misfire and stutter going crazy!!
#1
misfire and stutter going crazy!!
Im going mad here,
quick run down, paid in full for my s type 4.0 v8 2002 3 weeks ago took delivery of it and instantly noiced misfire on tick over. Brought it home and noticed at 45 mph exactly in top gear at 2000 rpm it was stuttering/juddering rocking me back and forward like a 2 stroke when cold spluttering.
Took it back the next day and havent seen the car since.
Its been to 3 different garages and nobody can diagnose the fault.
They found a rocker cover gasket leaking into the spark plug wells, so they replced gasket and spark plug seals, and im not 100% sure but i think they replaced 3 coils? Like i said not sure.
Replaced the fuel filter, tomorrow it is going to a 4th garage who is a jaguar specialist but im slightly worried.
Any ideas would be great
Darren
quick run down, paid in full for my s type 4.0 v8 2002 3 weeks ago took delivery of it and instantly noiced misfire on tick over. Brought it home and noticed at 45 mph exactly in top gear at 2000 rpm it was stuttering/juddering rocking me back and forward like a 2 stroke when cold spluttering.
Took it back the next day and havent seen the car since.
Its been to 3 different garages and nobody can diagnose the fault.
They found a rocker cover gasket leaking into the spark plug wells, so they replced gasket and spark plug seals, and im not 100% sure but i think they replaced 3 coils? Like i said not sure.
Replaced the fuel filter, tomorrow it is going to a 4th garage who is a jaguar specialist but im slightly worried.
Any ideas would be great
Darren
#2
It's more likely someone with the actual car will diagnose it than any number of us on the net!
Sounds like misfires but could be failing cats or any number of other things, even a failing battery or bad connections to it that vibrate loose.
edit: this isn't going to help but lots of cars can have similar symptoms (quite rare for any car) and are equally hard to diagnose. What helps are faults that throw codes but not all faults are so helpful
Sounds like misfires but could be failing cats or any number of other things, even a failing battery or bad connections to it that vibrate loose.
edit: this isn't going to help but lots of cars can have similar symptoms (quite rare for any car) and are equally hard to diagnose. What helps are faults that throw codes but not all faults are so helpful
Last edited by JagV8; 11-28-2012 at 02:41 PM.
#3
theanks jagv8, im under the impression this jaguar specialist where the car is heading tomorrow has all the correct diagnostic equipment, just seems to be a very common problem with these 4.0 v8 s types,
what baffles me the most is that 3 other mechanics/garages have failed to diagnose the problem, but like you say the proper diagnostic equipment help, but then i have read time and time again sometimes these v8s dont throw up any fault codes, which really is what i dont want to hear!
One thing to add just before i took delivery of the car the dealer replaced th ebattery because the original was dead, howeve they replaced with with one they got from Hendy ford truck garage, now Hendy told them battery is more than powerful enough, but its half the size!
what baffles me the most is that 3 other mechanics/garages have failed to diagnose the problem, but like you say the proper diagnostic equipment help, but then i have read time and time again sometimes these v8s dont throw up any fault codes, which really is what i dont want to hear!
One thing to add just before i took delivery of the car the dealer replaced th ebattery because the original was dead, howeve they replaced with with one they got from Hendy ford truck garage, now Hendy told them battery is more than powerful enough, but its half the size!
#4
The following users liked this post:
darren-talbot (11-28-2012)
#5
The following users liked this post:
darren-talbot (11-28-2012)
#6
That's a big +1 on that small battery. Same thing happened to me - had an Interstate battery (1/2 the size) installed - it was ok in the beginning but the electric demand fried 2 of the 6 cells in the battery. I went with the Bosch battery - same class and size as OEM with a bigger punch - what a difference.
But, besides the battery that may be a contributor to the issues... I believe you are suffering from one or more misfiring coils...As far as to how to isolate the misfiring - a COP (Coil On Plug) tester will help you diagnose which coil(s) are acting suspect. Also, if you need to replace coils - go with OEM Jaguar or OEM Ford - Motorcraft Coils - all the other aftermarket coils suck...Good Luck.
But, besides the battery that may be a contributor to the issues... I believe you are suffering from one or more misfiring coils...As far as to how to isolate the misfiring - a COP (Coil On Plug) tester will help you diagnose which coil(s) are acting suspect. Also, if you need to replace coils - go with OEM Jaguar or OEM Ford - Motorcraft Coils - all the other aftermarket coils suck...Good Luck.
