TDI lacking power
- Thread starter johnyfartbox
- Start date
I had something like this with my student 2CV back in 2003 in Dundee. Half-filled the tank one night at Tesco before heading to Birmingham where I was due to show to a potential buyer the next day. Somewhere south of Glasgow the car started running intermittently on one cylinder or the other for miles with a very rough power delivery, fuel consumption through the roof, strong dieselly smell etc - had to drive for miles on full throttle to keep one cylinder running until I got close to a service station (instead of being stuck miles from anywhere in the dark with no mobile reception!). I managed to refill at Tebay services with premium detergent-laden petrol and within minutes it ran like a dream for the last 180 miles to my destination and eventual sale. A few days after my return the local Scottish papers were full of stories about unbranded tankers supplying diesel-contaminated fuel to supermarkets in Dundee in that window that caused no end of AA call outs for rather more modern cars that ended up with expensive repairs to fouled fuel systems and the like. Junk in the petrol pumps does happen!
Shonky Geeza
Member
Hi Guys, I just love how all this information is available to search. This sounds like my exact situation. I have the fuel filter ready to replace. However Im concerned the fuel filter housing bolt may throw me a curved ball. How can I get hold of the said aftermarket screw just incase, depronman?
Robthebank
Member
@depronman
Add the @ sign to guarantee a response, I’m a happy customer of the upgraded drain screw.
Shonky Geeza
Member
Shonky Geeza
Member
Thanks to the forum and the contributions from you folks I have resolved my fuel starvation problem. 2005 A2 1.4 TDI 132K. Between 2250- 2750 I have a "flat spot" in all gears whilst accelerating but managed to drive through it however it was progressively getting worse. Acquired the correct tooling and set about it. I also followed advice and purchased a custom made drain plug from @depronman . I was fortunate that the plastic drain screw didnt snap off. With the screw out bearly a drip of black fuel came out! With the 27mm socket i gingerly applied pressure and slowly released the the plastic housing. As advise about 300mm of fuel drained out. Revealed was a very dirty black filter, possibly never been changed from new. Reassembled with the replacement aluminium drain screw and left to stand for 30 minutes. Started up, this wasn't long enough is it cut out on me, left it another 15 minutes and cranked it over for a while and bingo running sweet. Happy to report this solved the fuel starvation/flat spot issue for me.
johnyfartbox
A2OC Donor
Makes you wonder how it actually starts when it's gunged up like that my lads was exactly the same.
depronman
A2OC Donor
That’s one fell used fuel filter
Recommend that you drain about a cup full of fuel / water from the drain screw every 6 months
The water will collect at the bottom of the filter housing and is the real purpose of the drain screw
Paul
Sent from my iPhone using Tapatalk
dj_efk
A2OC Donor
Digging up an old thread - recently my engine light came on and I had a new fault to join the party of codes appearing under the engine block in CDIS as well as the cam sensor - the MAF sensor ist kaput.
This has been accompanied by very occasional loss of power and stalling. Luckily I just happened to have a new genuine Bosch replacement in my stash that I think I bought cheaply off another member early last year.
The old one is a pattern part (go figure - said it before and will say again - only use genuine Audi or Bosch engine sensors!). However see the pic below comparing the old above the new. The new one has two brass fork holders just where the pattern one does - but does not have the wire that connects them. Seems odd?
This has been accompanied by very occasional loss of power and stalling. Luckily I just happened to have a new genuine Bosch replacement in my stash that I think I bought cheaply off another member early last year.
The old one is a pattern part (go figure - said it before and will say again - only use genuine Audi or Bosch engine sensors!). However see the pic below comparing the old above the new. The new one has two brass fork holders just where the pattern one does - but does not have the wire that connects them. Seems odd?
dj_efk
A2OC Donor
Well it’s on the car, the engine has been run, the engine light is out and the code hasn’t reappeared following my clearing them - just the cam sensor code as before.
So whilst I haven’t driven the car yet, the new part seems to work fine where the old one did not!
It’s odd though isn’t it. Does anyone have a genuine part they could post a pic of just to check?
So whilst I haven’t driven the car yet, the new part seems to work fine where the old one did not!
It’s odd though isn’t it. Does anyone have a genuine part they could post a pic of just to check?
Last edited:
D
Deleted member 15819
Guest
Sometimes it can be the act of unplugging the sensor then plugging it back it can clear faults as the pins in the plug wipe the contact areas. If you look the top of the wiring plug could potentially fill with water.
Sorry I do not have a spare sensor to check for you.
Sorry I do not have a spare sensor to check for you.
dj_efk
A2OC Donor
Understand how that could be the case - Well knowing I’ve changed a pattern part out for a Bosch is for me peace of mind.
Hopefully someone else has a spare genuine one they could post a pic of, but if it continues to work as it should then all OK!
Next stop is that cam position sensor - is there a tutorial somewhere? I had a quick look but couldn’t seem to find anything definitive.
Hopefully someone else has a spare genuine one they could post a pic of, but if it continues to work as it should then all OK!
Next stop is that cam position sensor - is there a tutorial somewhere? I had a quick look but couldn’t seem to find anything definitive.