Hi,

I have a 2002, 2.1 petrol, manual X type. I think it is a later 2002 model, since when I type reg into car parts sites it says 2003.

When cold it works fine, pulls up hills like they are not there, will rev past 4000, and is a joy to drive. Also when the temp gauge gets to normal it is fine.

A little while later it really struggles to get up a hill. the more you put your foot down the slower it wants to go. It is also slightly noticeable on flatter ground, if I throttle hard, there is hesitation, but it does get there.

I have seen a few error codes, but the only one that stays on all the time is 0701, bank 1 lean. I did see the 0704 code for bank 2 also lean, but only briefly.

I have checked all of the hoses I can find for leaks, and used the carb cleaner method around the manifold, air flow valves, and pipes, no joy there.

I think the next step is either injector(s) blocked, or upstream o2 sensor.

Would either of these only malfunction when hot, or is there something else I should be looking at?

Thank you in anticipation,
Bob.

 

Welcome to the forum Bob,

I've moved your question from General Tech Help to X-Type forum. Members here with the same model will be able to help.

Graham

 

Codes are always the best way of getting to the root of the issue quickly as you know, those codes should help


By any chance are you also getting really poor mpg?


On a 2002 / 03 with presumably higher mileage its likely to be 02 lambda sensor related BUT always worth checking codes given further first


Good luck

 

Thanks for your reply Jim,

Yes My MPG is poor, I think. For the first 2 days I owned it, to work, & back gave almost 25, now after trouble started only 20.

A weird thing happened though. For 3 days last week I only saw 0701 code, with a couple of pending codes which went away. I cleared the fault, using scanner 2 days ago, and now I only see 0704. So the fault seems to have swapped banks, go figure. The other codes were either the test cycle complete or not, as I have found since, and the codes saying manifold air valves not working, but these were only there as pending for a very short time.

One thing I did today was put cable ties on the breather hose, from the inlet manifold, to crank case, as I saw a photo on net where these had clamps on them, this seemed a little lose to me. The hill that was giving me so much trouble was no problem today, but I did park up for 5 minutes before trying to go up it. Mainly to let people get past me before I crawled up it.

I will see how it goes tomorrow, without a break.

Forgot to mention. The engine light is still on with only 0704, and even though the car flew up the hill, I still had the yellow warning light, and message saying cruise control not available, flash up a couple of times then go away. As I said I will see how it goes tomorrow.

Have owned it for a week, and had 4 or 5 days of it giving me trouble, still love it though.

Regards
Bob.

 

Quick update. The cable ties on breather hose made no difference, and still only getting code 0704, bank 2 lean. Next stop upstream O2 sensor, I think.

Bob.

 

Thank you for your interest in solving my problem.

After work today there is an update.

As soon as I pulled out of the car park the check engine light went off, or blew the bulb, or led. I thought the injector cleaner had done its job, but sure enough problem still there. Feels more like a 3 tonne Gee whis than a Jag.
When I'd limped home plugged in the scanner, and now have codes for both banks lean.

I have no codes that are to do with o2 sensors.

I think it now makes perfect sense.

I bought the car a week ago, with no fuel in it, so filled up asap, worked fine for 1 1/2 days, then the trouble started.
Had code for bank 1 lean, then bank 2, then back to bank 1. I now have both codes, but no check engine light.
When on flat ground, or in neutral no problem, but the hills it just does not want to go there.

I think it must be the fuel filter. When I really do need some fuel it just won't do the job, but when not so much fuel is needed works fine.
Filling it up must have washed all sorts of muck into the filter, which is why it only struggles up hills.

I will change fuel filter tomorrow, if the boss will give me time off to go pick one up.
Hope this is the cause, if not I can see this costing a small fortune. Will keep everyone posted.

Regards
Bob.

 

New fuel filter made no difference.
When I went to pick it up I had to drive through heavy traffic for over an hour. On the way home it was even worse than ever, would hardly move on the flat also. Managed to get it home driving a few hundred yards at a time. It seems the hotter the engine gets the worse the problem.
Drove the 15 miles to work this morning, feels like a new one.

