I get a Engine fault reading when my Car is hot and I let go of the Accelerator, Car runs fine. I heard this could be a difference between the two Throttle Body Sensors. Who are the Companys who adjust this?

 

Can you read the OBD codes and post them ?

 

I can't get a code to come up, even while on live data while driving. Sometimes it goes into "Poor Engine Preformance" and goes away when restarting the Engine. Any suggestions!

 

Are you getting a P1111 or P0000 code. Can you see the fuel trims ?
I'm prepared to be corrected but for the CEL to come on there has to be a code.
What message are you getting ? 'Restricted Performance' ?

 

+1, even a gearbox fault or restricted performance will be supplementary to a DTC code being generated. If you're scanner doesn't see one, try a free-scan at an auto parts store, may have better luck....don't turn off the car though

 

Actually, a P1111 (Emission Monitors Complete) or a P1000 (Emission Monitors Not Complete).

Of course, These are Status Codes, not Trouble Codes.

 

Paul,
I'm suggesting his OBD reader isn't reading.

 

True, There should ALWAYS be a P1000 or P1111 (and possibly other Codes) displayed if the Code Reader is communicating with the Car.

 

Some Code Readers just report 'SYSTEM PASS NO FAULTS FOUND' and will not see the P1111 or P1000.

bob gauff

 

Yes I'm getting a P1111 which is system pass code, not a fault code right? I'm new to working on newer Cars with Computer Systems. Here is what I'm being told so far. Please correct me if my info is wrong! To truly enter the Cars Computer (ECU) you need a program which is Jaguar specific (not all Shops have that). Using a Code reader is a backdoor way in, which might not give you all the info.If some one can enlighten me on that and give me a way to proced, that would be much appreciated. Thanks Guys!

 

Have you downloaded the JTIS from the sticky at the top of the section ?
It's a bit fiddly but an invaluable complete manual for your car.
In there you'll see a DTC (diagnostic trouble code) section.
There are four code classes
Bxxxx - Body
Pxxxx - Powertrain
Cxxxx - Chassis
Uxxxx - Network

Cheap readers can only read P codes, although there are readers that can read the others for £300 beginning to appear.
The P codes are engine and gearbox related and so very useful for sorting out problems like yours.

If the fault was B,C or U you wouldn't see the codes but (and I stand to be corrected) you would ALWAYS get some generic message displayed.
If your message is 'Restricted Performance' then there MUST be a P code.
There are a handful of P codes that require WDS (Jag tool) or an expensive gadget to retrieve but (again I stand to be corrected) None set the MIL + Restricted Performance
Only
P0610 TRANS TCM Configuration error Mechanical limp home mode
P1571 Brake switch malfunction
affect performance and (Jaguar says) are not OBDII readable
But they also say P1111 and P0000 are not readable either.

Back to your problem - I still think your reader isn't picking up the problem code although it's seeing the P1111.
Can you see things like fuel trims ?

Finally - what colour is the MIL light and what is the error message ?

 

This Yellow Code I get only after the Car drove for hours.It comes on when you let go of the Accelerator but not completely,like slowing down for other Cars. It does not hinder performance as far as I can tell and goes away as soon you change Accelerator position. But at a few instances I get a Red Code saying "Poor Engine Performance" and if I don't stop and turn the Car off, it will go in limp home mode I think (little power).

 

Do you get this message ?
ENGINE FAULT - POOR VEHICLE PERFORMANCE ?
This, and TB problems should throw P codes as I understand it.
Do you live near somewhere with a free OBD code reader ?
If so take it there when you get the fault.
Anyone else got any ideas?

 

I got a diverent code reader and I got a Pending code now. P 1227 Mechanical Guard Circuit Low Input. What does this mean? Thanks for your help.

 

The 97 uses a Potentiometer to indicate Mechanical Guard position. This is one of 3 Pots on the Throttle Body in the Pedal Position area. In addition, there are 2 sensors for Throttle Position.

A worn out Pot or a Poor Connection to the TB could cause this. First, try cleaning the TB connections with Electrical Contact Cleaner.

Unfortunately, The Pots are not available separately, you must buy the whole TB ($$$$$).

There are TB re-builders that may be able to refurbish your TB.

 

So my Throttle Body is on his merry way to ASI, all the contacts where sparkling clean. When I took of the Throttle Body I found a pool of Motor Oil on the bottom of the Intake.That seems to be the wrong place for Oil, is that a Valve issue. If been complaining about excess Oil consumption. Fixed all other problems got it from 1qt per 1k to 1qt per 2k. Also when I took the lower Coolant Hose of the Throttle Body there was no Coolant flowing out. Is that normal or do I have an issue there. Happy Holidays to all of you, have a great Day!