Given up!!

simondhopkins · 18th June 2022, 11:49

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.

JefferiesFarnol · 18th June 2022, 12:38

Quote:

Originally Posted by simondhopkins

Might have to go back to a mondeo.

That's the saddest thing I've ever heard

Bogbrush82 · 18th June 2022, 13:45

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

vitesse · 18th June 2022, 13:58

Quote:

Originally Posted by Bogbrush82

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

Arctic · 18th June 2022, 14:36

Quote:

Originally Posted by simondhopkins

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.

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

raykay · 18th June 2022, 21:41

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

Ched · 18th June 2022, 23:29

Sensor on the end of the hp pump

genpk · 18th June 2022, 23:38

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.

Arctic · 19th June 2022, 00:03

[QUOTE]

Quote:

Originally Posted by Ched

Sensor on the end of the hp pump[/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.

1

2

3

4

Ched · 19th June 2022, 20:12

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.

18th June 2022, 11:49	#1
simondhopkins Loves to post Rover 75 Join Date: Jul 2016 Location: Burnley Posts: 437 Thanks: 175 Thanked 83 Times in 60 Posts	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. __________________ Mk1 Club SE DEAD MK2 Contempary SE been sorn by someone Mk1 Connie SE. Current car This vehicle was the 76,630th 75 to run off the production line, out of 112,381 This vehicle was the 514th 75 CDT Connoisseur SE (135) to be made out of 4,744 This vehicle was the 8,994th 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s

18th June 2022, 13:45	#3
Bogbrush82 I really should get out more....... Rover 75 2.0 CDTi Join Date: May 2017 Location: Tipton Posts: 2,185 Thanks: 49 Thanked 733 Times in 405 Posts	Does the 75 have a limp mode? Could be the 02 sensor? __________________ Current car: 2005 Honda CR-V in Cosmic Grey, and against my better judgment has become a resto project.

18th June 2022, 21:41	#6
raykay I really should get out more....... Now Other Manufacturer Join Date: Nov 2006 Location: Co. Kerry Posts: 2,768 Thanks: 16 Thanked 310 Times in 283 Posts	I have had a similar problem - it was a faulty fuel rail pressure sensor. Last edited by raykay; 18th June 2022 at 21:44..

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18th June 2022, 23:29	#7
Ched I really should get out more....... MG ZT V8, MGZT 135 derv ,MG TF 135 Join Date: Dec 2011 Location: Romsey Posts: 2,143 Thanks: 530 Thanked 562 Times in 375 Posts	Sensor on the end of the hp pump

18th June 2022, 23:38	#8
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,651 Thanks: 3 Thanked 453 Times in 296 Posts	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.

19th June 2022, 20:12	#10
Ched I really should get out more....... MG ZT V8, MGZT 135 derv ,MG TF 135 Join Date: Dec 2011 Location: Romsey Posts: 2,143 Thanks: 530 Thanked 562 Times in 375 Posts	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.