Bob.

 

Check engine light has gone off, and no error codes are stored BTW.

 

Google says:

Throttle sensor?

http://www.jagrepair.com/images/TSB/...g%20Issues.pdf

http://www.justanswer.co.uk/jaguar/7...ght-stays.html

 

Thanks Santer, but not getting any of the fault codes mentioned in those PDFs.
Now I have 0701 again, bank 1 lean.
I think I will replace upper, and lower manifold gaskets, since I bought them already, and it is not too difficult a job. At least it will eliminate one of the more common faults if nothing else. I could not find a leak spraying carb cleaner around the joints, but It will only take a couple of hours, and cost nothing that I have not already spent.

If not that then there is an independent Jaguar specialist fairly close to work, so looks like it will have to go there.

Bob.

 

Worst case scenario you are reasonably close to one of the best Jaguar Indy's in the country, in Doncaster, only around 50 miles away.

Chris Isles, The Jag Specialist
01302 832600

He's a great guy, I've travelled from Glasgow to get quality work done at great prices too, well worth checking out if you get to that stage

Good luck

 

You may want to check for a clogged catalytic converter or blocked exhaust.

 

This is for an S-Type, but may be of some help and direction since the codes should be the same.

Transmission Control Module
If the diagnostic software tries to enter two contradictory failure mode strategies or if there are contradictory output states commanded versus the expected output states, a P0701 fault is stored.

Does your scanner scan all codes like transmission codes as well, or just P codes? Could be a damaged TCM. Maybe water ingress. I'd kind of think that would be an all time issue though, not just when the car got warmer. So it may be a wiring or connection issue. Did anyone work on the transmission, clutch or reflash the TCM and FUBAR the work?

A P07XX code for Jag is generally Transmission related.

