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wheres the power going ?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Turkster, Aug 20, 2010.

  1. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    My 2.5 TDI is having an small issue, from stand still if you floor it the power is just not there, she takes off at an ok speed, by the time the car has choked to the end of the gear it flys off in 2nd gear a lot better and the turbo kicks is, 3rd,4th, 5th and 6th are there ok,

    I unplugged the EGR valve and wooosh off she goes like a bomb, but pipe that goes onto the EGR valve is not blocked so its classed as leaking? when i block the pipe with a bolt the car takes off ok but not as powerfull, The EGR valve is on 2 years old as iv changed it before, the pipe that connects to the EGR valve is sucking good,

    Do you think it could be the actuator on the Turbo sticking ?
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  2. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    MAF perhaps?
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  3. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    im going to test it today, do you think it would cause an issue like this ?
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  4. NHN
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    NHN Modmetractor

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    Sticking vanes maybe if yours has this type of turbo?
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  5. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    its a turbo as below, not my picture, iv borrowed it,[​IMG]
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  6. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    Mine had similar symptoms when it went. Give some thought to getting it tested with Vagcom and see's what it shows. Sticking vanes are also possible though so it's going to be a bit trial and error I imagine.
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  7. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    where abouts is that bit that you said ?
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  8. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    The variable vanes in the turbo, they can get clogged up with soot.
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  9. NHN
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    NHN Modmetractor

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    Yeah removal of turb needed for that mate, can be done yourself if you're technically minded/confident & dont bother with that turbo cleaner people mention, it hasnt been that successful & no doubt if its burnt on grime, it wont come of that easily & the cleaner weill only do surface grime not down to the bare metal IMHO thus will get clogged again fairly easily if it helps at all in the 1st palce that is, if you want a longer lasting turb then removal & clean properly would be best, only IMHO.
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  10. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    Well sunday is upon us, i have a free day so im gonna take the Turbo off and change it with another one i just so happen to have, i can sometimes predict the future, LOL, what would you recoment cleaning it out with then mate ?
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  11. NHN
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    NHN Modmetractor

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    Wire brush to start with, obviously observing part strength etc, but you obviously have alot of cmmon sense so sure you'll be ok mate:)

    Anything really that would brake down the grime of metal, have a looksy in halfords, they will have something, you could ask a few of the detailiers on here or detailing world what they know available locally today that breaks done grime on metal easily.
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  12. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    Im sure a bit of TFR or a oven de-greaser agent should do the trick, I may have to lay this job off till monday and take advantage of my workshops tools and really go to town cleaning out the double alloy air channels that feed the engines, the last time i changed the EGR valve i cleaned them out too then was fairly gunky too, 201k miles is gonna get a build up in places, I will get some photos and post them up, could be of some help to the others in the future,
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  13. NHN
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    NHN Modmetractor

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    How many engines has your car got then :p

    Yeah be nice to see what state its in, at 200k feck me thats lasted well if its original, given its a derv then chances are its clogged.
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  14. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    its got 2 engines, i say two as its a V6, 2 engines collectively powering the same crank, i could be wrong with that statement but its kinda how is see it, 2 heads = 2 engines and 2 lots of bills and 2 times the chance fore a problem to cost you 2 lots of money,
    Last edited: Aug 22, 2010
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  15. NHN
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    NHN Modmetractor

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    Well I guess if you look at it like that then who am I to disagree lmfao.
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  16. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    LOL, my daughter who is 6 now asked when i got it a few years back asked me why its got 2 engines when i showed her it, it kinda made sense and has stuck in my mind as 2, gotta pop out for lunch now bro, chat later,
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  17. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    umm, today did not go as planned, but i did get under the bonnet for a sniff about, the MAF is most certainly in the frame here, the car seems to run better with it un plugged!

    Im now looking at the BMC pannel filter i put in about 2 months ago and i wondering if its got a part to play in all of this? Do the sports pannel filters let in to much **** as much as extra air? or was it just time at the bar folks for the MAF?
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  18. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    Sounds like the Maf then - what filter have you got? Some of the oiled filters can cause the Mafs to go haywire.
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  19. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    BMC pannel filter, I may put the standard one back in, well a new one, new MAF are only £89.50from GSF with a £89.50 Surcharge! (best take it out in there car park and slap it on the desk to save on the Surcharge!
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  20. NHN
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    NHN Modmetractor

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    Give audi a shout, they're not always more expensive, mine was like £70 with £20 surcharge.

    Still think 200k on a derv would most certainly leave the turbo clogged to a degree & only doing yourself favours by cleaning it anyway.
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  21. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    Audi want 110 and GSF want 90, both made by the same people ?
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  22. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    New MAF fitted , car feels better but still is unwell, gonna strip it down tomorrow, the gloves are off!
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  23. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    The gloves came well off today, Gave all the bits a good clean up, EGR valve, crank case filter, injectors off, Turbo changed, air manifolds, everything got de-greased and de-gunked, After the turbo failing on me last year and all that oil being leaked into the air system it was a fairly poor site to see the damage it had done in there, even after a years worth of driving,
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  24. NHN
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    NHN Modmetractor

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    Whats the state of the turbo internals?
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