2002 XKR with 130,000 miles:

after about a 4 hour fabulous drive, coming down a long decent the engine died.

Followed by a rapid beep beep beep. No warning messages on the dash. Still had full brakes and steering.

Engine coolant temperature was normal @ 197 F & oil temperature was the 215 F (highway normal oil temp seems to be 210 - 219). fuel tank was about half full

Pulling over to the shoulder I shifted into neutral and the car instantly restarted. It would not engage drive gear until I'd slowed to under 10 mph. Once drive was engaged, the car accelerated smoothly and normally to my usual highway speed of 80 mph. Drove the final 20 miles into town without incident as if nothing had happened.

checked with code reader for stored codes, none found. Fuel trim readings were in the normal range. No loose plugs under the hood.

any ideas ? I did a forum search but came up blank

thanks,

Z.

PS Battery is new-ish ( 10 months old) and charging system seems to be fine, always showing 13-7 to 14.2v. Battery Tender + in use when car sits overnight or longer.

 

Install your OBDII reader and drive the car it should capture any temporary code that comes in.

Gus
www.jagrepair.com

 

+1 on connecting OBD reader.

What is fuel pressure at idle and WOT?

 

will do ! My new " X60 ",
( https://www.jaguarforums.com/forum/x...-gauge-210411/ )

....which doe read codes, was plugged in at the time, but recorded nothing. Tried checking with the icarsoft LR-1 when I got home. but no hits. Tomorrow I'll give it another try on the go.

no idea. will report back on that...

thanks for the suggestions.

Z

 

this sounds a lot like an intermittent failure of the ignition switch or its anti-theft module. when these switches get worn and erratic they can be set off by other items dangling from the key or by being bumped by the driver's knee. the way to check it is to open the lower column cover and with the vehicle running apply some rotational pressure to the switch. in some cars this shows the problem. if it is the anti-theft signal ring, it might be as simple as a poor connection.

 

XJRguy posted a document to help with stalling_while_driving.
A Throttle Data Download can help confirm a faulty throttle.

Jaguar Tech Hotline had us do this and send the readout when a faulty throttle was suspected.

bob

 

Cor reminded me. While reading your description reminded me (flashback) of hitting my key in ignition with my knee, causing a stall. Trying to start her in neutral while rolling caused error message (s?) To display. Restart from stop = all ok.

I hope yours is that simple.

John

 

 

 

yes, when that ridge of carbon forms just where the throttle blade meets the throat the engine starves for air while coasting and just shuts down the fuel which it will do anyway under no throttle input. the problem is that once coasting slowly enough or stopped where the engine is not being spun by the transmission, it cannot turn on the fuel due to not enough air reading at the 02 sensor.

 

 

different MAF sensor for the XKR, could try cleaning it first, however it did not cause your problem. a bad O2 sensor would not shutdown an engine.

 

 

This page has a fairly generic pic of V-engined "modern" (since about 1985) cars with OBD II:
OnBoardDiagnostics.com - Engine Basics

It may help to realise the PCM (powertrain control module) goes around a loop reading the sensors and tweaking the actuators many times a second. It can even see the little exhaust puffs as each cylinder fires and knows which puff is which cylinder, so can do all manner of adjustments and error detection.

 

right, the heated wires should not be touched, but definitely rinse them well with the cleaning spray. please note that the sensor wires are up in the top of the unit. some people see the little temperature ball lower down on the shaft and think that is the main part. also use the same cleaner for the exterior connections to the sensor.