2000 XK8, 81K

The last few times I've taken the car out, I get a Restricted Performance (amber) light on. When it appears, while driving, I mash the gas pedal, to the floor, quickly, about five or six times , the light goes out, and it runs fine. The check engine light remains on, but it seems to run fine, until the next time ( when it comes up to temperature). Anyone else run into this issue?

 

Read the OBDII codes and report them here for further assistance....

 

Sorry, I don't have a proper Jaguar code reader. I've tried going to my local auto parts store for another code issue, and the codes were all wrong.

 

It sounds like a throttle position sensor problem. A generic reader should read the relevant codes, but if you use local store bring the codes here, don't use their interpretation.

 

Are you referring to this?

 

Have someone plug into the OBD port and read the DTCs for you. Post them here for assistance with diagnosis.

Under no circumstances is the vehicle to be operated under conditions that cause the MIL to flash as catalyst damage is occurring.

 

I think I'm just going to buy one. Is there any particular feature I should look for?
Thanks

 

There are several Bluetooth readers that work with the Torque app on a mobile phone. You can probably find a suitable one on eBay.

 

Do note that some Bluetooth dongles are not compatible with iOS, only Android and Windows; that may not be a problem for you specifically, but it's something to keep in mind when buying one. Others that communicate via Wifi are iOS compatible.

 

Bought a code reader.
Faults in order
P0302
P1313
P0352
P1111

I was under the impression these "generic" codes weren't relevant to Jaguar because they used a proprietary code reader etc. The P01313 and P1111 are exceptions, I think.
If I'm reading this right, I have one bad coil, one bad cat and #2 cylinder is a misfire. To be honest, I don't think any are valid (especially the cat and coil) and have anything to do with my issues. The misfire is from me mashing the throttle to get out of limp mode. But, I'm probably wrong.

 

P0302 Misfire detected – cylinder A2 (2)
P1313 Misfire rate catalyst damage A bank (1) NOTE: This DTC will flag only when accompanied by an individual cylinder misfire
P0352 Ignition coil (A2) primary / secondary circuit malfunction

Potentially you have a dead coil, no spark, and causing cat damage - I would replace, or at least swap the suspect one to a different cylinder and see if the code follows it.

 

Perhaps, but I don't think so. The reason I say that is, the car only goes into limp mode when it's hot outside and it gets up to temperature. Prior to that, it runs great. As soon as it goes into limp mode, I mash the gas pedal about 10 times to the floor, it spits and farts, then the light goes out and it runs great again. I suspect the misfire is from me flooding gas into cylinders that have been shut down during limp mode, then refiring causing a unburnt fuel to ignite in the cat, hence the P1313 code.I also suspect something in the throttle body, but can't seem to record a specific code - which leads me to another point, the TV show, Wheeler Dealer had the exact same issue on a 1999 XK8 and they mentioned in the episode, they had to bring the car to a dealer because a standard code reader wouldn't provide them with proper coding. Their remedy was to replace a faulty throttle body, (bad sensors) with a used unit. Problem solved, for them at least. I've seen sensors now available on Ebay and thought if I could get a proper code I'd know which one. Someone earlier mentioned a Throttle Position Sensor, which makes sense, however, again, I'm not throwing any codes, at least on my generic OBD2 reader that would indicate that.
https://wheelerdealers.oldtvepisodes...pisode/s09e07/

 

I'd either fit a new #2 coil or swap it and see if the fault moves - but it's damaging the cat so a new one looks wiser.

Don't continue do what you're doing unless yo want to replace the cat.

It could be wiring, could be the plug, but is usually the coil.

 

Today, I cleared out all the codes.hoping I could replicate the issue without the "gas pedal mashing". I did. Once again, I started the car, in a cool garage, it fired up, no limp mode. I brought it up to temperature and shut it off to sit in the hot sun. I restarted it - Restricted Performance comes on at idle. I shut it off and read the codes. The codes now are:
P352
P1000
I

 

I swapped out the #2 coil - a cheepo that I bought on Ebay but never installed, and the only code I have now is P1000. The issue had been intermittent, but for now, it's running fine.

 

Spoke to soon. Again, the car sat out in the sun. Started it, ran a little rough, then as I'm driving Restricted Performance Amber light. No check engine light either. However, the car didn't go into limp mode and about 1/2 mile later, the light went out. I ran a code check and received:
P302
P303
P305
P1316
P1000
Any help is greatly appreciated. This is frustrating as hell.

 

Have you checked the general area of these coils/plugs? A failed valve cover gasket can flood these areas with oil and cause misfire...

 

Yes. Under the cover looked clean and dry - actually, almost new. I've started a few times and made a few short runs down the road and no restricted performance and when I checked , again, the codes, the only one I'm getting is P1000 (which is, I believe, waiting to complete a cycle) I'm still suspecting the throttle body because when it starts on a cold day, it idles at about 1200 rpm then settles down to about 700. When hot, it goes right to 700 and idles a little rough until I get going. Also, now I'm noticing the smell of gas. Never did that before.

 

It's misfiring i.e. not burning air/fuel mixture properly, thus the smell.

Cheap coils - not for me.

Just in case you replaced the wrong coil you'd expect the same code as before plus maybe one if the new coil is bad.

Still could be the other items.

 

If the problem is spreading to more cylinders, then obviously potentially more general. A couple of things to check could be fuel pressure, and battery/grounding since bad power can trigger random codes like lighting up a Christmas tree.