Given up!!
 

Having replaced both ubp and itp, I have constantly had the throttle cut to no more than 2000 revs.

Nothing is showing on toaf, leakback test is all good. No signs of fuel leaking from the HP pump, no smell of diesel in the oil.

Oil pressure light comes on, ecu is clean and I have also stripped the ECU to check for corrosion and its clean.

At my wits end with the damn thing now. It don't matter how much fuel is in the car either.

Box had a fluid change, no difference, 2/4 solenoid no difference.

Think its time the scrap man came and took the blasted thing away. :(

Might have to go back to a mondeo. Never had a problem with the mk1/2 or 3 I had except they weren't as nice to drive as a 75.

That's the saddest thing I've ever heard :(

Does the 75 have a limp mode? Could be the 02 sensor?

The autobox certainly has but then you generally get the error EP. Even though the EMU appears 100% dry they do fail.

I'd suggest trying to nurse the car to someone knowledgeable with a T4, I don't know how far the OP is from BigRuss. My daughter had a strange fault on her V6 which we thought was relay related. Nothing on Toaf but my T4 identified a cam sensor error, swopped and all good. Strange but happy result.

Regards

Hi Simon.
Try unplugging the MAF sensor see if it changes anything, also do you have an FBH on your car?

I have had a similar problem - it was a faulty fuel rail pressure sensor.

Sensor on the end of the hp pump

had similar thing happen to me on a kv6 2.5 engine.
Turned out to be a faulty o2 sensor, the first one before the cat converter.
Easy to check, just unplug it and the ecu goes to a default setting and runs fine.
The plug is right next to the aircon pipes going down the fire wall,
At least its easy to eliminate if it not that.

[QUOTE]]

Hi David.
You are referring to the regulator, yes sometimes the O-rings can fail, but you usually get a none starting problem with that.
https://i.imgur.com/1tkRUy6l.jpg1

https://i.imgur.com/jzQXD1hl.jpg2

https://i.imgur.com/hNMBxx6l.jpg3

https://i.imgur.com/E0N5cMkl.jpg4

First zt tourer I had had a fuelling prob, previous owner had replaced everything except that sensor, it was over pressurising the system and the car cut out but restarted straight away, a t4 session identified the culprit and a good used replacement cured it.
The other thing could be the throttle pedal is worn out, best thing is the Op get it on a t4.

Well I guess I can go and get one, but if that don't fix it then I can't throw any more parts at it.

Thanks for the feedback everyone.

Does anyone have a part number for it as not getting any results on ecp/dmgrs/rimmerbros please.

I had issues with this valve a few years back.
Trikey, came over with his T4 and diagnosed the problem.

Just checked back in my txts and he sent me this ebay item no.
https://www.ebay.co.uk/itm/261592591923


Any help?

If that doesn't fix it then check the engine wiring loom - voltage supplies to the sensors and signals back to the ECM.

You could always go for the seal kit at £5.22 link below, lots of times its the seals that are leaking.

https://www.ebay.co.uk/itm/333148956495

hold up, thats a different part there. Thats for the HP pump, I'm on about the sensor on the rail.

If the one on the HP pump goes, usually its a non starter from what I'm aware.

I've got a rail sensor coming now thanks.

Voltages are ok, earthing is good with very low ohms.

The car is not cutting out as in stalling and having to restart.

When under load, intermittently it will drop revs to 2k or below, then when I take foot off throttle it will either only go to 2k or will go back to normal.

I've ordered a replacement fuel rail pressure sensor ( the one under the inlet on the rail to the injectors itself) so shall see if that cures it.

If not, its being scrapped and will walk away. Ain't got the money anymore to throw at it.

I would consider getting her over to Big Russ in Liversedge (25-30 miles from you) - he is a font of knowledge on these cars:shrug: Worth a try.

Hi Steve.
Yes that is what i was referring to the post by Ched post 7 as i thought you were going to purchase a regulator for the HPFP therefore poste dup the kit just in case, did you try my suggestion in post 5 about the MAF sensor.

I also agree get car over to Big Russ.

Well...
 

The sensor came today so was going to fit it.... only for EP to show up on the gearbox when I went to go home from work. :eek:

Well the sensor is wrong!!!

STC4769A part code, but the body is a different size, as is the part that actually screws into the fuel rail. :mad::mad:

It don't meet the end in the rail, so allows high pressure fuel to be forced by and out the side of the rail.