2005 XJ8L w 65k

A few months ago, the car suddenly went to limp mode with the restricted perfromance lights. I got the car home and the next day everything was fine. The codes were p0300, p0301, p0303, p0305, p1316. I cleared the codes and its been fine for the past few months. 2 days ago, it went to limp mode again, the same codes came back. I know its misfiring on those cylinders randomly. I'm thinking it may need new coils/plugs.

Is there anything else i should check before changing coils/plugs? I'd hate to spend the money on the coils and then find out it was a sensor or something else casuing the problem. Any help would be appreciated.

Ryan.

 

I had the same problems, replaced the coils and plugs and now its fine

 

How much do coils cost on the XJ, and are they easy for the shade tree mechanic to replace?

 

I had this same issue. The car would hesitate and was on restricted performance at higher rpms. Check engine light was on too. I had the codes read at Autozone and replaced the coil and spark plug for the affected cylinder myself. I ended up having a bad fuel injector which my local mechanic replaced. Car runs fine and check engine light went out on its own. Good luck.

 

This happened at 60K miles. Coil was around $80 and the fuel injector was around $65.

 

It was not the coils. I cleared the codes and changed some coils around to see if the problem would move, and i have not seen any misfire codes since; must have been bad gas.

However, i now have code p2135. Every few weeks the car goes into limp mode, with engine malfunction, dsc fault, park brake fault on the dash. When i turn the key to the number 2 position (right before the crank position) the lights are on the dash telling me of faults before the engine is running. It sounds like one of the throttle body sensors or the throttle body itself. Does anyone have any experience with this particular problem?

 

Sounds like a weak battery to me!

 

Actually, I checked the battery. I had it tested and they said there was nothing wrong with it.

I sprayed the connections and ziptied them really tight. Hopefully that will fix the problem and i can avoid the $8oo throttle body.

 

How was the battery tested? You can't get a proper test by attaching just a volt meter. It needs to be load tested properly.

"I sprayed the connections" Did you remove them and sand them down before spraying them with a protectant?

I hope you can avoid a throttle-body too!! Good luck.

 

There is info on this site about people who have had TB problems and found it was the connections to the TPS. New TB is the last resort.The TB can also be cleaned internally.

Cymru am byth!

 

I had this problem with rough engine running and restricted performance. I bought a couple coils from autopartsway dot com for 59 a piece. Trial and error unplugged each one till I found the bad one. Total cost $59 + a bar of soap to wash my hands

 

This past weekend, it happened again. During the beginning of a 240 mile trip, The lights came on and the car went into limp mode. I pulled over to check the TB connections; i unplugged them and plugged them back in. The car started fine and i finished the trip without problems.

I took the battery and had it load tested and it came back fine. Apparently my cleaning of the connections also did not work. What else can i do? It seems electrical; if the throttle body was bad, wouldn't the car consistently go into limp mode and not every other week for a few minutes?

Any help would be appreciated. It looks like i may have to shell out the money for a new TB after all.

 

Code definition for P1316 is as follows

Misfire Excess Emission (NOTE:This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306) (X-Type).

All codes seem to point to a misfire. Why do suspect the throttle body?

 

The misfire problem was resolved, but the car goes into limp mode every now and then. The misfire happened a few months ago, i asssume bad gas or something like that because those codes have not shown up since. The only code that has come up over the past few months is p2135.

 

How old is the battery? Did you have the charging system tested?

 

The battery looks like it might be the original battery. I don't have any record of it being changed. I am taking the car to a place today to have the charging system tested.

 

It could very well be the battery then. We have the same year car and our batteries are probably the same age. Changing mine fixed everything. They told me I should have changed it a long time ago.

 

If your have misfires, does it do it under heavy acceleration, If so I would check the long term fuel trim, if its over 7% I would start by cleaning the injectors. Number two I have seen the flywheel develop burrs on them, so the crank sensor doesn't read correctly. The flywheel will have to be deburred, with like a die grinder just lighty, you can do it without taking the trans out. Lastly, if all that is done and you still only get misfire codes, I would replace the plugs and coils.