I wanted to post my experience with multiple (9!) codes and my resolution. Just an FYI.

I received the following codes all at once and the car started running like crap:
P0101 - MAFS
P0300 - Random multiple misfires
P0304 - Cylinder 4 misfire
P0305 - Cylinder 5 misfire
P0308 - Cylinder 8 misfire
P1000 -
P1313 - (Don't remember exactly, misfire and catalytic converter)
P1314 - (Don't remember exactly, misfire and catalytic converter)
P1316 - (Don't remember exactly, misfire and catalytic converter)

I was afraid there was some serious engine/cam damage. I did some research here on the forum and most people seemed to think the problems were related to bad fuel, fuel filter, fuel pump.

I took my Jag to an experienced Jag mechanic and it turned out that 2 coils went out at the same time, and the other coil threw codes, but then was OK. I was skeptical of 2 coils going out at once so he took me back to the shop and showed me the coils with no spark, and the one that threw codes that was sparking strong.

He replaced the 2 bad coils and reset the codes and the car ran perfectly. Even the MAFS code cleared. No more problems. I have heard many stories about coils all failing at about the same time (withing a year or 20,000 miles) but not at the same moment like that. Being OCD like I am, and since we were traveling, I went ahead and replaced the other 6 coils myself so I wouldn't have anymore problems.

I just wanted to share this experience that there is an alternative to fuel problems.

 

Fitz,

Thank you for your report. For the benefit of others who may have similar problems, could you please share with us which brand of coils you purchased?

Thanks,

Don

 

I bought Duralast coils from AutoZone. $42.00 each. They have a lifetime warranty. The OEM ones from Jag that the shop installed were $107 each.

 

Did you happen to note the brand of the OEM coils? Are they made by Denso or were they marked FoMoCo?

Thanks,

Don

 

I did not notice.

 

On my way to happy hour after work I noticed the car idle going to ****. The engine light came on and at times was flashing... continued to happy hour, made myself happy and drove home. I just put in the shop and read the codes using my OBD Link software

P0300 Random/multiple misfires
P0305 Cylinder #5 misfire
P1313 Misfire/catalyst damage
P1316 Misfire

Also pending are the following codes not already confirmed:

P0304 Cylinder #4 misfire.

I will do further diagnosis and report back.

 

I have a 4 new coils in Jaguar packaging, Part# AJ810445, the Jaguar label states "Made to Jaguar Specification in Japan". the plastic coil case has "FoMoCo" and "NDO4G"embossed on one side and "6R83-12A366-AA099700-1120 on the other side.

 

I swapped the coils between cylinders #5 and #3, cleared the codes and restarted the car. The engine miss was there and before long, a pending P0303 code was logged. This essentially resolved the troubleshooting session.

Since I did not want to wait for days to get parts, I went to the local AutoZone store and got a Duralast (also known as Neverlast) coil with lifetime warranty. I popped it in, cleared the codes and test drove it. Problem resolved for now.

All the coils in the car are the original Denso coils. I had replaced all the spark plugs some time back.

The good thing about this is that the coils are fairly easily replaceable. If another one goes out, I will probably replace all of them with Jag quality coils.




Original coil to the left and the Duralast to the right

 

Six Rotors,

Thank you for that information! I have been wondering what coils Jaguar is supplying now that the original Densos appear to no longer be available, and you have confirmed my suspicions.

The coils you describe are identical to the Airtex/Wells 5C1420 coils, which are likewise marked FoMoCo (Ford Motor Company) and with the same part numbers as your Jaguar-boxed coils. The Airtex/Wells-boxed coils are available from Rock Auto and are currently priced at $31.79 each, compared to the Jaguar price of $107.00 each for the same coil.

Airtex/Wells is a major OEM to Ford, GM, Chrysler, etc., thus the FoMoCo molded into the coil body.

Thanks again for your very helpful report and for confirming what I had come to suspect!

Cheers,

Don

 

It is even more interesting than that--I bought them about 3 years ago and they came in SMP part# UF519 boxes,with Jaguar packaging inside and I paid $36US each delivered.

 

That really is interesting, because when I first needed coils, I ordered one each of the Airtex/Wells, Standard Motor Products (SMP), and Beck/Arnley to compare them to the OEM Densos. The SMP and Beck/Arnley coils I received appeared to be identical, and of good quality. But they were not the same as the Airtex/Wells, which was marked FoMoCo like yours, so that was the one I kept and ordered more of.

Cheers,

Don