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AndyT
Moderator Group Joined: 16 May 08 Location: Ammanford Status: Offline Points: 2274 |
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Posted: 09 Aug 18 at 18:34 |
Hi Guys, Can you recommend anyone in South Wales, my Audi A6 2.5tdi won't rev over 3k. I'm changing the cheaper sensors myself, coolant temp etc, but will probably need an expert diagnosis. Have VCDS and it only shows 1 error code - 00575 Intake manifold pressure, 11-10 Control limit not reached. Cheers Andy
Edited by AndyT - 09 Aug 18 at 18:34 |
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LT28 1979 2.0 Pampas Nevada Camper LPG 93K, 1980 T3 A/C Camper 98K,1994 RRC 3.9 LPG 120k , 1998 Audi A6 Est 2.5 V6 diesel 127k
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ob1
Yardie FOUND IT, IT WAS HIDING! Joined: 11 May 08 Status: Offline Points: 732 |
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That’s in limp mode due to intake boost leaks / intercooler failure I’d guess?
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AndyT
Moderator Group Joined: 16 May 08 Location: Ammanford Status: Offline Points: 2274 |
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Not happy for sure, have vac tubing on the way, will change every bit I can find, also have coolant and oil sensors ordered. Don't want someone who changes very expensive parts until it's fixed or not, you just get the bills. Haven't dismantled the turbo, but the VNT mechanism moves fine by hand.
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LT28 1979 2.0 Pampas Nevada Camper LPG 93K, 1980 T3 A/C Camper 98K,1994 RRC 3.9 LPG 120k , 1998 Audi A6 Est 2.5 V6 diesel 127k
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doug
Groupie Joined: 12 May 05 Location: sunny sussex Status: Offline Points: 58 |
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That failure code should originating from your map sensor
Manifold absolute pressure It will be situated on your turbo to intake run As suggested could be the pipes are leaking thus no pressure reading or variable vane turbo is sticky thus over boosting Both will trigger limp mode The sensor it self could be at fault Good luck |
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randolph57
Yardie Joined: 21 Dec 08 Location: plymouth Status: Offline Points: 395 |
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That code certainly indicates not enough boost achieved when related to boost expected. Could be vacuum lines as stated boost hoses to inlet manifold split/leaking /leaking intercooler or possibly failed Vnt vacuum can on turbo. Does the vnt arm move approx 15mm to its 'stop'when engine started?
Other possibilities could be a defective N75 valve meaning your turbo would be basically doing not a lot with no control over turbo nozzle ring. Plenty of them in local scrapyards . |
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AndyT
Moderator Group Joined: 16 May 08 Location: Ammanford Status: Offline Points: 2274 |
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Thanks for the replies guys, got sent the wrong size vac tubing so not much progress so far. Hopefully tomorrow will have VCDS & Elsawin running on an old laptop, and will be doing some graphs which might narrow things down a bit. I've identified some of the sensors and valves but there are shed loads of em.
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LT28 1979 2.0 Pampas Nevada Camper LPG 93K, 1980 T3 A/C Camper 98K,1994 RRC 3.9 LPG 120k , 1998 Audi A6 Est 2.5 V6 diesel 127k
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