Misfires only at a Stop
Thread Starter
|
Freshman User
Joined: Dec 2005
Posts: 49
Likes: 0
Misfires only at a Stop
Whatsup Fellahs,
I want to know why my 2000 V10 w/ 112,xxx miles misfires at every stop light. This misfire shakes the whole truck. This only happens when i'm D-Drive. When in Park it misfires a little less then in drive. SES light is off. Would this have to do with COP's. Please advise. I"m going nuts and don't know the problem. I guess I can try to answer my own question. Bad COP's.
I want to know why my 2000 V10 w/ 112,xxx miles misfires at every stop light. This misfire shakes the whole truck. This only happens when i'm D-Drive. When in Park it misfires a little less then in drive. SES light is off. Would this have to do with COP's. Please advise. I"m going nuts and don't know the problem. I guess I can try to answer my own question. Bad COP's.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Yeah, sounds like you have one bad one. See if the local auto parts/Autozone will read the misfire counters for you. That'll tell you which cylinder it is.
One thing, if the light is not on, it won't throw a code, so a newbie code-reader-guy will not see any codes and say "there's nothing wrong". They have to look deeper at the misfire counters to see which cylinder is doing it.
Might be time to do the plugs? Have they ever been done?
One thing, if the light is not on, it won't throw a code, so a newbie code-reader-guy will not see any codes and say "there's nothing wrong". They have to look deeper at the misfire counters to see which cylinder is doing it.
Might be time to do the plugs? Have they ever been done?
Thread Starter
|
Freshman User
Joined: Dec 2005
Posts: 49
Likes: 0
Yes I have done the plugs just recently. I didn't see much corrosion on the boots. I'm with you on this one, I might have one faulty COP. I will check with my local mechanic for diagnostics. Thanks Art.
Logistics Pro
Joined: Jan 2002
Posts: 3,733
Likes: 38
at that age I would suspect
Bad but intermitant vacuum leak ( funky rubber elboe joint connector on top left )
Sticking IAC
Bad COP
Crappy fuel or dirty fuel filter
Dirty MAF
and it could be internal problems with the 4R100 auto trans
But I would look at vacuum first, ignition second, intake third before assuming mechanical trans issues
Bad but intermitant vacuum leak ( funky rubber elboe joint connector on top left )
Sticking IAC
Bad COP
Crappy fuel or dirty fuel filter
Dirty MAF
and it could be internal problems with the 4R100 auto trans
But I would look at vacuum first, ignition second, intake third before assuming mechanical trans issues
Thread Starter
|
Freshman User
Joined: Dec 2005
Posts: 49
Likes: 0
Hey guys,
I found this COP repair kit from Granatelli Hi Performance. They mention that Coil on plugs are fixable in reference to replacing the boot and the spring. They also mention that the Coil usually never gets damaged. This could be possible as I tested the resistance on all my coil at 0.8, which is in the range. Im guessing that boots develop cracks due to high heat evnvironment and this allows a spark leak and arcing. Contact springs rust out due to moisture in the spark plug well. My question is would this work if the coil is not bad and help the misfiring, would this stop misfiring. Thanks for the feedback.
I found this COP repair kit from Granatelli Hi Performance. They mention that Coil on plugs are fixable in reference to replacing the boot and the spring. They also mention that the Coil usually never gets damaged. This could be possible as I tested the resistance on all my coil at 0.8, which is in the range. Im guessing that boots develop cracks due to high heat evnvironment and this allows a spark leak and arcing. Contact springs rust out due to moisture in the spark plug well. My question is would this work if the coil is not bad and help the misfiring, would this stop misfiring. Thanks for the feedback.
Junior User
Joined: Jul 2003
Posts: 68
Likes: 0
From: Fallston
Only does it at idle,,sounds like vacuum leak,, cop's will do it at any rpm if one is bad,, will also set code/ck eng light..
Trending Topics
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Originally Posted by Houndog101
Only does it at idle,,sounds like vacuum leak,, cop's will do it at any rpm if one is bad,, will also set code/ck eng light..
"Rebuilding" a COP with a new boot and spring is as easy as going to the local auto parts store and buying "boots". I got them as low as $3 (jobber) each.
In terms of the coil itself never going bad, there is certainly the chance they can crack from heat, or have a winding with a break in it that only opens up when it gets hot. So, testing on the bench is not always a 100% certain test.
But you're right in that most of the time, I suspect the COP is still good, but it's the boot/spring leaking voltage back to ground somewhere instead of it going through the plug.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Junior User
Joined: Jul 2003
Posts: 68
Likes: 0
From: Fallston
Ok,, gotcha.. But every pack COP I've had go bad missed at all speed, not just idle, thats my main point and he just changed plugs and did not see any corrosion or sign of bad boots...
