Misfire problem
#1
#2
If you are having misfire problems the first is to get the codes read to see what is causing the problem and if the code reader will give you need the STFT (short term fuel trim) and LTFT (long term fuel trims.
I can give you a list of things that could be wrong and a list of parts to replace. In the end your wallet will be lighter and you may still have the problem without more info to diagnose.
I would recommend having the codes read and then post the numbers. We don't care about the readers generic definitions. The P0xxx will give us the Jaguar specific codes. Once they are read have them cleared and then later go back and repeat having them read and those are the numbers we need.
Some of the existing numbers could be old faults and not apply to the current problem.
I can give you a list of things that could be wrong and a list of parts to replace. In the end your wallet will be lighter and you may still have the problem without more info to diagnose.
I would recommend having the codes read and then post the numbers. We don't care about the readers generic definitions. The P0xxx will give us the Jaguar specific codes. Once they are read have them cleared and then later go back and repeat having them read and those are the numbers we need.
Some of the existing numbers could be old faults and not apply to the current problem.
#3
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#6
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#7
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#8
Most but not all code readers will give you fuel trims if you toggle thru the screens for information available. I am not sure if autozone's scanner will but it is worth trying.
I have looked at the codes posted and I am unable to locate a couple of the codes as being valid for Jaguar Specific OBD II.
The P1000 is the code for all monitors are not set and clear. It will change to P1111 all systems are OK once the malfunctions are cleared.
P0300 is random misfire this could be a lean condition due to vacuum leaks or a rich condition due to fuel circuit problems. Fuel trims would tell what is going on there.
P0313 is a generic code for lean condition and P0616 is generic for catalytic convertor problems.
First a quick questions did you change coils and plugs as routine maintenance or to resolve a misfire problem?
Did you reuse the intake manifold seals?
Did you torque the manifold to the tech manual value and in the tech manual sequence?
Did you have any problems with the removal of the brake booster line?
You need to tackle the problems one at a time first let's get rid of the P0303. Remove the #3 coil and plug (center rear) and swap it with the #4 coil and plug (center front). Run the engine and see if the misfire changes to a P0304. That will tell you the plug or coil is bad. While you are doing this check the wires for #3 for cracks, heat damage or corrosion and correct anything found.
Once we solve that we can dig into the random misfire and possible lean condition. It is going to be a slow process but we will get you there.
I have looked at the codes posted and I am unable to locate a couple of the codes as being valid for Jaguar Specific OBD II.
The P1000 is the code for all monitors are not set and clear. It will change to P1111 all systems are OK once the malfunctions are cleared.
P0300 is random misfire this could be a lean condition due to vacuum leaks or a rich condition due to fuel circuit problems. Fuel trims would tell what is going on there.
P0313 is a generic code for lean condition and P0616 is generic for catalytic convertor problems.
First a quick questions did you change coils and plugs as routine maintenance or to resolve a misfire problem?
Did you reuse the intake manifold seals?
Did you torque the manifold to the tech manual value and in the tech manual sequence?
Did you have any problems with the removal of the brake booster line?
You need to tackle the problems one at a time first let's get rid of the P0303. Remove the #3 coil and plug (center rear) and swap it with the #4 coil and plug (center front). Run the engine and see if the misfire changes to a P0304. That will tell you the plug or coil is bad. While you are doing this check the wires for #3 for cracks, heat damage or corrosion and correct anything found.
Once we solve that we can dig into the random misfire and possible lean condition. It is going to be a slow process but we will get you there.
#9
Thank you so much for taking the time to walk me through this I'll do the wrench work tonight and the fuel trim tomorrow after work and recheck the codes and I'll let you know what I get figured out I'll download the manual pdf for tourqe spects and correct sequence for bolts and grab a gasket kit to replace the old ones I'll do my best to tackle the list of things you said to do I'll check in with you tomorrow evening ok and again thank you your awesome man
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