I recently purchased a 2000 jaguar xjr supercharged and for a while I had no problems. After a couple months of driving it it started having file issues so I replaced both fuel pumps and she started working fine again. However not she makes a low clicking sound followed by and irregular idle. Checked the tensioners so I shouldn’t have any problems with that still the engine has about 87k miles. Now all of a sudden the check engine light went on and gives me a few trouble codes regarding random misfires on cylinders 1-4. Not so steady on the financial side so is there anyone that can help before I start blowing money where I don’t need to ???

 

What are the codes u have? Misfiring probably bad ignition coil since u don't want to spend more get eBay set its 99 $ im using it in my car works fine

 

the codes were 0300 - 0304

 

Short solutions Check for vacuum leaks and replace the ignition coil .

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where’d you get this pic from ???

 

DTC guide published by Jaguar.

 

https://www.docdroid.net/8xyI3V2/aj2...bd2.pdf#page=4

 

Thank you Motorcarman.....beat me to it

 

So ive taken out and replaced some parts on ny supercharger...twice... First time just the coupler everything else looked ok but still made weird rattling sounds so i operated again and changed the bearings at the back of the supercharger and put everything back and still theres the rattling -.- i dont know what else to do except changing rhe barings from the snout but ive already spent a lot of money in doing what ive done. Also still getting misfires but all coils tested same ohms and i can here all injectors firing at an even pulse.

 

Misfire 300-304 is essentially misfire cylinders 1-4 which are all on the right hand bank. Are you absolutely sure you don’t have a tensioner issue? If you haven’t already, you need to at bare minimum pull the passenger side valve cover (LHD car), pin the flywheel timing mark and check to see the flats of the 2 camshafts are aligned.

As far as the supercharger is concerned, if you replaced the coupler with a new stock Eaton one pictured below, then you obviously have another bearing issue. If you replaced your old spring loaded coupler with one of those cheap solid couplers like I did, then that’s definitely going to make it rattle. I’m not saying you don’t have a bearing issue if you used a solid coupler, I’m saying if you used a solid coupler then that’s the next item to replace with the one pictured below. https://www.ebay.com/itm/113841866230

 

Boomshacalac 97,
I’m a factory trained jag tech and the owner of a 99 Vanden Plas. Are there any other codes stored in the engine computer?

 

Yes I changed the coupler for the solid one so what your saying is it’s not good or that’s the only reason it’s still making a sound ?? Should I really put another spring loaded one considering that’s what broke ???

 

There’s a few codes but I moved some injectors around and I need to see if the codes moved with them or if they are still in the same place but I was originally getting p3007

 

Another thing to add I did check my timing chain and tensioners both sides good and clean and I do have a kit that I bought thinking that was my problem at first

 

Ok. P3007 is cmp sensor no signal. I don’t recall ever seeing that code in these jags and when I look it up vehicle specific, it says N/A. However, I would check the cam sensor connectors and wiring for each side if it has 2 cam sensors. The NA engines like mine only have the one if I remember correctly.

the timing chains don’t hardly go out on these engines. But the plastic body tensioners, if original, will leak and cause your low oil pressure light to come on. And the plastic on the levers and chain guides will start cracking and the plastic will begin to fall into the oil pan. Hang on to that kit. You might need it later. And if you do it then you need to take the whole front of the engine off and do the main drive components as well.

If moving plugs, coils, and injectors around has not changed where the misfire is then it’s time to check compression.

 

To make a very long story short, the solid coupler in my experience DO make the SC sound like a revolving bag of marbles. There is nothing to absorb the shock of multiple moving parts even at idle. With that being said, here’s some other ideas. If you get the Eaton coupler, I’d go ahead and get the rebuild kit for the snout. Take measurements before dismantling the snout to make sure the new bearings are exactly in the same place. Let’s say you rebuild the snout properly and install the Eaton coupler and get it back on the car. It may or may not be making noise at this point. If it still makes noise, it’s going to be the 2 main bearings that are housed at the front of the rotors. I have not changed those 2 main rotor bearings. It’s too risky for me to possibly break the bearing housing.

 

Thanks for your input I’ll be sure to check for codes again this weekend and give you guys the update and in terms of the supercharger coupler is hate to take the whole car apart again just to switch to the oem coupler style if I don’t absolutely need to. Is it just the sound or is that style coupler no good for the supercharger. In addition I did change those two bearings in front of the rotors they didn’t look bad but they came in the kit and I wanted to rule that out. The only thing I have left from the kit would be the snout bearings but I don’t have access to a press is there any other way of ruling that out ??? 22 living on a budget isn’t the best combo for owning a jag

 

And I will run a compression test just to see where I’m at

 

I believe your engine, being 2000 MY, has four wires to the coils. These coils have electronics inside and cannot really be tested measuring the resistances. As you get code P0304, you should swap the coil at cylinder A4 (see pic) with another coil and see if the trouble code move

s.