woodyrvf750 Posted April 9, 2019 Report Share Posted April 9, 2019 Hi I've done about 30k km in my 3l over the last 12 months in my second period of owning this amazing machine. At the weekend we did a 300 mile round trip and started loosing power. This hasn't happened before I pulled over and had a look at the turbo. From the attached photo it looks like the turbo inlet pipe is working its way away from the turbo. I wiggled it back on and this immediately restored power. Anyone else had this problem? Is this a likely cause of power loss or should I be looking elsewhere? Thanks. Quote Link to comment Share on other sites More sharing options...
Sausage Posted April 9, 2019 Report Share Posted April 9, 2019 I assume you turned it off to wiggle the pipe and then turned it back on to immediately restored power? Turning it off then on is a known fix for several things that could have kicked it into limp mode. Get fault codes read. It could be sucking in air there beyond the maf and kicking it to limp mode. 1 Quote Link to comment Share on other sites More sharing options...
woodyrvf750 Posted April 9, 2019 Author Report Share Posted April 9, 2019 Thanks Sausage. Just downloading latest version of Ross Tech, will read codes and report back Quote Link to comment Share on other sites More sharing options...
woodyrvf750 Posted April 9, 2019 Author Report Share Posted April 9, 2019 I did turn it off to poke around, so maybe turning off and on reset it rather than my pipe adjustments. Here's the fault; 1 Fault Found: 17964 - Charge Pressure Control P1556 - 35-10 - Negative Deviation - Intermittent Readiness: 0 0 X X X Which gives this this on the Ross Tech site; Possible Symptoms Reduced power output Limp mode Possible Causes Boost Pressure too Low Hoses/Pipes incorrect connected, disconnected or leaking Charger Pressure Control defective VNT (variable nozzle turbo): nozzles stuck Solenoid Valve for Boost Pressure Control (N75) defective Possible Solutions Check Hoses/Pipes to/between Components Check Solenoid Valve for Boost Pressure Control (N75) Check / Clean / Replace Charge Pressure Control Check / Clean mechanism for variable nozzles Looks like the poor fitting hose could be the problem. Shame they aren't available from VW. I'll look to make up some kind of large washer to hold it in place. Anyone got a known fix? Thanks Quote Link to comment Share on other sites More sharing options...
Sausage Posted April 10, 2019 Report Share Posted April 10, 2019 (edited) It's more likely the boost side of things and your pipe there is a red herring as there is (or should be) an O ring in the joint to make the seal. https://volkswagen.7zap.com/en/rdw/lupo++lupo+3l+tdi/lu/2001-231/1/129-129023/ Make sure the actuator (charge pressure control) moves when activated in vcds and that the vanes it operates arent stuck with carbon. Edited April 10, 2019 by Sausage Quote Link to comment Share on other sites More sharing options...
woodyrvf750 Posted April 10, 2019 Author Report Share Posted April 10, 2019 I think you're right, I took the inlet pipe off yesterday evening and it looked fine with the O ring still in good condition. I'll see how the actuator functions next. Quote Link to comment Share on other sites More sharing options...
woodyrvf750 Posted April 10, 2019 Author Report Share Posted April 10, 2019 Sausage, could you point me in the right direction on how to test the charge pressure control with vcds? Thanks Quote Link to comment Share on other sites More sharing options...
Sausage Posted April 10, 2019 Report Share Posted April 10, 2019 https://www.myturbodiesel.com/wiki/vnt-turbo-actuator-adjustment-repair-replacement-on-tdi-engine-mk4/ 2/3rd the way down. where it says Procedure. Quote Link to comment Share on other sites More sharing options...
Ivan3L Posted August 25, 2021 Report Share Posted August 25, 2021 (edited) On 4/10/2019 at 2:45 PM, woodyrvf750 said: Sausage, could you point me in the right direction on how to test the charge pressure control with vcds? Thanks Hi woody, I've the same problem on my 3L. Same fault code + MAF (16485) + a big boost leak sound. Inlet turbo pipe...that's the same as yours too. Have you solved your problem? Ivan Edited August 25, 2021 by Ivan3L Quote Link to comment Share on other sites More sharing options...
woodyrvf750 Posted October 11, 2021 Author Report Share Posted October 11, 2021 Hi Ivan3L, my turbo actuator was sticky, the garage just sprayed it with some lubricant. I'm sure it will need changing again soon. My 3L has been off the road since the start of this month & I'm just about to give it a good service to get it up and running again. Quote Link to comment Share on other sites More sharing options...
RAB Posted October 21, 2021 Report Share Posted October 21, 2021 On 10/11/2021 at 9:39 AM, woodyrvf750 said: Hi Ivan3L, my turbo actuator was sticky, the garage just sprayed it with some lubricant. I'm sure it will need changing again soon. My 3L has been off the road since the start of this month & I'm just about to give it a good service to get it up and running again. I would say that the VNT mechanism is gummed up. Your turbo needs an overhaul. In future try using non-supermarket fuel; supermarket fuel lacks the additives to keep the VNT mechanism clean. RAB Quote Link to comment Share on other sites More sharing options...
Ivan3L Posted November 14, 2021 Report Share Posted November 14, 2021 On 10/21/2021 at 10:22 AM, RAB said: I would say that the VNT mechanism is gummed up. Your turbo needs an overhaul. In future try using non-supermarket fuel; supermarket fuel lacks the additives to keep the VNT mechanism clean. RAB That's it! I overhauled the turbo and everything is perfect again! After that only supreme fuel and additives. Thank you Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.