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Topic: 2.5 Diesel no turbo boost P1225 fault code? (Read 5268 times) |
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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2.5 Diesel no turbo boost P1225 fault code?
« on: Nov 9th, 2010, 9:55am » |
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Folks
I have commented elsewhere about my new 2.5 and it seeming a bit sluggish, it looks like the turbo is not kicking in at all. It will gradually get up to 70-80 but you can write a book in the time that it takes.
Any thoughts or ideas about checks and options?
Geoff
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Highlander
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Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
Posts: 8244
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Re: 2.5 Diesel no turbo help at all
« Reply #1 on: Nov 9th, 2010, 10:22am » |
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Does it rev up ok Geoff?
no air leaks or smoke?
I'm right out of turbos too! 
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo help at all
« Reply #2 on: Nov 9th, 2010, 12:14pm » |
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Stuart
It revs fine, but as I have said elsewhere its fine up to 2500 then takes an age to build up speed when under load. I was at Houghton le Spring yesterday and pulling on to the A19 up a gradual incline could not get above 50 for about 2 miles, not popular in the rush hour! Cruised back at 70ish when I got the revs up to 3000 but really tricky before then D & 3 seem to be identical, but perhaps thats another problem to look at.
No obvious air leaks to hear, bit of white smoke on startup this last couple of cold days.
Geoff
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: 2.5 Diesel no turbo help at all
« Reply #3 on: Nov 9th, 2010, 12:58pm » |
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Have you had a look here?
http://www.fordscorpio.co.uk/replacemap.htm
I have a spare MAP if you want to try it?
Oh its an auto??
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo help at all
« Reply #4 on: Nov 9th, 2010, 8:55pm » |
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Stuart,
Looking at the description, that looks to be a spot on description of what I am experiencing. Yep its an Ultima auto only thing its missing is a heated front screen and trip computer and perhaps reversing sensors.
I really want to persevere with it. Had new disks and pads today and had the tracking done and it handles beautifully but can scarcely pull the skin of a rice pudding.
Would like to try the MAP to see if that may be the thing, will check connections to it in the morning to see if it may be loose.
Geoff
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo help at all
« Reply #5 on: Nov 10th, 2010, 9:57pm » |
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Stuart you have a PM
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: 2.5 Diesel no turbo help at all
« Reply #6 on: Nov 10th, 2010, 11:31pm » |
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Geoff.
Has your diesel box got the old vacuum unit on the offside connected via a pipe running across the top of the box ?,if the pipe leaks or the diaphragm splits,top gear is unobtainable I have found.
GOZZ.
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo help at all
« Reply #7 on: Nov 11th, 2010, 11:14pm » |
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GOZZ
Presumably that would also mean no turbo.
Geoff
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gozz
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Re: 2.5 Diesel no turbo help at all
« Reply #8 on: Nov 11th, 2010, 11:26pm » |
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Wouldn't think so Geoff,just no top gear.
GOZZ.
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo help at all
« Reply #9 on: Nov 11th, 2010, 11:36pm » |
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Wouldn't the loss of vacuum also stop the turbo from spinning up?
Maybe not then.
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo help at all
« Reply #10 on: Nov 16th, 2010, 1:41pm » |
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Connections all seem sound, no obvious leaks or whistles so going to try a replacement MAP and see if that improves matters.
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo help at all
« Reply #11 on: Nov 20th, 2010, 4:47pm » |
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Fitted the replacement MAP this afternoon, £29.95 new from e bay.
Is there any difference? Probably not. engine seems a little smoother up to 2500 rpm, no obvious pick up from turbo though I did read that the MAP may need programming.
Anybody know more about that?
Are there fault codes available on the 2.5 VM diesel and what sort of reader is involved?
Still find the the top two gears of the automatic box are identical so no overdrive in D apparent and no kickdown, further to Gozz's earlier comment I think that may be vacuum related as the diesel just has an A4LD box with no fancy electrics (I think).
Who are our resident diesel advisers, any ideas?
Geoff
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mazzy_j
Full Member
Posts: 664
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Re: 2.5 Diesel no turbo boost
« Reply #12 on: Nov 25th, 2010, 2:45pm » |
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On my auto derv the only sign of the turbo kicking in is a quiet whistle as the autobox seems to hide the kick my manual one has at about 1750rpm.
The torque converter lock-up engages in 4th (not sure if it does in 3rd aswell i've never noticed it) at about 50mph upwards at light throttle. I haven't had to touch any vacuum pipes to the geabox so can't comment on that I'm afraid.
No vacuum shouldn't effect the turbo, although i think on the later tds the wastegate is operated by a vacuum solenoid controlled electronically as apposed to using the pressure in the turbo itself to activate it.
What sort of state are the air and fuel filters in? When I first got my auto it lacked power and would take an age to start, turned out the fuel filter wasn't seated correctly on the larger top o-ring and so was letting air in. Probably unrelated but worth a quick look.
Matt
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo boost
« Reply #13 on: Jan 5th, 2011, 12:05pm » |
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Happy New Year!!!!
Update, fault Code P1225 Needle lift valve recorded and can't be cleared.
Would that fit with the situation?
Any ideas?
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: 2.5 Diesel no turbo help at all
« Reply #14 on: Jan 9th, 2011, 1:58pm » |
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The computer thinks there's a problem! So highly likely yes 
What's a "needle valve" do?
on Nov 11th, 2010, 11:36pm, Geoff_W wrote:Wouldn't the loss of vacuum also stop the turbo from spinning up?
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Turbo is spun by the exhaust gas.
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Mike H
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo boost P1225 fault code?
« Reply #15 on: Jan 9th, 2011, 6:53pm » |
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Thanks Mike,
I understand that.
In fact having had a look at this about the turbo
http://www.turbocharger-solutions.co.uk/faultdiagnosis
And this about the needle valve
http://www.engine-codes.com/P1225.html
I have a much better idea how things work on the 2.5 diesel than I did in November.
However still not got it sorted, hope to in the next week or so, but we shall see. 
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: 2.5 Diesel no turbo boost P1225 fault code?
« Reply #16 on: Jan 9th, 2011, 8:18pm » |
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hi Geoff
have you had the battery off this car?
if not, might be an idea as yours is a 'newer' diesel (iirc), it will have the 'fly by wire' throttle.
with the battery off, check around the throttle housing (if there is one) for any dodgy wiring and also at the throttle pedal.
i'm not completely sure how it all works, but if there's no cable attached to the throttle, it must get some sort of reading from the pedal.
if that signal is unreliable, then maybe it goes into a limp home type strategy.
hope this helps a bit.
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo boost P1225 fault code?
« Reply #17 on: Jan 9th, 2011, 10:19pm » |
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Thanks Andrew,
Good point, will disconnect battery and see what I can see.
In any case, having fitted a new MAP sensor it may welcome the chance to re-initialise afterwards.
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: 2.5 Diesel no turbo boost P1225 fault code?
« Reply #18 on: Jan 10th, 2011, 3:27pm » |
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Ah! So accelerator pedal just works a potentiometer. No Bowden cable. Dodgy potentiometer?
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Mike H
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: 2.5 Diesel no turbo boost P1225 fault code?
« Reply #19 on: Jan 11th, 2011, 8:11pm » |
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OK folks, does anyone have a link to the wiring diagrams for the injection and ECM systems on the 2.5 diesel? Or can anybody give me a steer as to where I can find them.
Ta
Geoff
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