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  1. #1
    Reverse Gear

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    2.5tdi won't rev above 3500rpm?!?

    hi.
    i have a 1999 2.5tdi a4 avant that wont rev above 3500rpm, and isn't that quick getting there. doesnt feel like its in any kind of limp mode, but its as if its 'limited'?. i've unclipped the maf sensor and still no difference. it starts and sounds smooth as it should.
    could anyone shed some light on this as i've run out of ideas
    cheers

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  3. #2
    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    Try blocking off the EGR valve see how that helps it !
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F21 Kit - 3" MAF - Saab Reds - THS Decat - Non Res Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - PFR6Q Plugs - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do/planned -Eibach pro's - GT2871/76R + FMIC + ME7 (maybe) + Engine/stroker Build

  4. #3
    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    Also try cleaning the maf sensor with brake cleaner.
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F21 Kit - 3" MAF - Saab Reds - THS Decat - Non Res Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - PFR6Q Plugs - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do/planned -Eibach pro's - GT2871/76R + FMIC + ME7 (maybe) + Engine/stroker Build

  5. #4
    Reverse Gear

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    i've just seen a egr blanking plate on ebay, i'm ordering one and let you know
    thanks for the quick reply
    cheers

  6. #5
    3rd Gear

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    Try checking the turbo vane actuation - if it is sooted up and sticky, you will overboost and then go into a semi-limp mode.

    Mr Muscle fixes this! Un-Sticking Your TDi VNT Turbo Vanes.....
    1999 A4 B5 1.9 TDi FWD Saloon, Green SOLD
    2000 A4 B5 2.5 TDi Quattro Avant, Maroon, 'Panzer' Plated (currently sporting wrecked engine - and gearbox )
    2000 A4 B5 2.5 TDi Quattro Saloon, Blue, 'Panzer' Plated, Cruise Control retrofitted, OEM 6 Disc Changer retrofitted
    2006 A6 Allroad 3.0 TDi Blue, awaiting stuff to be done!

  7. #6
    Reverse Gear

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    Right.....cleaned maf sensor, de-coked turbo vanes with mr muscle, and blocked off egr valve. 1st and 2nd gear rev fine, but only to 3500rpm. 3rd - 6th still not quick, doesnt seem to be a limp mode just feels lazy getting there compared to 1st and 2nd, but still only revs to 3500, wont go past....running out of ideas as the engine runs sweet as a nut, starts fine, but at the moment its like theres a limiter on it?
    any help would be greatly appreciated....
    cheers

  8. #7
    3rd Gear

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    How about looking for air bubbles in the clear fuel line?
    The fuel filter can leak air at the tee-piece, which would be worse under high revs.
    1999 A4 B5 1.9 TDi FWD Saloon, Green SOLD
    2000 A4 B5 2.5 TDi Quattro Avant, Maroon, 'Panzer' Plated (currently sporting wrecked engine - and gearbox )
    2000 A4 B5 2.5 TDi Quattro Saloon, Blue, 'Panzer' Plated, Cruise Control retrofitted, OEM 6 Disc Changer retrofitted
    2006 A6 Allroad 3.0 TDi Blue, awaiting stuff to be done!

  9. #8
    "Stick a V8 in it!"

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    Does it rev past 3500rpm in neutral?

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  10. #9
    Reverse Gear

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    thanks for the replys. i'll try both suggestions tomorrow....keep you posted
    cheers

  11. #10
    Reverse Gear

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    hello again!!!
    just an update....
    checked for air bubbles at tee-piece, i presume thats the part that clips on top of the fuel filter, no bubbles seen after observing for a while, and the car revs to red line in neutral but not in gear, still only 3500. did a trip at weekend at a steady 70-75 and returned 35mpg, doesnt seem too bad, is this reasonable? still doesnt feel quick in 3,4,5,6. the mrs leon 110 tdi is a lot quiker, she's very competitive and is now taking the micky out of my beloved 2.5!!!! lol
    any others ideas?....

  12. #11
    S4_dan's Avatar
    Fire up the Quattro!

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    have you tried to Scan it with vag-com and see what is coming up?
    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

  13. #12
    6th Gear

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    revs round the revs in neutral but not under load......... is the advance/retard working in the fuel rotary pump? you need to get it on the diagnostics to check it.

  14. #13
    Reverse Gear

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    Hi thanks for your assistance by PMs
    i had a look at cat and mine was clogged up so cut out and now it pull like a train
    i drilled a small hole in front and looked in with enderscope then cut pipe before and after cat and fitted a section of pipe
    i might need to find a cat for MOT
    regards Andy

 

 

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