Hi guys
My car started to surge as I was driving and when I went into a parking lot it continually stalls as I slow down. Starts right up but as I get going it surges and stalls. Has anyone come across anything like this?
I searched for this and some people think it is the crank position sensor!

 

needs real diag. could be crank sensor could be dead track in the tps could even be a bad iac stepper. pull the iac connector after the car is warmed up, drive around and tell me what happens

the trans light comes on any time the car stalls

 

Thanks @xalty
I'll try that tomorrow and let you know.
The surging that happens is while normal driving and feels as if the ignition is shut off momentarily

 

I had similar issues with a failed coolant temperature sensor.sensor causing stalls, idle and rev stability issues. Mine stalled and showed the transmission light a few times before it was replaced. If that's the problem then it would be an easy fix.
It would be worth getting some OBD2 readings to see if the ecu is reading a rational engine coolant temperature.
Also Worth checking and cleaning the idle control valve on the throttle body as it can get clogged with carbon or just fail, potentially causing similar problems.

 

Not sure a standard OBD2 reader would pull the transmission code on this car. It would reveal the problem for sure.

It has been reported that the iCarsoft i930 readers, for Jaguar, can pull jag specific including ABS and Transmission.

 

there won’t be anything of note

it’s just a rudimentary version of “engine stalled” that all the later cars have

 

On the transmission body connector that corrupts the speed sensor signal inside the transmission ( yep )

you don't have to jack the car

this connector does not simply twist off but is different

connector is on the left rear

to remove connector IT FIRST MUST BE PULLED STRAIGHT BACK ABOUR 1/8 INCH to unlock it then turn off

Because of the environment it could be stuck so soak with some penetrate spray before removing

the tywraps in the pic are the only way to grip the connector

 

Hi Omid,

Another known cause of stalling when slowing to make a turn or coming to a stop is low transmission fluid.

Often, these problems are the result of multiple systems operating out of spec. How long since it had a full tune-up?

Cheers,

Don

 

Hi guys
I got a scanner and this is what I got.
I reset the codes and they come back almost as soon as I start to drive. The car jerks and tugs as if the ignition is being turned off and on.

BTW thanks for all the tips.@Parker 7 on the transmission body connector am I looking for bad connection, corrosion? Or does it need to be secured with tie-wraps !

 

Sometimes oil will migrate into the connector from above so it would be a simple solvent clean

Corrosion would be to remove and reconnect several times dry to abrade the corrosion then and only after spray with protection

your codes are in the following link on page 111

you can use the 96 -97 codes as they are the same as they refined this 1ST generation ECU

www.jagrepair.com/images/Training Guides/801S - 2000.pdf

 

I could not find p0727 in that document.
I did find p1775 and it says "Possible transmission fault – check for flagged TCM DTCs"

 

sOMETIMES YOU HAVE TO SEARCH THE NET FOR A COMMON USAGE FOR A P0727

My keys are messEd up

 

See tsb 08.1 - 01 AND ON

JagRepair.com - Jaguar Repair Information Resource

 

See page 35 and 64

your p0727 IS ON PAGE 64

200 TITLE (jagrepair.com)

The E9 HAS TO DO WITH THE BMW model range as they are the same transmission ( bmw 700 SERIES )

 

Transmission output speed sensor is on page 63 so your P0727 would be engine crankshaft sensor

tHE MASTER cel FOR THE ckps P0335 DOES NOT ALWAYS SHOW in this early ECU

sEE ALSO cel TABLE page 72

So this points away from the transmission connector on the transmission body

 

@Parker 7 thanks for all the info.
Checked the transmission connector. it looked clean and secure.
Removed the crank speed/position sensor. I measures 1.36 KOhms across the terminals. I dont know what the specs are or if that is a valid test.
Ordered a sensor and will try it out.

 

sOMEONE FOUND THE TRANSMISSION ribbon connector on the transmission ECU not fully connected

it is under the glove box as a elongated Bosch or TRW unit

This is a pic of a right hand drive with the engine ECU always on the right side wall for both LHD and RHDl

The transmission ECU is above the pedals in this right hand drive pic but yours is a left hand drive and is not on the steering column side in both LHD and RHD

 

p0727 = engine stalled

mirrored in tcm, when car restarts it’s in limp home mode

 

You need someone to pull the transmission code. It’s a Jaguar specific code, so your generic code reader can’t pull it.

iCarsoft makes a Jaguar-Land Rover specific code reader. That would be able to pull the transmission code….as well as ABS codes, when that eventually happens.

 

Umless you are a code reader capable of pulling the transmission code.