Also why did they use an OBDII plug,, my scanner works fine and found a fault when one or the egr tubes broke loose..Not doubting the info just seems
wierd..Thanks Ted
Also why did they use an OBDII plug,, my scanner works fine and found a fault when one or the egr tubes broke loose..Not doubting the info just seems
wierd..Thanks Ted
Last edited by Houndog101; Aug 1, 2006 at 02:03 PM. Reason: make an addition
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
Art,I found it and you must ask the following "Does the vehicle have Calif emissions on it" Also the vehicle has to be above 8500lb
On edit
If the vehicle does not have Calif emissions ,and is above the weight class you are correct,But I haven't ever worked on a vehicle without calif emissions reqd in NY anyway
The misfire counters are there they must be accessed
So the key is you have to ask does the vehicle have calif emissions on it to be sure that means
a simple way does he aft o2 sensors
or 3 o2 sensors
and a sticker on the core support for the radiator.
As far as things to look at
I would follow "Fredvons" suggestions
If the vehicle hunts for a certain Idle I'd go after the IAC circuit
Just because the cops resistance measure the same the fail or break down with heat (open winding).
Rich
On edit
If the vehicle does not have Calif emissions ,and is above the weight class you are correct,But I haven't ever worked on a vehicle without calif emissions reqd in NY anyway
The misfire counters are there they must be accessed
So the key is you have to ask does the vehicle have calif emissions on it to be sure that means
a simple way does he aft o2 sensors
or 3 o2 sensors
and a sticker on the core support for the radiator.
As far as things to look at
I would follow "Fredvons" suggestions
If the vehicle hunts for a certain Idle I'd go after the IAC circuit
Just because the cops resistance measure the same the fail or break down with heat (open winding).
Rich
Last edited by FortyFords; Aug 1, 2006 at 03:34 PM.
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Originally Posted by krewat
Be careful, the V10's, pre-05 are NOT OBD-II compliant, they are OBD-I. The ECM does not "sanity check" many of the sensors, and might not even care if a COP was obviously bad (primary circuit failure type codes).
Can you please qualify your comment? I am with Houndog101 here...that seems weird???It was my understanding that ALL vehicles since '96 had to be OBD-II compliant. See quote...
FAQ: Do I Have An OBD-II Vehicle?
Some 1994 and 1995 model year vehicles do have OBD-II. If your vehicle is 1996 or newer, U.S. federal law requires that all vehicles (cars and light trucks) sold in the United States must be OBD-II compliant. This includes all domestic (Ford, Dodge, GM, etc.) and import/foreign (Toyota, Honda, etc.) vehicles.
The sure-fire way to find out if your vehicle is OBD-II compliant is to look for the standard DLC (data link connector) that all OBD II vehicles have. It will be located underneath the driver's side of the dash.
Now, if your vehicle is 1996 or newer, you definitely have OBD-II. If your vehicle is older than 1996, the presence of the DLC may or may not indicate that you have OBD-II. To verify, look under the hood for a VECI label. The VECI label will indicate whether or not the vehicle has OBD II. Sorry, I don't have a photo of the VECI label.
LINK: http://www.obd-codes.com/faq/do-i-ha...ii-vehicle.php
Some 1994 and 1995 model year vehicles do have OBD-II. If your vehicle is 1996 or newer, U.S. federal law requires that all vehicles (cars and light trucks) sold in the United States must be OBD-II compliant. This includes all domestic (Ford, Dodge, GM, etc.) and import/foreign (Toyota, Honda, etc.) vehicles.
The sure-fire way to find out if your vehicle is OBD-II compliant is to look for the standard DLC (data link connector) that all OBD II vehicles have. It will be located underneath the driver's side of the dash.
Now, if your vehicle is 1996 or newer, you definitely have OBD-II. If your vehicle is older than 1996, the presence of the DLC may or may not indicate that you have OBD-II. To verify, look under the hood for a VECI label. The VECI label will indicate whether or not the vehicle has OBD II. Sorry, I don't have a photo of the VECI label.
LINK: http://www.obd-codes.com/faq/do-i-ha...ii-vehicle.php
_______________________________
2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
Originally Posted by biz4two
What? Can you please qualify your comment? I am with Houndog101 here...that seems weird???
It was my understanding that ALL vehicles since '96 had to be OBD-II compliant. See quote...
biz
_______________________________
2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s
Can you please qualify your comment? I am with Houndog101 here...that seems weird???It was my understanding that ALL vehicles since '96 had to be OBD-II compliant. See quote...
biz
_______________________________
2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s
Rich
If you go to the motocraft service site it explains where we get confused
Remeber some states didn't require cali emissions when purchased.
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
Originally Posted by FortyFords
Biz is that quote from a place on this site?
Rich
If you go to the motocraft service site it explains where we get confused
Remeber some states didn't require cali emissions when purchased.
Rich
If you go to the motocraft service site it explains where we get confused
Remeber some states didn't require cali emissions when purchased.
Thanks for the suggestion to visit the Motorcraft Service website. Reading the OBD System Operation Summary - Model Year 2003 pdf document has me SHOCKED!!! Holly cow...
Funny how they do not mention that info when purchasing the vehicle. I much rather have the OBD-II over the lame OBD-I for trouble shooting reasons.OBTW: I have not gone and checked my SD V10...so...still open there...
biz
_______________________________
2003 F250 SD SC 142" XLT FX4 V10 Auto 4x4 3.73s