The engine stalls immedeately when I put the car into gear. I had some idling problems, but this became better after rinsing the air mass unit. I get the P1041 code on my Icarsoft diagnostic unit.

Where should I begin trouble shooting?

 

Hello Kyrre,

Welcome to the Jaguar Forums! It's great to have you with us.

Please tell us the year, model and engine of your Jaguar so we can provide the most accurate replies.

Also, please visit the New Member Area - Intro a MUST so we can learn something about you and your Jaguar and give you a proper welcome.

Cheers,

Don

 

What fault does your iCarsoft ascribe P1041 to?

Richard

 

It says «SCP vehicle speed signal - invalid or missing message»

 

You really do need to tell us what the car is, otherwise we're shooting in the dark...

 

I don't think P1041 is a valid jag code. Could it be P0141?

 

^^ Would make more sense: HO2S A bank downstream heater, AJ27

I can't find a Jaguar ref. to P1041

 

Is it actually U1041?

Richard

 

Thanks for helping me. The car is a 1997 Xk8, and the Icarsoft gives me U1041 /«SCP vehicle speed signal - invalid or missing message»

 

Hi Kyrre,

I can't find U1041 as a valid code for the X100 until the 2003 model year. Here's the definition and possible causes from the DTC Summaries:



I am not familiar with the available equipment on the 1997 XK8 for the Sweden market. Is your car equipped with CATS Adaptive Damping Suspension? If so, then the above definition may or may not apply to your car. It is also possible that your scan tool does not understand data it is reading and is "guessing" that U1041 is the correct diagnostic trouble code.

Either way, it seems unlikely that a problem with the vehicle speed signal would cause the engine to stall when you put the transmission in gear. The rough idle is a clue. When was the last time you gave it a good tune-up besides cleaning the MAFS? Is it possible that you got some fuel contaminated by water?

Cheers,

Don

 

I have the same U1041 code every time I connect my iCarsoft, I think it's a false error, everything works fine. Just ignore it, your problem is elsewhere.

 

^^
Agree with above. This DTC seems to crop up frequently. Ignore it for now.

Can you give us a little background? Is the car new to you? Is this a new problem and/or has any work been done recently?

MY97:- has the ECM been repaired?

 

Thanks for your answers, it might be helpful.
I had the transmission box out for a major overhaul two years ago. When everything was back in place I drove the car for a couple of miles and it worked out fine as expected. But then it suddenly stalled, and has been difficult since. A local workshop told me to change the throttle box, which I did (got a used one from England), but it still is not good.
I shall ask a friend of mine (a professional mechanic) to bring his professional diagnostic tool to see if he gets other codes. I will be back here on the thread…

 

By 'throttle box' do you mean the whole throttle body assembly?:



I'd expect more relevant code(s) - does the engine run smoothly if you rev it gently in neutral?

 

Yes, I replaced the whole throttle assembly.
And I can shift the gear into N, but not in R or D without stalling.

 

Hi Kyrre,

It seems that you are unfolding the story a little at a time. We may be better able to help if you can tell us all the service and repairs done to the car leading up to the transmission overhaul. You didn't tell us about the transmission overhaul until Post #13 or the throttle body replacement until Post #15. Please tell us the entire story so we have the same knowledge of the history that you do.

Cheers,

Don

 

Good point, let me try to recap my Jaguar history:
I bought the car, a 1997 XK8 convertible, 4 years ago from an owner here in Norway. I knew there were an issue with the transmission, that made it occasionally go to LIMP mode and show the code «transmission fault» (I think). I took the gearbox out and had it overhauled by a professional workshop. I put it back in the car, and everything seemed to work fine for a while. Then after some miles the engine stalled, with the message «engine stalled» in the display. Now it has not been used for almost 2 years, and needs desperately to be fixed before next summer!
On my Icarsoft I get the U1041 code (as described over - which I now understand might be a faulse code). I was told by my workshop to change the trottle body, which I did (used item from England), I also cleaned the mass air flow threads and put in a new air filter.
The engine starts fine, and runs ok at around 800 rpm, but stops imedeately when the gear shift is set in R or D.
That is pretty much what I have experienced so far, and I will be very happy to solve the problem.
Yours,
Kyrre

 

Hi Kyrre,

Thank you for those additional details and history. Here are some random thoughts:

1. Problems with the torque converter in the transmission can cause engine stalling. I am not familiar enough with the torque converter in the ZF 5HP24 to know if it is subject to these kinds of problems, but perhaps one of our other members will know. The fact that these symnptoms began not long after the transmission overhaul could suggest a torque converter problem.

2. How recently had you purchased fuel when the engine stalled two years ago? Is it possible that the fuel was contaminated with water? Did you scan the car for diagnostic trouble codes at that time? Were there codes for misfires in any cylinders?

3. After two years, the fuel in the tank is contaminated and deteriorated. Condensation forms in the fuel tank over time and drips down from the ceiling of the tank into the fuel. The denser water settles to the bottom of the tank, where it is inhaled by the fuel pump. I would expect this condition to trigger misfire codes, but it could explain the low engine power and stalling as soon as load is applied by shifting the transmission into gear.

4. It would be worth draining the fuel tank and installing a new fuel filter to rule out bad fuel and a clogged filter.

5. Sometimes symptoms like these are due to multiple components not performing up to specification. For example, have you ever replaced the spark plugs with the correct NGK plugs properly gapped?

6. If your scan tool can read the fuel trims, please post the Short Term and Long Term Fuel Trims (STFT and LTFT).

7. If the timing chain tensioners had broken we would expect more serious symptoms and we wouldn't expect a smooth idle. However, it is important to know that your engine originally came equipped with plastic-body upper/secondary timing chain tensioners, and these plastic tensioners are known to crack and break. Metal-body tensioners are available and should be installed if your tensioners are still plastic.

I'll keep trying to think of ideas, but hopefully other members will have better ideas.

Cheers,

Don

 

Thanks a lot for this comprehensive answer. Maybe I should start with draining and renewing the fuel, and see if that helps.
Thanks for qualified advice so far!
Yours,
Kyrre

 

XK8 1997: What is the best way to drain the fuel tank, and to be sure I get all of it out? Is it through the fuel inlet at the fuel filter, or is there a draining plug on the tank…?