Toledo Tdi 110- very intermittent power loss

[LASTYBOY]

I have a 2001 TDi 110SE Toledo.
This car drives fine but normally after a 10-25 mile drive it goes into limp mode. Very slow no performance at all. Before then, perfect performance. If i switch it on and switch it off, it is fine for a little while.
It doesnt do it every trip but say every other day.
I dont think it is a turbo problem. Im hoping it is a an air mass meter but would think the fault would be more regular if this was the case.

Any ideas??

 

[sssstew]

MAFs very rarely cause limp mode problems. What are you doing when it happens, are you hard accelerating?

Why dont you think its a turbo problem?

Really you need to get vag com onto it to see what faults been logged.

 

[LASTYBOY]

Well it has gone faulty again and i connected it up to the software. Faultcode 17958- which is

 

[LASTYBOY]

sorry turbo charger pressure difference so could be turbo

 

[sssstew]

yep pressure devation. so either a boost leak or sticky vanes on the turbo.

 

[LASTYBOY]

cant find any leaks any where. Did notice a little bit of oil in the egr valve but that is it.

 

[sssstew]

how did you check for leaks?

If its not that then it will be sticky turbo vanes, needs removing and cleaning up.

A little oil in the egr is normal.

 

[pauloliver]

just to put the MAF out of the question, disconnect it, if she runs more consistently, then you have a faulty MAF.

well at least it worked for me....

 

[Muttley]

Does it go into limp mode at motorway speeds, 50-70 ish? If so it could be the EGR valve sticking open. EGR should only open at mid-revs, and be shut at full chat. When they get gunged up they can stick open, just a little, but enough to let exhaust pressure in as you try to open up - the ECU sees this as overboost and puts you into limp mode.

Simple check - disconnect the electrical connector to the EGR control valve (on the bulkhead) and see if the problem goes away.

Remedy: Clean the EGR valve.

 

[LASTYBOY]

I did clean the EGR valve but to no avail. I found that if i did 60 mph in top and floored it, the car would go into limp mode between 65-75 mph every single time i drove it like this.

Just to say that i disconnected the turbo thrusday afternoon and dismantled it. The whole unit was covered in soot. Only one vane was slightly sticky. However the actuator rod was quite stiff. After a thorough clean of the whole unit i put it all back together.
The result??
Full boost at all revs and i tried flooring it at 60mph and it went straight to 100mph at full boost many times with no trouble at all. Looks like it is all fixed.
2 days later, still fine.

Many thanks for all your help

 

[sssstew]

ding! glad its sorted.