Need help! I have a 98 Xjr with 101 thousand miles on it, I am currently having a issue with rough idling and very poor acceleration, shakes the whole car. The codes I am getting are P0300 random multiple misfire and P0136. I also sometimes get cylinder 4 5 and 8 misfire but not at the same time. I wonder if it’s the Fuel pump or Fuel injectors, I hope it’s not the injectors . If anyone can guide me in the right direction that would be very helpful. Is this common for the injectors to go out ?

 

First off, your car is 24 yrs old and I'm betting the odds are not in your favor that the maintenance record is know. It would be nice if you'd put in your location so we could get a better idea of the climate your operating in.
When looking up codes, start with Jaguar and then the code...example Jaguar P0136, this will give you a more precise response. Keeping a record of all your codes is very helpful to us when reporting scenarios such as this. One issue can cause the other codes.

What condition is your battery?...should be zero corrosion and holding 12.5+ volts engine off for at least 10 minutes, preferred overnight cold test. These cars are quite susceptible to battery drain.
When's the last time you changed the fuel filter?
Have you done a fuel pressure test? ...do you smell fuel?
What condition is your MAF?...have you cleaned it with a MAF only cleaner?
Have you checked/cleaned your part load breather? ...check for breakage as well.

 

Okay. I live in Atlanta I have recently changed the fuel filter on the car and also a whole bunch of other maintenance items. Fuel filter Supercharger oil, transmission fluid and filter, Oil pan gasket, valve cover gasket, and a fresh oil change. I have relatively new battery don’t smell any Fuel I will try do a fuel pressure test tomorrow. I will also try cleaning the MAF as well. I don’t have any cracks on the intake breather hose vent weird problem I’m having Thanks for the advice I will keep you posted

And for the code Jaguar P1316 do you know what it means ?

 

P0136 is a generic code (you can find its meaning if you Google), not shown in the Jaguar table. It refers to downstream O2 sensor which, in the Jaguar table appear to be P0137, P0138 and P0140 (see the attachment).

 

you probably mean 1316

check timing

 

Sorry my mistake P1316

 

Sorry code is P1316

 

I googled a bit code P1316 for you and found:
https://www.jaguarforums.com/forum/x...5-p1316-46195/
The third entry came up with a number of ideas, but that whole thread might be pretty helpful.

 

Did it do this before you did the cam cover gaskets? Might be as simple as you're actually getting misfires in the cylinders you've mentioned and maybe you've got bad plugs, bad coils or even they're just not seated correctly. Worth a few minutes to pull them, check the gap, cleam em and see if the issue goes away. Is it constant or intermittent?

 

Clogged fuel injectors Faulty / worn out spark plugs Faulty ignition coil or Faulty fuel injectors
would be the places I would look first. If you did not have the code prior to your work and it only
surfaced after, then you know which parts you may have affected by removal and replacement.
It could be something as simple as a wire not completely seated.

 

Have you or the previous owner upgraded the secondary tensioners. This sounds like a classic timing issue. Otherwise walk through Randy's list. Include a search for a break along the air tube to the throttle body; clean the throttle bore and plate; runs some good fuel system cleaner through a tank; clean the MAF and check broken pins at the connector. And if this started just as it turned cold, maybe a bad temperature sensor in the cross over pipe.

 

Thank you everyone for the helpful advice,
I recently went ahead and replaced the spark plugs and coil packs and that made the car run much better and turn off the check engine light. But after driving the car for a few miles the check engine light came back on showing random misfire I’m still in the number four and P1316 again. i’m gonna take it to a mechanic shop to see what they think about it but I think it might be a clogged injector. Does anybody know if it’s a common issue on this car for injectors to go out i’ll try some injector cleaner but I’ve already tried that in the past

 

It is not uncommon to have sticking fuel injectors. They can stick when close or when open. Not just Jaguars has this fault.

 

Just took car for a test drive today and under hard acceleration it starts cutting out power. I don’t know if those are signs of a sticky injector idk. At this point I’m thinking of selling the car

 

I decided to remove the panels near the fuel tank and found some weird wires that were stripped and connectors that don’t go together. Can anybody assist me and tell me where these go to?

 

About your suspected injector issue: Why don't you clean it, and see if it helps?
I just cleaned all my injectors. I removed the whole rail, then blew carby cleaner into the rail (blocking the extra openings), went thru every injector step by step (attaching 12V (9V might do)) and those injectors, which did not seem to be spraying perfectly (maybe it was only, because they were higher up on the rail), I removed and blew in carby cleaner individually while applying voltage... (PS: carby is Australian for carburetor)

 

How hard is it to remove Supercharger charge pipes to access the injectors or is there another way of accessing without removing the intercooler charge pipes?

 

The 4 stripped wires look familiar in that they're for the rear parcel shelf 6x9 sub speaker.
The connector - someone will have to confirm what that connects to in their boot/trunk, my car isn't with me to check. Possibly the inertia switch.
That final wire I think has something to do with transportation and remains unplugged once it's delivered to the dealer. A nothing wire.