99 v10 REBUILT>>>>>MISS>>>>>>NO CODE
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99 v10 REBUILT>>>>>MISS>>>>>>NO CODE
after a valve grind, heads magna fluxed, and decked..... the cylinder walls...still had the cross hatches, this baby ran perfect for three weeks then it would miss for a minute then be fine.....misses all the time now.....dealer says this is how coil overs act on the way out... spordiac like that.....the problem is this is apperently not bad enough to throw out a code....so short of taken out to the big scope.....200$$$ is there a way to figure out what ## ??? Mike in Omaha 
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Cargo Master
Joined: Dec 2003
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From: Redford, Mi.
If someone you know has a good scanner it will tell you miss fires per cylinder, that is what you need to know, either switch out the COP or change them to another location to see if they missfire in that location to make sure it is the COP.
Tuned
Joined: Oct 2010
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Missfires due to the COP are very commonly not reported. If he doesn't have a CEL, he's got nothing to go on in the missfire department. The thread I provided a link for goes over all the troubleshooting for this.
Cargo Master
Joined: Dec 2003
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From: Redford, Mi.
I have autoenginuity scanner software for my laptop, I had the same problem, no CEL, my software will tell you percent missfire per cylinder, that's how I fixed my missfire issue. All depends on the scanner being used, an autozone scanner will not tell you this, a snap on scanner or many others I'm sure as mine does, will tell you missfires per cylinder.
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Tuned
Joined: Oct 2010
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I have autoenginuity scanner software for my laptop, I had the same problem, no CEL, my software will tell you percent missfire per cylinder, that's how I fixed my missfire issue. All depends on the scanner being used, an autozone scanner will not tell you this, a snap on scanner or many others I'm sure as mine does, will tell you missfires per cylinder.
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From: Stephensville WI
That sounds great, but I wonder what it references to know that it has a misfire? I have a decent scanner, it does all vehicles, abs codes, data loggin, etc, but it still can't detect a missfire unless the engines computer detects it...and if the engine's computer detects it, usually it will throw a CEL. Not always, but usually. Hmmm. How pricey was that software you have?
Banned
Joined: Apr 2008
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From: Shawnee, Kansas
V-10 misfires...
I have read on this blog and in Ford service manuals that the CEL will not illuminate in many situations that you would otherwise expect. The reason is the V-10 is listed as a 'heavy duty engine' according to the emission folks.
The hand-held scanners that most of you (and me) have will not detect this. A high-end scanner (like the dealer has) with an oscilliscope will do the trick.
Mine was diagnosed in the service drive. Upon inspection the locking tab had broken out of the plug causing an intermittent connection.
The hand-held scanners that most of you (and me) have will not detect this. A high-end scanner (like the dealer has) with an oscilliscope will do the trick.
Mine was diagnosed in the service drive. Upon inspection the locking tab had broken out of the plug causing an intermittent connection.
Tuned
Joined: Oct 2010
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No, actually you have to have an almost dead cylinder before you light a CEL on these engines. A misfire will throw a pending code, but before a CEL is lit you need X misfire codes over a Y time period. You can have a real rough running engine with no CEL. This is why it is important to use a scanner that reads the pending codes.
Cargo Master
Joined: Dec 2003
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From: Redford, Mi.
That sounds great, but I wonder what it references to know that it has a misfire? I have a decent scanner, it does all vehicles, abs codes, data loggin, etc, but it still can't detect a missfire unless the engines computer detects it...and if the engine's computer detects it, usually it will throw a CEL. Not always, but usually. Hmmm. How pricey was that software you have?
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