P0700 Transmission Control System (MIL Request)
P0701 Transmission Control System Range/Performance
P0702 Transmission Control System Electrical
P0703 Torque Converter/Brake Switch B Circuit
P0704 Clutch Switch In put Circuit Malfunction
P0705 Transmission Range Sensor Circuit Malfunction (PRNDL Input)
P0706 Transmission Range Sensor Circuit Range/Performance
P0707 Transmission Range Sensor Circuit Low Input
P0708 Transmission Range Sensor Circuit High Input
P0709 Transmission Range Sensor Circuit intermittent
P0710 Transmission Fluid Temperature Sensor Circuit
P0711 Transmission Fluid Temperature Sensor Circuit Range/Performance
P0712 Transmission Fluid Temperature Sensor Circuit Low Input
P0713 Transmission Fluid Temperature Sensor Circuit High Input
P0714 Transmission Fluid Temperature Sensor Circuit Intermittent
P0715 Input/Turbine Speed Sensor Circuit
P0716 Input/Turbine Speed Sensor Circuit Range/Performance
P0717 Input/Turbine Speed Sensor Circuit No Signal
P0718 Input/Turbine Speed Sensor Circuit Intermittent
P0719 Torque Converter/Brake Switch B Circuit Low
P0720 Output Speed Sensor Circuit
P0721 Output Speed Sensor Circuit Range/Performance
P0722 Output Speed Sensor Circuit No Signal
P0723 Output Speed Sensor Circuit Intermittent
P0724 Torque Converter/Brake Switch B Circuit High
P0725 Engine Speed Input Circuit
P0726 Engine Speed Input Circuit Range/Performance
P0727 Engine Speed Input Circuit No Signal
P0728 Engine Speed Input Circuit Intermittent
P0730 Incorrect Gear Ratio
P0731 Gear 1 Incorrect Ratio
P0732 Gear 2 Incorrect Ratio
P0733 Gear 3 Incorrect Ratio
P0734 Gear 4 Incorrect Ratio
P0735 Gear 5 Incorrect Ratio
P0736 Reverse Incorrect Ratio
P0737 TCM Engine Speed Output Circuit
P0739 TCM Engine Speed Output Circuit Low
P0739 TCM Engine Speed Output Circuit High
P0740 Torque Converter Clutch Circuit
P0741 Torque Converter Clutch Circuit Performance or Stuck Off
P0742 Torque Converter Clutch Circuit Stuck On
P0743 Torque Converter Clutch Circuit Electrical
P0744 Torque Converter Clutch Circuit Intermittent
P0745 Pressure Control Solenoid "A"
P0746 Pressure Control Solenoid "A" Performance or Stuck Off
P0747 Pressure Control Solenoid "A" Stuck On
P0748 Pressure Control Solenoid "A" Electrical
P0749 Pressure Control Solenoid "A" Intermittent
P0750 Shift Solenoid "A"
P0751 Shift Solenoid "A" Performance or Stuck Off
P0752 Shift Solenoid "A" Stuck On
P0753 Shift Solenoid "A" Electrical
P0754 Shift Solenoid "A" Intermittent
P0765 Shift Solenoid "B"
P0756 Shift Solenoid "B" Performance or Stuck Off
P0757 Shift Solenoid "B" Stuck On
P0758 Shift Solenoid "B" Electrical
P0759 Shift Solenoid "B" Intermittent
P0760 Shift Solenoid "C"
P0761 Shift Solenoid "C" Performance or Stuck Off
P0762 Shift Solenoid "C" Stuck On
P0763 Shift Solenoid "C" Electrical
P0764 Shift Solenoid "C" Intermittent
P0765 Shift Solenoid "C"
P0766 Shift Solenoid "D" Performance or Stuck Off
P0767 Shift Solenoid "D" Stuck On
P0768 Shift Solenoid "D" Electrical
P0769 Shift Solenoid "D" Intermittent
P0770 Shift Solenoid "E"
P0771 Shift Solenoid "E" Performance or Stuck Off
P0772 Shift Solenoid "E" Stuck On
P0773 Shift Solenoid "E" Electrical
P0774 Shift Solenoid "E" Intermittent
P0775 Pressure Control Solenoid "B"
P0776 Pressure Control Solenoid "B" Performance or Stuck Off
P0777 Pressure Control Solenoid "B" Stuck On
P0778 Pressure Control Solenoid "B" Electrical
P0779 Pressure Control Solenoid "B" Intermittent
P0780 Shift
P0781 1-2 Shift
P0782 2-3 Shift
P0783 3-4 Shift
P0784 4-5 Shift
P0785 Shift/Timing Solenoid
P0786 Shift/Timing Solenoid Range/Performance
P0787 Shift/Timing Solenoid Low
P0788 Shift/Timing Solenoid High
P0789 Shift/Timing Solenoid Intermittent
P0790 Normal/Performance Switch Circuit
P0791 Intermediate Shaft Speed Sensor Circuit
P0792 Intermediate Shaft Speed Sensor Circuit Range/Performance
P0793 Intermediate Shaft Speed Sensor Circuit No Signal
P0794 Intermediate Shaft Speed Sensor Circuit Intermittent
P0795 Pressure Control Solenoid "C"
P0796 Pressure Control Solenoid "C" Performance or Stuck off
P0797 Pressure Control Solenoid "C" Stuck On
P0798 Pressure Control Solenoid "C" Electrical
P0799 Pressure Control Solenoid "C" Intermittent

 

Yay a solution, It turned out to be the mass airflow sensor.
It must have had a dry solder joint or similar, where heat caused it to fail somehow.
Thats why the car would run fine for a bout 35 to 40 minutes. As the engine block got hot it would finally radiate enough heat to screw up the sensor.

Hope this helps others in future.

On to the new problem now. Coming home from work the engine would not idle below 2000.
Never a dull moment when you own a Forduar.

Bob.

 

Bob.
I see a trip to Halfords and some throttle body cleaner in your future

sounds like your butterfly valve may need a cleaning.