4.0L Intermintant Misfire - No codes
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4.0L Intermintant Misfire - No codes
I have a 2000 S-Type with 68,000 miles 4.0L. There is a intermintant misfire. I hooked up my scanner and looked at the misfire monitor and it shows "0" misfires. This problem has been happening for the last two months. The check engine light does work, but is not "on". I don't want to throw eight coils into this if there could be another problem. I am a Ford trained dealer technician and have never had a misfire symptom that would not show up as a misfire. I talked to a guy who had a simular symptom and he had a timing chain/tensioner issue. Is this a possibillity??[:@]Any help would be appricated.
Thanks
Steve
Thanks
Steve
Joined: Mar 2008
Posts: 2,521
Likes: 71
From: Powell, Ohio U.S.A. 43065
RE: 4.0L Intermintant Misfire - No codes
Hey Steve,
This might sound stupid, but that's the way your car is acting. Try pulling something and see if you can read a code...MAF, whatever...just to make sure you are getting good info. There's one guy on here (XK8)who has an OBD socketthat he can't read. Also, if you are using your Ford WDS/ IDS,you need Jag software to read the car. Even basic OBD codes might not be recognized. Most other generics should work, though. Hope your suspicion is premature, but....
This might sound stupid, but that's the way your car is acting. Try pulling something and see if you can read a code...MAF, whatever...just to make sure you are getting good info. There's one guy on here (XK8)who has an OBD socketthat he can't read. Also, if you are using your Ford WDS/ IDS,you need Jag software to read the car. Even basic OBD codes might not be recognized. Most other generics should work, though. Hope your suspicion is premature, but....
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RE: 4.0L Intermintant Misfire - No codes
That's a good idea. I will disconnect the MAF and see if it sets a DTC. I can read serial data so I figured it would read a misfire code. Is it possible this could be atiming chain/tensioner issue with 68,000 miles??
Steve
Steve
Joined: Jan 2008
Posts: 303
Likes: 2
From: Georgia
RE: 4.0L Intermintant Misfire - No codes
kind of doubt it being an intermittent fault
coils much more likely
do you have accesss to GDS 510 handheld
only tool im aware of that will have misfire monitor for 00 to 02 stype is the GDS
speaking from experience
coils much more likely
do you have accesss to GDS 510 handheld
only tool im aware of that will have misfire monitor for 00 to 02 stype is the GDS
speaking from experience
Joined: Jan 2008
Posts: 303
Likes: 2
From: Georgia
RE: 4.0L Intermintant Misfire - No codes
if it were a constant mifire you would have a misfire code
00 to 02 intermittent misfires dont show up on these cars as the 03 and later ones do
00 to 02 intermittent misfires dont show up on these cars as the 03 and later ones do
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RE: 4.0L Intermintant Misfire - No codes
It looks like I may have to do all eight coil's. If I take it to the Jaguar dealer they may not be able to read the code because the Check Engine light is not on indicating a code is set. If the misfire monitor does not pick up intermintant misfires then it seems the best thing to do is replace all eight coils with the high failure rate that I hear they have. I was concerned that this maybe a Chain/Tensioner issue so I did not want to start replacing coils if that is not where my problem is.
Steve
Steve
Joined: Jan 2008
Posts: 2,961
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From: 33498
RE: 4.0L Intermintant Misfire - No codes
If you work for Ford dealer, you can get the coils at half what we have to pay...lol
S-Type tensioners are not that common. I would start with coils. May want to check the plugs too....maybe oil soaked of cam covers are leaking.
S-Type tensioners are not that common. I would start with coils. May want to check the plugs too....maybe oil soaked of cam covers are leaking.
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