Hello dear forum,

I am the proud owner of a 2014 Jaguar F-Type V8S and have been reading here with interest for some time.
Unfortunately, I have recently started having problems with the Jag. Mostly after about 10-30 minutes of driving, the engine starts to jerk and runs out of round with the cylinders switched off. The check engine light also lights up and flashes. I then avoided further driving on as much as possible. As soon as I switch off the vehicle and let it rest for a few hours, everything runs normally again as if nothing had happened. Sometimes I can even drive for an hour without any problems. The bad thing is that the problem occurs sporadically and not always. The fault comes on suddenly. It doesn't matter whether I'm driving aggressively with full trottle or calmly.

The following error codes occur during these misfires:
- P02F2 - Electric Circuit Injector #5
- P0300 - Random Misfire
- P0302 - Misfire Cylinder #2
- P0305 - Misfire Cylinder #5
- P1315 - Persistent Misfire

I have been to an authorized Jaguar workshop for this problem and they have carried out the following diagnostics:
- Catalytic converters have been checked and are OK
- Compression - also OK
- Timing checked and compared with new engine. These are also OK and the chain is not elongated
- Lambda sensor for both cylinder banks removed and installed

When the mechanic did a test drive, nothing could be found. The engine ran perfectly and the car was returned as faultless.

The spark plugs were replaced last year.

I have spent the last few days trying to find the cause of this problem and could not find a clear solution. The most obvious guess is faulty fuel injectors. Somehow a known issue with the AJ133 engines. However, some forum members with similar symptoms have reported that replacing the injectors has not helped. They also switched the coils, which unfortunately didn't help either. I would be reluctant to replace working parts and would therefore like to ask you for advice from people who have had an identical or similar case. After describing the cause of the fault, can someone confirm that it is most probably the injectors?

Many thanks in advance for your help!

Kind regards
Prodonn

 

All symptoms are consistent with a faulty injector. I think that's a good candidate for the cause. I'd carefully check the wiring harness to injector #5 first. Problems that appear/disappear like you describe are often traced to bad connectors in the wiring harness. I just had this issue with my fly-by-wire throttle, bad connector gave occasional codes and errors.

 

Thanks for your feedback. I'll order parts to change all the injectors and give an update after repair. Hopefully they won't be sitting to strong in there

 

Check the wiring as suggested before spending money on parts!

 

I had a bad spark plug wire that acted up when it wanted to. They were eight years old. Replaced all of them.

 

So were they corroded or how did you find out, it was the wiring?

Did you had the exact same issues and DTC Codes as me?

 

That should've done the workshop already, when they checked and tightened the coil packs.

The car has rarely been used. Only 49k Miles after nearly 11 years and was sitting all winter long in the garage. I'll send an update after the Injector replacement.

 

My mech. had a scope that could read every spark plug wire and identify which one was bad. He said don't get cheap and only replace that the bad one.

 

Something weird happened today again. I switched the coil and spark plug of cylinder 5 and 7. I could drive some minutes without issues as mentioned earlier. While driving without issues I had the error code P0013 but no check engine light. I checked alle the connectors and everything was plugged in.

After turning off the car two times for some minutes I received the same codes as in my first post including the shaking motor again. P0013 was gone since then.

Any solutions for that? Is it something electronically or should I stick with the next step to change the injectors?

 

UPDATE:

I have now changed all the injectors. First I changed the one from bank 1, as I suspected that it was only injector 5. After the same error occurred again, I also changed the one from bank 2.

Fortunately, there have been no more misfires since then and the car is running perfectly again

That was a hell of a job. I literally slashed my skin and destroyed my hands when I knocked out the injectors. It's unbelievable that the ingress of water from the bonnet vents causes them to rust so badly after 10 years. The most difficult was injector 4, which I had to pull out with tensioning straps. Thank God none of them broke off in the engine block.

Next, I will seal the engine so that no more water can get in.

 

Just to clarify….the problem was with fuel injectors as suggested in #2 above? I did experience a faulty injector on my v6s some years ago, the only indication being a steady CEL. My dealer diagnosed a faulty injector and wisely decided to replace all injectors on that bank. No problem since.

 

Yes, i changed all 8 Injectors. All of them were pretty clogged, dirty and rusty.

So when you already do the job, change them all and you'll be free of misfiring issues regarding to injectors in the future. It's not so common here in the US, but i checked facebook and there are dozens of posts of stuck and defective injectors in the UK. There are even companies who specialized in removing Jaguar / Land Rover injectors.

I'm not sure why i still had the same issues, when i changed all the injectors on bank 1. Especially the shown as faulty Injector #5 (passenger Side US) with error code P02F2. I've read somewhere else, that these injectors have a piezo technique inside and sometimes malfunction only when hot. My guess is, that more injectors also on the other bank were not ok and sent mixed signals to the ECU.