Dad has loaned me his Jaguar while he was on vacation. He has wrestled with a problem for a while and I would love to solve it for him before he gets back. He loves his Jag and I think its an awesome car but this issue is ruining the Jag experience for him.

I used it to drive around town the car drove very well plenty of power and I was quickly impressed with it. Then in the evening I dropped off a coworker of at the hotel and the car had an issue idling and the check engine came on.

I had a code reader bought torque for my tablet and pulled the codes.

Fault log report generated by Torque for Android
=================================================
Vehicle VIN: SAJWA79C35SG45657
Vehicle Manufacturer: Jaguar
Vehicle Calibration ID: Not present
Current Fault Log
------------------
P0300: Random/Multiple Cylinder Misfire Detected
P0301: Cylinder 1 Misfire Detected
P0303: Cylinder 3 Misfire Detected
P0305: Cylinder 5 Misfire Detected
P0306: Cylinder 6 Misfire Detected
P1316: Unknown code - More information may be available on the web
Pending Fault Log
------------------
P1000: [Ford] OBD-II Monitor Testing Incomplete
[Mazda] OBD II Monitor Testing Not Completed
Historic Fault Log
------------------
ECU reports no historic faults
Other discovered fault codes
(possibly pending, current or manufacturer specific)
----------------------------------------------------
ECU reports no other fault codes logged

I erased the codes in the morning and drove out the next day. Car ran well then we pulled into a customer and after 30 minutes restarted the car. It hesitated ran like it had bad coils and hard a hard time idling. I tried to gas it it stumbled. I restarted it and then logged and erased codes. It ran Ok and then stumbled later and the check engine light came on again.

I stopped the car and erased the codes and it drove fine again.

the starting issue feels like bad coils, but clearing the codes restores the drivability. then out of the blue the check engine light comes on and it looses its HP it feels more subdued. The intermittent nature of the problem and the worst symptoms upon restart concern me.

Things I believe my dad has tried is replacing the mass air flow sensor and checking for leaks on the intake. I also believe he has tried to seal the engine oil dip stick with a new seal.

He probably hasn't reached out to the community but I was hoping someone could lend give me a little advice.

The exact same fault logs come back I just checked the two I saved and they are identical and I erased these codes a couple of times.














old and new, both a beautiful,

 

2005 XJ8L car with issue.

 

https://www.jaguarforums.com/forum/x...-issue-154370/

I just ordered a will install this weekend.




what I ordered so I hope it is the solution. I will let you know.

 

If the new EGR valve does not solve the issue you could try swapping some coilover packs. If a cylinder that was originally good now misfires with a pack from a cylinder that had a misfire you know that it is a coilover pack.

 

I just diagnosed a coil issue on my Acura TL. The whole car ran terribly. What I did was let the car idle and one by one unplugged the connector to the coil. When the engine ran worse I knew the coil was good. When the engine didn't change, then I knew that the coil with no negative effect was bad. I swapped coils to make sure it wasn't the wiring and then replaced the suspect coil. swapping the bad coil completely solved my issue on the Acura.

I am hoping the part I ordered is the pcv valve. I am trying to replicate the fix on the referenced threads. he had the same codes and similar issues. he referenced an PCV valve and I am assuming I ordered the correct part?

resetting the ecu should not change the function of the coils. If the coil fails no resets should get them working. I assume.

 

I said EGR valve I meant PCV!

 

The torgue AP gives you live feedback.

 

changed the PCV and it runs perfectly. Smooth power, a really nice car to drive. I don't have any news but to say there is no news.

Until the check engine light comes on its fixed.

I think if there is a starting issue it is probably due to an old battery. I could see an old battery causing issues like I had. The driving, idling issues that created a check engine I have to believe were related to the PCV.

I am going to return the car not say a word and assume its resolved.

 

Trying to talk the wife into driving a trophy wife car full time. To be a proper suger daddy I have to have the wife in a Jaguar. unfortunately she's not a Jaguar girl ....yet! she doesn't like the attention.





remove cover and replace the PCV on left side of picture. two screws disconnect vent line. quick replacement.

 

Drove it all over and no codes!!! Driving it to Oregon this week for a final inspection.

 

Is that PCV valve suppose to free flow both way or suppose to be one way valve when blow thru?


Took mine out to clean and it is free blow thru both way.

 

Mine blew both ways, the old one had quite a bit of oil in the engine cover side.

Don't know how the pcv could fix It but the codes stopped afterwards.

The other thread it fixed his situation as well?

 

Another quick question, will that valve rattle if you shake it when brand new? I can see some kind of spring inside and no rattle even after cleaning it.


Thanks.

 

I should give an update, I honestly don't know what the internals do. no rattle and I could blow in both sides.

I have an interesting situation, as soon as the aforementioned codes went away these started up.

Fault log report generated by Torque for Android
=================================================
Vehicle VIN: SAJWA79C35SG45657
Vehicle Manufacturer: Jaguar
Vehicle Calibration ID: Not present
Current Fault Log
------------------
ECU reports no current faults
Pending Fault Log
------------------
P0171: System too Lean (Bank 1)
P0174: System too Lean (Bank 2)
P1000: [Ford] OBD-II Monitor Testing Incomplete
[Mazda] OBD II Monitor Testing Not Completed
Historic Fault Log
------------------
ECU reports no historic faults
Other discovered fault codes
(possibly pending, current or manufacturer specific)
----------------------------------------------------
ECU reports no other fault codes logged
End of report

Then my father while driving the car watched the live data and noticed there was no signal for the bank one O2 sensors. The second after Cat ones were giving readings just fine.

He is going to replace the header O2 sensors before the Cat and see if this issue goes away.

I have checked for leaks around the intake and replaced the air line off the throttle body,( small thin) 3/8 or something like that.

I cannot find an intake leak and with no voltage readings on the bank one O2's, the best guess to the current issue ( probably related) is the O2's.

 

Yes, it will rattle

 

The solution was the car had an original battery in it. After 11 years it gave up the ghost. A new Bosch battery was installed. It was driven vigorously and gets great gas mileage and runs perfectly.

I have seen other threads regarding this solution,

How to detect if your issue may be a bad battery candidate?

My issue went from bad PCV valve to intermittent bank sensors ( both) within a minute of each other and did not register together.

The car was acting strange and not a logical pattern. Two different code groups unrelated and popped up rite after the other was resolved.

Just keeping you in the loop, this pain and displeasure with jaguars caused by a battery.

I was looking at jags but instead went and bought my daughter a Chrysler 300 instead. I just didn't like the gremlins. I was going to buy a later model 300 for me but now perhaps I will take another look.

Hard to beat the value of a used jaguar if its reliable.

 

"Hard to beat the value of a used jaguar if its reliable."

I don't dare to own one unless I have an extended bumper to bumper aftermarket warranty. The suspension issues alone pays for the cost of the warranty