EdBe
17-04-2008, 08:57 PM
Hi, I’m having intermittent turbo failure on a 2002 1.9TDI Octavia Elegance 110bhp.
I know this topic comes round again and again (and i have read the other posts) but hope this will generate some interest ...:)
I’ve just phoned a skoda dealer for a price and advice on error code downloads and they gave me the general impression that on the older Octavias the fault codes can be a bit generic and they would have to set to testing components, something that I would enjoy doing anyway. . . .
Symptoms
Engine going into limp mode, always on a long hill under load and mostly in 4th gear around 3,000rpm
Also, occasionally there is a noise like “a person with a cold taking a sharp intake of breath” 2 or 3 times in succession on acceleration up a hill, this causes engine to back off with each noise, does not coincide with engine going into limp mode though.
Action taken so far
·The VNT lever was very stiff and movement seemed limited, I have worked the lever with a dowel rod and a release lubricant and movement has returned, the stiffness seems to be of similar level to our other car (1.9 TDI Octavia Ambiente 90bhp).
·On revving the engine the VNT moves, I have also vacuum tested the long pipe to the turbo which is ok.
·Have swapped the N75 from our ambiente to the elegance car but the valves must be of a different spec as elegance power was very limited with the ambiente N75.
·The N75 valve on the ambiente seems to have a better sound to it, “toc” when I manually sucked the pipes, the elegance one sounded a bit weepy but don’t know if the valve is one way or just restricted flow. I think the ambiente valve let flow both ways, although heavily restricted one way…
·The EGR butterfly valve seems to move freely, and when switching the engine on and off the vacuum plunger moves ok, which moves the VNT up and down ok. (or is that the N75 doing the latter ?)
·Running the engine with the EGR pipe (the one from the top of the EGR to the valve on the bulkhead) disconnected and plugged made no difference, still limped
·I have also cleaned the MAF if that makes any difference.
Has anyone got any ideas for further testing ?
Where is the MAP sensor and can I do any kind of test ? – is this attached to the inlet manifold ?
Any suggestions gratefully received
Thanks
Ed.
I know this topic comes round again and again (and i have read the other posts) but hope this will generate some interest ...:)
I’ve just phoned a skoda dealer for a price and advice on error code downloads and they gave me the general impression that on the older Octavias the fault codes can be a bit generic and they would have to set to testing components, something that I would enjoy doing anyway. . . .
Symptoms
Engine going into limp mode, always on a long hill under load and mostly in 4th gear around 3,000rpm
Also, occasionally there is a noise like “a person with a cold taking a sharp intake of breath” 2 or 3 times in succession on acceleration up a hill, this causes engine to back off with each noise, does not coincide with engine going into limp mode though.
Action taken so far
·The VNT lever was very stiff and movement seemed limited, I have worked the lever with a dowel rod and a release lubricant and movement has returned, the stiffness seems to be of similar level to our other car (1.9 TDI Octavia Ambiente 90bhp).
·On revving the engine the VNT moves, I have also vacuum tested the long pipe to the turbo which is ok.
·Have swapped the N75 from our ambiente to the elegance car but the valves must be of a different spec as elegance power was very limited with the ambiente N75.
·The N75 valve on the ambiente seems to have a better sound to it, “toc” when I manually sucked the pipes, the elegance one sounded a bit weepy but don’t know if the valve is one way or just restricted flow. I think the ambiente valve let flow both ways, although heavily restricted one way…
·The EGR butterfly valve seems to move freely, and when switching the engine on and off the vacuum plunger moves ok, which moves the VNT up and down ok. (or is that the N75 doing the latter ?)
·Running the engine with the EGR pipe (the one from the top of the EGR to the valve on the bulkhead) disconnected and plugged made no difference, still limped
·I have also cleaned the MAF if that makes any difference.
Has anyone got any ideas for further testing ?
Where is the MAP sensor and can I do any kind of test ? – is this attached to the inlet manifold ?
Any suggestions gratefully received
Thanks
Ed.