Hello to all!

1997 XK8 convertible with 135K on her. Recently, I've had a few episodes where the engine fault and restricted performance lights come on with no codes thrown. It would happen sporadically and would go away if I accelerated a bit.

Finally got a check engine light, but my code reader and one at Autozone couldn't connect on 3 separate occasions spanning 2 days, telling me there's a linking error. Finally linked up and said:

P1368
P0352
P0353
P0355
P0358 (Brand new coil, 3 weeks old)

Cleared the codes but the restricted performance occurred again multiple times with no codes thrown. It also seems to run just fine when running from 25MPH and up with max. acceleration when I floor the pedal.

What sayeth all you car MDs?

Nick

P.S. It rained pretty hard here. I really can't remember if the problems started before or after the rain

 

check battery make sure it is fully charged. While it can start the car, a weak battery in these cars can and will make it throw all kinds of errors as the many electrical components do need good juice to them or they act odd.
I owned a 97 and it started doing things like you are explaining here. If you look into all the codes and can determine they are not the issue, look at the main computer. 97 models are well known for having issues with them. Circuit boards melt, burn up a little. Do a search here on the issue.

 

Thanks for the info, brg!

I've checked the battery and it is good. I need to know how to work thru all these codes to determine where I should focus before sending out the computer. Any direction would be appreciated from anyone

Nick

 

Open the ECU and look for leaking capacitors. The symptoms you are experiencing are typical for a failing ECU. Or just send it out for testing.

 

I suspect a poor connection at one or both ignition modules and/or at the ECM.
Open connectors, spray carefully with electrical cleaner (not WD40), and reconnect. Cheap and easy before tearing things apart.

 

Thanks Oyster and RJ
Will do and will post back next week. Long golf weekend in NY...

Nick

 

With so many coils being coded It's easy to jump to the ECM but before that there's and ignition module that needs to be eliminated as problem.

There's a series of tests in section 303-07 of the XK8 service manual for the '99 XK8 and I suspect that it would be similar for a '97.

 

Here's a thread that's 18 days without a response as to what may or may not have worked in dealing with a series of ignition codes. Just wasted effort on the part of several members.

 

RD, I have shared that feeling many times. Probably a good thing you posted this as a reminder to folks how much we appreciate a follow up.


John

 

Sorry for the late follow up guys.
I removed the ECU and opened it up. Sure enough, one of the capacitors had brown staining around it.
I just FedExed it out to ASI today. I'll post an update as soon as it's back.
Sorry again

Nick

 

RD
There were no wasted efforts by anyone in this forum. I took all the info and went thru the process to try and identify the cause. It was through the advise of several members that led me to an potentially inexpensive fix.
Life is busy and this is not the only vehicle I own, so it was garaged. That was the delay in posting a follow up.
Again, I apologize

Nick

 

Thanks for the update Nick. I'm glad to see it is sorted out.

John

 

Please help me with the following issue on my 2003 XK8 convertible with 93000km

Symptoms:

- Rain detector doesn't work
- Steering column doesn't retract sometimes
- Day/night auto light doesn't work
- No MIL lamp or message

Those are not big things, but when I read out the BPM fault codes, there are many and I don't feel confortable with them.

Body Processor module fault codes from my reading device (Foxwell NT624 - nice tool!)

U1041 Vehicle speed not obtained
U2012 Communication bus error
B1595 Ignition switch - Illegal input code
B1897 Horn switch - circuit failure
B2368 Column adjust switch - out of range
B2351 Column adjust switch
B2331 Column drive reach out of range low
B2334 Column drive tilt out of range high
B2335 Column drive tilt out of range low
B1446 Wiper park sense - circuit failure
B1875 Turn signal switch left and right switch active
B1450 Wash/wipe switch circuit failure

I would like to narrow down to the root cause of those failures, I am suspecting the following possibilities:

- Bad earth or B+ connection somewhere
- Bad connection in the BPM connector
- Partially faulty BPM module
- Partially faulty ICM module

Where would you begin the troubleshooting?

(The battery looks fine)

 

It would seem that most of your problems are centered around the steering column and the turn signal switch. I can't speak specifically to Jags but in general a heck of a lot of electrical problems affecting everything from brake lights, turn signals, wipers, and even cruise control on occasion can be traced back to a bad turn signal switch and its mechanism. A hell of a lot of a cars circuits go through that single assembly.

As for the steering column tilt and telescope feature there are several threads dealing with the motor and circuits that handle those chores and often it's nothing but a matter of getting into the motor and gears and cleaning out the aged lubricant/grease that has stiffened with age and lack of use. Could be more serious of course but you can always hope for the best.

Will the steering column move if you repeatedly hold the switch manually? Does in move in small increments manually until it's where you want it or is it stone dead?

The rain sensor is a microphone hidden in the rearview mirror's stalk that is facing the window and is sensitive enough to 'hear' the rain hitting the windshield. The mike could be bad but given your other problems coming from the trunk signal area I'd bet the problem is there and not at the mirror.


If it was me I'd start with the suggested pinpoint tests dealing with the communication errors so you can rule out problems with the affected modules even though I'm betting it's the turn signal switch that's bad.

One other thought. Have you cleared any codes previously or are these the result of your first attempted scans? If they are your first attempt keep in mind that codes stay resident pretty much until cleared and some of them may no longer even be relevant and may have been essentially transient. You have a record of them now so I might clear them and take it for a several drive cycles like you normally would and do a rescan or three to see which ones return. That way you're not chasing ghosts of a no longer existing problem.

Just my 2 cents though.

 

Hey folks

So I sent out my ECU to ASI last Thursday and just got it back!

Firstly, the turnaround time is incredible!

Second, after checking out their website, the price for the rebuild was $349. On impulse, I checked out and found them on eBay offering the same service for $159!

My baby purrs like a kitten...

Nick

 

Were you able to get the ebay price?

Not a smart business decision by ASI for them to gouge their website customers just because they can....

 

Yep. Got the eBay price although I never contacted them before and told them I saw their website.

I don't think that the original $349 is really gouging. The car is dead in the water without the ECU. Rebuilt computers average $1400-1500 and God know what a new one runs so 349 is still a bargain. 159 is a steal! They've also rebuilt my ABS unit previously and did a great job.

Nick