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Old 18th June 2022, 11:49   #1
simondhopkins
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Default 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.
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Old 18th June 2022, 12:38   #2
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Originally Posted by simondhopkins View Post
Might have to go back to a mondeo.

That's the saddest thing I've ever heard
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Old 18th June 2022, 13:45   #3
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Does the 75 have a limp mode? Could be the 02 sensor?
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Old 18th June 2022, 13:58   #4
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Quote:
Originally Posted by Bogbrush82 View Post
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.

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Old 18th June 2022, 14:36   #5
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Quote:
Quote:
Originally Posted by simondhopkins View Post
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?
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Old 18th June 2022, 21:41   #6
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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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Old 18th June 2022, 23:29   #7
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Sensor on the end of the hp pump
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Old 18th June 2022, 23:38   #8
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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.
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Old 19th June 2022, 00:03   #9
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[QUOTE]
Quote:
Originally Posted by Ched View Post
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
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Old 19th June 2022, 20:12   #10
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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.
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