
What is a "lazy COP"?

Thanks.
Donuts, coffee, napping in the car...

Seriously, it's COP that is just starting to fail and the rate and incidence of misfires is not severe enough to set a fault code yet.

Plenty of previous threads - SEARCH keywords "+low +grade +misfire" or similar.
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Old 06-11-2012, 03:28 PM
roscozman roscozman is offline
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Thanks. I did read about the misfire but most people get a code. I believe I have to take my mechanic out for a drive to get a readable code. I now know what a COP is... Coil on Plug.
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Old 06-11-2012, 06:21 PM
projectSHO89 projectSHO89 is offline
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You don't get a code until the misfire passes a certain threshold.

If you read my posts regarding this from several years ago, you'll know what to tell the mechanic.
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Old 06-27-2012, 11:53 AM
roscozman roscozman is offline
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Update:
Let me first say... I did a lot of reading and researching. Since advice given here and on many other posts, problem was a COP. Ordered eight new plugs on ebay from global-automotive at a total cost of $65. Had mechanic put in for $60 and everything is running smooth (also bought small tube of dielecrtic grease). Problem fixed. I have put on about 400 miles and still no problems.

Thanks to everyone who gave advice on this post and other posts as well!!
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