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xamtex

Active Member

• Aug 8, 2016

• #1

after finally getting my 2001 td4 auto to run again and get it mot,d and back on the road it has another issue now.
when i press the throttle it runs smooth to 4k rpm,then its like it hits a rev limiter...the revs drop then rise up and down with the throttle held in the same position.
hawkeye comes up with P0235...i clear the code but it comes back after a while...sometimes hawkeye says......boost pressure sensor short(open load or to ground).....another time hawkeye will say boost pressure sensor plausability with atmospheric pressure at idle.
i have changed the boost pressure sensor and checked the pipework as best i can......any ideas?

 

Skinny Mike

Well-Known Member

• Aug 8, 2016

• #2

When you say you replaced the pressure sensor, do you mean the MAP sensor, if so did you use a cheapo or an OEM part.

Other than that, check vac pipes, turbo hoses, is there enough oil/ is it any good?
Mike

 

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xamtex

Active Member

• Aug 8, 2016

• #3

i put a new sensor on the o/s of the manifold...turbo boost sensor...cost me just under 60 quid trade,not an ebay special.
several boost hoses were replaced in the last year,all the little pipes look in good order.its due its mot oil change but it stood 6 months after its last oil change so the oil has done no mileage.

 

Skinny Mike

Well-Known Member

• Aug 8, 2016

• #4

Could be a bad connection, or a dodgy earth, but as it's OK most of the time it's unlikely, but check em anyway.
As it's been stood quite a bit, I'd go steady with it for a while. Keep things under 3000rpm(its quite easy to do with an auto) let things bed in. It might sort itself if your lucky.
But I'll keep thinking. Someone else might have another idea.
Mike

 

Joe_H

Well-Known Member

• Aug 8, 2016

• #5

sounds like a wiring issue - check the cabling to the map sensor. Also use the hawkeye to monitor the map voltage and see what is happening.

 

asnitker

Member

• Aug 8, 2016

• #6

xamtex said:

after finally getting my 2001 td4 auto to run again and get it mot,d and back on the road it has another issue now.
when i press the throttle it runs smooth to 4k rpm,then its like it hits a rev limiter...the revs drop then rise up and down with the throttle held in the same position.
hawkeye comes up with P0235...i clear the code but it comes back after a while...sometimes hawkeye says......boost pressure sensor short(open load or to ground).....another time hawkeye will say boost pressure sensor plausability with atmospheric pressure at idle.
i have changed the boost pressure sensor and checked the pipework as best i can......any ideas?

Click to expand...

I found this list - I dont know if you can use it:
http://www.freel2.com/gallery/albums/userpics/11383/dtc_codes.txt

 

Skinny Mike

Well-Known Member

• Aug 8, 2016

• #7

Done a bit of research (wife's watching gymnastics, yawn!)
It's coming back to the MAP sensor or wiring. Take it back off, clean connector, check the little hole isn't blocked on the tube thing, put it back on tight, but not over tight.
Mike