AH FabricationsJMB Retrofits
Results 1 to 6 of 6
  1. #1
    Reverse Gear

    Status
    Offline
    Join Date
    Jun 2009
    Posts
    2

    low power A4 2.5 tdi

    hi im looking for some help- i have a 2000 A4 2.5 tdi quattro avant engine code AFB. it seems to be very low on power but its not "limp mode" as i have another car which does this and is very definite. i can hear the turbo spinning it just feels very sluggish. sometimes you can feel through the accelerator it almost wants to take off and give full power but is holding back.ive swapped from another car the same:MAF sensor,N75 valve, intercooler sensor.but it made no difference. no codes are logged on the ECU. Also the fuel consumption is pretty bad 18-20 mpg. dont know if its related but the coolant temperature dial sits around 70-75 degrees but i thought it should be 90.any help is much appreciated as ive gone through the forums and tried most things

  2. # ADS
    ADS
    Join Date
    Always
    Posts
    Many
     
  3. #2
    quattrojames's Avatar
    Moderator

    Status
    Online
    Join Date
    Mar 2008
    Location
    Dorset
    Posts
    13,856

    My Social Networking

    Follow quattrojames On Twitter Add quattrojames on Facebook
    Hi davey

    Have you had the car scanned for fault codes? Thats got to be a priority rather than try and make random guesses. The running temperature can't be helping things.

    Have you checked the turbo isn't sooted up? How many miles?
    Ingolstance Read about my A6 HERE.

  4. #3
    Neutral

    Status
    Offline
    Join Date
    Sep 2007
    Location
    North-East UK
    Posts
    96
    You could try changing the temperature sensor as it's reporting a low engine reading to the ECU and this may affect the power. Perhaps the engine limits the power/torque until it's fully warmed up?
    MY2011 A1 TDI Sport
    Amalfi White, Sat Nav, Bose, Xenon Plus, Climate Control, Competition Line Trim, LED Interior Lights, Light & Rain Sensors, Polygon 18" Wheels. Retrofit Armrest, Cruise Control & Gauge Sweep. VCDS.

  5. #4
    olds_kool's Avatar
    5th Gear

    Status
    Offline
    Join Date
    Jul 2007
    Location
    stoke on trent
    Posts
    1,071
    the vnt turbo on these can coke up, its fairly easy to remove and de coke it and taking hot side apart to clean doesnt affect balance so its worth trying
    mine was sluggish untill i cleaned it now goes like a rocket
    mine didnt have any fault codes logged either
    with temp sounds more like thermostat than sensor, belts off job!!
    kev
    a4 stuff http://shop.ebay.co.uk/merchant/olds_kool_gti
    99 1.8tqs black saloon
    99 1.8tqs grey avant
    90 eunos roadster

  6. #5
    Turkster's Avatar
    Bro.Paul 2.5TDI Quattro Sport

    Status
    Offline
    Join Date
    Dec 2007
    Location
    Northampton, Northamptonshire, United Kingdom
    Posts
    2,723
    the water temp could be the fault of the sensor. real easy to fix, cost about 30, if that fails then it could well be the thermostat being in the open position and not closing fully, my 2.5 had that issue,

    the thermostat is positioned behind the cam belt so its cam belt off to change that part, and then there is the water pump, which is a cam belt off job too,

    so if the temp sensor don't fix the issue then buy your self a new cam belt kit and get stuck in, or find a volunteer to do it for you,

    so if your water temp sensor is not giving the right reading then the cars ecu wont be telling the rest of the car what to do,

  7. #6
    Reverse Gear

    Status
    Offline
    Join Date
    Jun 2009
    Posts
    2
    ok, still have the low power problem but ive had it along a diagnostic company.he says there are no fault codes logged. He says when taking readings while the car is running the turbo is working ok, but the MAF is not getting enough airflow?? through it. ive tried a MAF off another car the same and it made no difference. hes checked the voltage from the MAF signal wire and its reading correctly. ive tried blanking off the EGR inlet pipe- made no difference. ANY IDEAS????

 

 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO