The skipping is back!!!
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Originally Posted by nicksgt
Well I know the guy had the parts store really well and he said that he didnt think it would throw a code either but he would plug it in anyway and he did and it said #6. Like I said I replaced that coil and the boot on 6 and it ran fine for a few days then it started to skip again so then I did the plugs and it ran good for a week and now its skipping again.Its not constant but its there so maybe its another coil on its way out?
Hope this helps...and good luck!
biz
Elder User
Joined: Oct 2005
Posts: 666
Likes: 0
Id take it to ford, cuz theres something really fishy going on with it. If a missfire #6 detected, there shoulda been a code thrown. Unless it is a pending code. Have someone else scan it to see if they can pull anything. Id suggest takin it to someone who can do a factory specific scan, not a global scan.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Originally Posted by 88FordF-150
Id take it to ford, cuz theres something really fishy going on with it. If a missfire #6 detected, there shoulda been a code thrown.
This means the computer does not check lots of things for out-of-bounds or other erroneous information.
I can totally unplug the MAF on my truck, and NEVER GET A CHECK ENGINE LIGHT.
Misfire code thresholds are higher for the V10 because of the OBD-I vs. -II thing.
It's VERY possible that it's logging a code but not throwing the check engine light. Also, it's very possible that whoever is scanning the computer knows about misfire counters.
Keep plugging away at it - like Biz said, figure out which cylinder is misfiring, switch the COP with a known-good cylinder and see if the misfire follows the COP.
Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Originally Posted by nicksgt
If I go to ford and it dosent throw any codes are they gonna be able to tell whats wrong?
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New User
Joined: Mar 2004
Posts: 22
Likes: 0
I am chasing an intermitant miss as well. I have no errors code but are you saying if I connect my reader it might tell me something? I have new plugs (due anyway) and boots to try out first and then I will move onto the COP.
Last edited by ChrisRoot; Jan 19, 2007 at 07:47 PM.
Mountain Pass
Joined: Feb 2004
Posts: 119
Likes: 5
Missfires, unless they are constant, can be diificullt to pinpoint. The ecm may not
record a missfire untill if gets real bad. Early ford OBD II vehicles used to be too
sensitive to every miss fire and throw erroneous codes under very slight missfires,
so ford changed the programs to be able to accept them for much longer time periods.
I was in the dealership when OBD II was new and I was allways finding missfire codes
with no apparent problems! After reprogarmming many vehicles, the problem went
away, but now slight or intermittant missfires don't show up on the scan tool even
under live data! I woul change all the plug boots and use silicone di-electric on all of them.
record a missfire untill if gets real bad. Early ford OBD II vehicles used to be too
sensitive to every miss fire and throw erroneous codes under very slight missfires,
so ford changed the programs to be able to accept them for much longer time periods.
I was in the dealership when OBD II was new and I was allways finding missfire codes
with no apparent problems! After reprogarmming many vehicles, the problem went
away, but now slight or intermittant missfires don't show up on the scan tool even
under live data! I woul change all the plug boots and use silicone di-electric on all of them.
New User
Joined: Mar 2004
Posts: 22
Likes: 0
Just connected my scan tool and found that cylinders 2 & 10 are misfiring. The problem comes and goes. When the weather warms up a bit I will change the plugs and boots and see if that fixes things. If not, I try swapping COP's to see if the problem moves.
New User
Joined: Mar 2004
Posts: 22
Likes: 0
I have a cable that I plug into my laptop. I bought it used a few years back. I have the PWM version - they have other versions that work in a wider range of vehicles. Its not as convenient as a handheld reader but I find it easier to use and the s/w updates are free.
OBDII Automotive Scan Tool and Virtual Dashboard
OBDII Automotive Scan Tool and Virtual Dashboard