COP going bad, wont set a code.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
COP going bad, wont set a code.
My 98 V10 is at 166K and has lost 4 coils.
It has had a miss for 2 weeks and I know that I am about to lose a 5th, but I have never had one go this long with out setting the CEL.
Any way to find it or do I have to just run it tell I get the CEL?
It has had a miss for 2 weeks and I know that I am about to lose a 5th, but I have never had one go this long with out setting the CEL.
Any way to find it or do I have to just run it tell I get the CEL?
Logistics Pro
Joined: Aug 2007
Posts: 3,974
Likes: 15
From: Millersburg, OH
Get (borrow) a scanner that reads pending codes. It will list the cylinder(s) that have mis-fires. Usually Advanced Auto has Actron scanners that you can borrow that will show pending codes.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
I have tried that before, it does not work on a coil with just an occasional miss.
It has to be flat out dead before that test will tell you, and the CEL is on by then.
Thanks for trying to help.
I will go to advanced tomorrow and have them run the pending code scan.
I will let yall know haw that gos.
It has to be flat out dead before that test will tell you, and the CEL is on by then.
Thanks for trying to help.
I will go to advanced tomorrow and have them run the pending code scan.
I will let yall know haw that gos.
Freshman User
Joined: Apr 2009
Posts: 41
Likes: 2
From: eastern Montana
What works for me on my 1999 V10 is to use a scan tool that can read the mode $06 tests. I happen to have an Actron CP9185 that can do this in a basic way and I'm sure there are plenty of others as well. If there are misfires occuring, the counts start building up in the mode $06 test register for the offending cylinder even if no codes or pending codes have yet been set.
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Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Welcome to FTE and thank you for the help!
I looked up the CP9185 and that is what Advanced used, and it came up with nothing.
How many does it have to have before it sets a code, and how often does it reset the count?
I looked up the CP9185 and that is what Advanced used, and it came up with nothing.
How many does it have to have before it sets a code, and how often does it reset the count?
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Freshman User
Joined: Apr 2009
Posts: 41
Likes: 2
From: eastern Montana
I wonder if they actually checked the mode $06 tests or if they just looked for diagnostic codes. On the Actron tool, the mode $06 tests are under "Special tests" then "Diag mon tests". The misfire test ID for my engine is $53, and under this heading the individual cylinders are $00 through $0A. As you can see, its all hexadecimal and this tool only shows you the raw data but doesn't interpret it for you. If the data hasn't been cleared and its only one cylinder acting up, the good ones should show a 0 count and the bad one would show some hexadecimal value. In my case, if the problem is kicking my a$$, I sometimes have luck clearing the test data with the tool, then driving it a little until it acts up-- then reading the counts again. I believe that I read somewhere also that in some of the older engines the misfire test was $51.