1.9TDi loss of power - help please!

[curlyks2]

My daily run around is a 2002 Seat Leon 1.9TDi. Driving home this evening the power suddenly dropped off (could really feel it drop). No warning lights, still runs and sounds fine, and accelerates from standing ok, but there's **** all power anywhere up the rev range. I'm tempted to think that an intake pipe has sprung a leak, either turbo to intercooler (which I can't get at or even really see) or intercooler to manifold (which I can see and looks ok). Anyone got any other thoughts or suggestions?

Ck.

[Fat Audi 80]

Hi Erik,

That would be my first thoughts. We had similar on my Mum A3 TDI and the intake pipe was "off"

It should not be too hard to check. (Apart from its dark now!)

Good luck.

Cheers,

Steve.

[mark_s2]

Have had this issue several times with my A3 - MAF.

[s2driveruk]

had this on my a6 tdi recently and ended up being a knackered vac line. Could also be the variable vane actuator on the hotside of the turbo sticking, mine was coked up and stopping the turbo spining freely. Had to disconnect the downpipe and spray liberally with brake cleaner and rotate manually until I could free everything up properly.

If its done reasonable milage, then might be worth looking at the EGR value too and cleaning it, I was absolutely staggered at the amount of cr*p on mine and eventually ended up cleaning the intake path and manifold.

[Ross]

Damn David, that's nasty! I've heard this is worth doing on a high-mile engine, guess I'l l have to get the rubber gloves out when it warms up a bit and clean out the manifold...

On-topic, had this problem just the other day whilst passing up a steep hill. Once I'd down-shifted and pulled back in, keeping it on 3K revs just to get a little power, I tried backing off and then getting back on and it was evident there was no noticable boost. there were no warning lights either. Pulled over and shut it off, checked hoses etc but nothing obviously. When I started off, it was OK although pulling a bit hesitantly, and felt a down on power.

I had some further hesitation and bad MPG for a couple of days; it was also hesitant starting cold. I thought it could be contaminated diesel as I'd only recently filled up, so topped up with shell and there was a noticable difference but still not right; however a few days later and it is now fine. I'm suspecting moisture in the fuel tank possibly, causing it go into limp-home mode.

Hope it's nothing serious!

Cheers,
Ross

[curlyks2]

Thanks guys, a few things to check there - probably at the weekend in daylight! If nothing else, I've got an excuse to take the Audi today...

Ck.

[s2carlo]

We had the same on our 1.9TDI A6.
The misses came home and stated "there is something wrong with te car, it doesn't pull a package of butter of the table...".
I took a quick look in the half dark, didn't notice anythin.
Looking in the light a hose was pulled of of the turbo.
Remounted and all was OK again.

Good luck

[iain1067]

Bad maf would be my guess, tdi's seem to eat them you got in on vag com yet??? any codes???


Iain

[s2driveruk]

one additional word about MAF's - be careful what you buy. I bought a cheap ebay replacement MAF for the a6 as initially I thought it was that which was at fault, turned out not to be but ran it in the car for a while and it introduced some off throttle jerkiness and hesitation. changed back the the Bosch OEM unit and hey presto...smooooooth running again!

[curlyks2]

And our survey says... limp mode triggered by too much boost. Fault cleared, driving fine now. Nothing appears off, broken, leaking, etc.

Ck.

[s2driveruk]

glad you got it sorted

[curlyks2]

Ta Fingers crossed it stays fixed - whatever caused it!

Ck.