Hudster Posted September 12, 2006 Report Share Posted September 12, 2006 Hi all, The golf is a bit hesistant on acceleration, and I got the following from vag-com: 2 Faults Found: 17536 - Fuel Trim: Bank 1 (Mult): System too Lean P1128 - 35-00 - - 17705 - Pressure drop between turbo and throttle valve (check DV) P1297 - 35-10 - Intermittent can anyone suggest a possible fault, or even explain what the DV is?! car is Golf 1.8T 2001 with about 63k, recently had new cam belt, water pump and turbo pressure valve Link to comment Share on other sites More sharing options...
PetrolDave Posted September 12, 2006 Report Share Posted September 12, 2006 DV = Dump Valve. Opens to reduce the boost pressure when it thinks it's too high, could be faulty. Link to comment Share on other sites More sharing options...
Paul Posted September 12, 2006 Report Share Posted September 12, 2006 Clear the faults see if they come back after a few days. if you have already replaced the DV. (if this is what you mean by turbo pressure valve) then i should hope that one is an old one and will go away. Too lean is not enough fuel. could be either, a faulty maf (mass air flow sensor in the exit of the air box lid) sodding up the fueling to wrong air flows (most likely) or a less likely lamda sensor giving the wrong measurements. Link to comment Share on other sites More sharing options...
Hudster Posted September 12, 2006 Author Report Share Posted September 12, 2006 I cleared the faults on Saturday afternoon and they had returned by Sunday (within 150 miles). I had suspected a faulty MAF, they seem to be a common problem, but is there any way to check the MAF before buying a new one? Also is this something I can do myself or is it best left to a mechanic? Link to comment Share on other sites More sharing options...
Hudster Posted September 12, 2006 Author Report Share Posted September 12, 2006 [ QUOTE ] if you have already replaced the DV. (if this is what you mean by turbo pressure valve) then i should hope that one is an old one and will go away. [/ QUOTE ] I (well VW) replaced the Boost Pressure Control Valve earlier this year after getting the fault [17608 - Boost Pressure Control Valve (N249): Mechanical Malfunction] but I assume this isn't related to the new fault? Link to comment Share on other sites More sharing options...
Paul Posted September 12, 2006 Report Share Posted September 12, 2006 N249 controls the DV. so it may be best to replace the DV, they are about £15 from vagparts.com, at the very least have a look over the pipes for leaks/splits loose pipes. Maf can be diagnosed by vagcom, by logging, but only if your familiar with the figures it should be presenting. Audi charge about £80 for a service exchange maf. Link to comment Share on other sites More sharing options...
Hudster Posted September 12, 2006 Author Report Share Posted September 12, 2006 just been out and can't find any leaks in the hoses, I think my plan of action will be to clean the MAF and then look at replacing it if that doesn't solve the problem sensible to do the DV at the same time? it says on this website that the MAF is guaranteed for 7 years, does this apply to the UK too? Link to comment Share on other sites More sharing options...
Paul Posted September 12, 2006 Report Share Posted September 12, 2006 I wish. No, they have nothing like that here. id expect 12 Months on a new one. Link to comment Share on other sites More sharing options...
Hudster Posted September 12, 2006 Author Report Share Posted September 12, 2006 thought it sounded too good to be true! more fun to be had with my local stealership, yipee thanks for your help Paul Link to comment Share on other sites More sharing options...
sitas3 Posted September 12, 2006 Report Share Posted September 12, 2006 try unplugging the maf, then clear the error codes and run without the maf connected and see if the error codes come back. Link to comment Share on other sites More sharing options...
Hudster Posted September 12, 2006 Author Report Share Posted September 12, 2006 [ QUOTE ] try unplugging the maf, then clear the error codes and run without the maf connected and see if the error codes come back. [/ QUOTE ] good plan! thanks I'll give it a try tomorrow Link to comment Share on other sites More sharing options...
Hudster Posted September 16, 2006 Author Report Share Posted September 16, 2006 I've cleaned the MAF now and checked the readings using VAG, and now believe the problem is caused by a VAC leak somewhere. I've checked the hoses I can see for leaks, and have only found one possibility (see pic below) but it doesn't look like it's wide enough to cause any problems. Could anyone indicate on the pics where I should be looking for a leak please? Link to comment Share on other sites More sharing options...
Hudster Posted September 16, 2006 Author Report Share Posted September 16, 2006 this is the only possible leak I can see, but the gap doesn't look big enough as the hose is still snug over the pipe, any ideas? Link to comment Share on other sites More sharing options...
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