#7
That's a big +1 on that small battery. Same thing happened to me - had an Interstate battery (1/2 the size) installed - it was ok in the beginning but the electric demand fried 2 of the 6 cells in the battery. I went with the Bosch battery - same class and size as OEM with a bigger punch - what a difference.
But, besides the battery that may be a contributor to the issues... I believe you are suffering from one or more misfiring coils...As far as to how to isolate the misfiring - a COP (Coil On Plug) tester will help you diagnose which coil(s) are acting suspect. Also, if you need to replace coils - go with OEM Jaguar or OEM Ford - Motorcraft Coils - all the other aftermarket coils suck...Good Luck.
But, besides the battery that may be a contributor to the issues... I believe you are suffering from one or more misfiring coils...As far as to how to isolate the misfiring - a COP (Coil On Plug) tester will help you diagnose which coil(s) are acting suspect. Also, if you need to replace coils - go with OEM Jaguar or OEM Ford - Motorcraft Coils - all the other aftermarket coils suck...Good Luck.
I agree on absolutely all counts. My money bets verifying the coils they replaced are genuine, and replacing the rest accordingly will likely fix this car. Then make sure the plugs are correct and not eroded to a wider than normal gap. That will make sure it doesn't happen again soon.
Good luck!
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Let's see is a tech can chime in here...
#14
Thanks guys for your help.
The car is with s&c in hamble Southampton. And my 1st impression us that they know what they are doing as 3 other garages couldn't find a fault. And Sean found it in under a hour. So I'm taking comfort in the fact I'm sure they won't let the car go out of the workshop with internal damage etc. plus I still have 6 month warranty.
Still would be Interested in what a tech has to say.
The car is with s&c in hamble Southampton. And my 1st impression us that they know what they are doing as 3 other garages couldn't find a fault. And Sean found it in under a hour. So I'm taking comfort in the fact I'm sure they won't let the car go out of the workshop with internal damage etc. plus I still have 6 month warranty.
Still would be Interested in what a tech has to say.
#15
You beat me to it!! I was going to suggest tensioners too!!
If it only jumped one tooth you might be alright. Several people have had this happen with no piston/valve contact. But first pull the plugs and use a borescope to see if the piston is all banged up or not.
It's a pretty big job to change them. We have several sets of nice instructions in the sticky section. They are quite a bit better than the JTIS instructions with pictures and hints.
Please see attached.
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If it only jumped one tooth you might be alright. Several people have had this happen with no piston/valve contact. But first pull the plugs and use a borescope to see if the piston is all banged up or not.
It's a pretty big job to change them. We have several sets of nice instructions in the sticky section. They are quite a bit better than the JTIS instructions with pictures and hints.
Please see attached.
.
.
.
#16
You probably got lucky! If the slipper can get off the tensioner without breaking the chain, that's lucky strike number one. If it can get out and not jump more than a tooth or two, that's lucky strike number two.
If they can run a cylinder leakage test and pass all eight cylinders, that's lucky strike three, and you're outta there....... cheap. Not everyone is so lucky.
Good luck, and let us know how it goes.
If they can run a cylinder leakage test and pass all eight cylinders, that's lucky strike three, and you're outta there....... cheap. Not everyone is so lucky.
Good luck, and let us know how it goes.
Thanks guys for your help.
The car is with s&c in hamble Southampton. And my 1st impression us that they know what they are doing as 3 other garages couldn't find a fault. And Sean found it in under a hour. So I'm taking comfort in the fact I'm sure they won't let the car go out of the workshop with internal damage etc. plus I still have 6 month warranty.
Still would be Interested in what a tech has to say.
The car is with s&c in hamble Southampton. And my 1st impression us that they know what they are doing as 3 other garages couldn't find a fault. And Sean found it in under a hour. So I'm taking comfort in the fact I'm sure they won't let the car go out of the workshop with internal damage etc. plus I still have 6 month warranty.
Still would be Interested in what a tech has to say.
The following users liked this post:
darren-talbot (11-29-2012)
#17
ok, so when i get the car back is there anything i shoud be looking for or listening for?
The problem is i will NOT be collecting the car from the garage who are carrying out the work i will be collecting it from the dealership i purchased it from and we all know they know nothing about mechanics as it were lol..
The problem is i will NOT be collecting the car from the garage who are carrying out the work i will be collecting it from the dealership i purchased it from and we all know they know nothing about mechanics as it were lol..
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