Hi Everyone,
Today: Checked/charged battery, volts OK.
Removed/dried/cleaned spark plugs and checked for spark, all OK.
Removed cam sensor connector while running... stopped engine, OK.
Removed MAF air connection whilst running... stopped engine, OK.
Again introduced butane gas around possible suspects for air leak... no effect.
All the 8 plugs are wet with fuel when checked.

Is it possible the electronic throttle is faulty?... I'm fast running out of things to eliminate!!

 

Wet plugs indicate low/weak spark.

Try fresh spark plugs?
Also, unplug the o2 sensors and see if there is any difference in running.

Shouldn't the car run in default mode witth eh MAF unplugged though?

The brain is going add or delete fuel based on the reading from the MAF and O2 sensors, so... if it is overfueling those would be logical points to check- unless the plugs are wack.

Do you have a scan tool that will let you take real time readings? This will allow you to see things like throttle position and O@ readings/trim to see if they are giving bad readings.

 

Hi, many thanks for that.
The plugs are new but the old ones were working OK, so I could swap them back. I'll get on to checking the o2 sensors in the morning.
My scanner will record real time data though I'm inexperienced with it and I'm not sure what to be looking for however I'll come back here with what I can find re throttle etc!
Cheers!

 

It may be worthwhile to check the throttle position sensor since you would have been at least near it to do the previous work. You could start by reading the throttle position through a OBD scanner for sanity. For example, with the key at position 2, foot off accelerator, it should read a low percentage. Someone with more experience might be able to tell you what range of values to expect.

You might also want to check the actual throttle cable in case it is too tight.

There is also a static resistance test for the TPS potentiometers. The values and procedure may be in JTIS.

BTW, useless post and response to useless post deleted.

 

Hello again all!

Live data today on the scanner shows, at idle revs:
Bank 1, o2 sensor at 0.055v
Bank 2, o2 sensor at 0.210v
MAF 1.651
TP% 47.5

Is the difference between o2 readings significant please?
Thanks

 

Throttle position should be at 0-3%ish at idle...

Is the throttle cable too tight?

 

Hi, throttle cable is adjusted ok.. back to stop with a little play.
How to fix electric throttle setting please?

 

A hard reset.

 

Hi All,
Today: Hard re-setted, Still will not run, still throwing vast amounts of fuel into the engine and gueing up plugs.
Disconnected both o2 sensors, no different.
I have again checked cam timing ... still OK!
Checked spark... it's excellent, then swapped for a different set of spark plugs, no different, will not run beyond 10 seconds. Any movement on throttle stops the engine.
Had local mobile Diagnostic Tech. guy to help analyse my problem with his 'Snap On' scanning gear, he also can't find any faults.
What's my next step please???
This really is becoming an epic and unfortunately there is no Jaguar help locally, I'm relying on you guys to help me through this...!

 

Does your scanner still show the TP at 47% at idle? That would be the smoking gun- If your butterfly is at 1-2% and the brain THINKS it is a 47%, you would have waaaaay too much fuel being delivered.

 

I'll check first thing in the morning.
I notice that when ignition is switched on with no movement on the throttle pedal, there is a whirring noise from the throttle housing as if the motor's running permanently, is this normal?
Thanks again!

 

I just checked mine and it does whirr continually until I start the car.

Sounds like you have a problem in the throttle body- hopefully it will be an easy fix now that we found the culprit.

Try uplugging and replugging your throttle body connector.

Here are my readings for what it is worth, at idle:

STFT B1: -2.3 B2: -3.9
LTFT B1:1.5 B2: 6.2
RPP: 665
TPS: 1.5% <<I think this is where your problem lies.

 

look at post #24 again

 

OK, just checked TP % and it's 5.5% at idle and now working through the range OK... damn, thought we had it!
The other symptom was the erratic on/off of the cooling fans and I notice the rev counter stops and starts and dash lights flicker just before the engine cuts. I'll try connecting an earth wire from the head to the body and direct to the battery. Let you know what happens.

 

Describe working through the range OK.

 

The TP % at idle position shows 5.5% and will increase gradually with pedal movement through to 79%.
Fixing earth wires to the engine made no difference.
Mobile Tech. guy returned today with a more 'Jaguar specific' scanner programme, momentarily showed a crank sensor fault but that cleared and afterwards showed 'no faults'. Is it worth trying a new crank sensor now?

 

At LEAST take it out and clean it. What we are looking for is an indication of some kind of change in behavior to get us on a diagnosis track. The more detailed you are in the changes the better.

 

I've removed the sensor on a couple of occasions when fitting the locking tool for cam shaft setting, it looked perfectly OK then.
What on the flywheel does the sensor detect to give it a signal? could I have damaged something when I jammed the flywheel in order to loosen the crankshaft pulley bolt??
Thanks.

 

hmmm, might be onto something here, I was cautioned about doing the same thing, by loosening the crank pulley bolt and relying on the dummy sensor can damage the starter ring gear.
I don't know the symptoms - but timing out and overfuel, it's possible.

There's a Jaguar special tool that holds the pulley as you undo the nut...

The other pic is of the starter ring and the slot with curved top and bottom is the where the locking tool slots. This might be worth checking out...

 

Noooo... didn't use the locking tool to undo the crank bolt... the slot for the locking tool remains OK!
Does the crank sensor rely on the slots in the flywheel to generate a signal?