banny Posted January 15, 2006 Report Share Posted January 15, 2006 17968 - Charge pressure: Control Deviation P1550-08-10 - Control limit surpassed -intermittent 17552 - Mass Air Flow sensor (G70) : open or short to ground P1144 - 35 - 00 - - Readiness N/A Link to comment Share on other sites More sharing options...
Paul Posted January 15, 2006 Report Share Posted January 15, 2006 first one I am not familiar with. second one Either your MAF is Knackered, or unplugged MAF is the sensor in or down stream from the airbox. it measures air flow into the engine. It may be worth clearing the faults first and seeing if they come back, certainly before spending any money. Its always possible that they have been fixed already, or the situation has ceased Link to comment Share on other sites More sharing options...
banny Posted January 15, 2006 Author Report Share Posted January 15, 2006 well car is down on power. its alright until you hit 3000-4000 revs, then loose's power, so have to turn ignition off to get it to return to normal. Its Ok if you drive it steady, which is OK, but we like abit of grunt dont we. Have tried putting some dialectric grease on connection to see if it is any better. It is no better is you unplug the MAF, its worse if anything. Wont clear codes until it is properly sorted. BTW my friend has just bought this car. Link to comment Share on other sites More sharing options...
Paul Posted January 15, 2006 Report Share Posted January 15, 2006 Sounds like the MAF is had it. Codes will come back if cleared and the problem is still there. Link to comment Share on other sites More sharing options...
Tobes49 Posted January 15, 2006 Report Share Posted January 15, 2006 Your boost is going higher than the ECU limit is the first code, When this happens the car goes into limp home mode untill you switch the ignition off and on again. Just have a look in the VW tech section for lack of power and the maf and VNT/N75 problems are all answered in there! Link to comment Share on other sites More sharing options...
banny Posted January 15, 2006 Author Report Share Posted January 15, 2006 had a look, but cant find out what I am looking for. what to type in search please. Link to comment Share on other sites More sharing options...
Tobes49 Posted January 16, 2006 Report Share Posted January 16, 2006 Remember the default search is set to newer than 1 week! have to change that to a year and a search for N75 left loads of results, But I think this will be the one your looking for click here Link to comment Share on other sites More sharing options...
banny Posted January 28, 2006 Author Report Share Posted January 28, 2006 Well the stealer seems to think the turbo needs changing, reckon he is abit of guesser myself, same man did alot of guessing with the head gasket problem I had on my Passat. My friend took it to someone else, he sais cant be turbo as you would have no pull at all. Had faults cleared and got same fault, this is after changing MAF for a new one. Link to comment Share on other sites More sharing options...
peteA3TDI Posted January 29, 2006 Report Share Posted January 29, 2006 its over boosting try a new N75 as posted (about £40 and far cheaper then a turbo) Link to comment Share on other sites More sharing options...
Mollox Posted January 29, 2006 Report Share Posted January 29, 2006 Tobes, is there more than one fault for overboosting? I used to get "Charge pressure: Upper limit exceeded". What I learnt from that was that even if the car told you it was overboosting, that doesn't necessarily mean it was Turned out I had a holed hose and it couldn't measure boost properly Link to comment Share on other sites More sharing options...
Tobes49 Posted January 29, 2006 Report Share Posted January 29, 2006 Charge pressure: Upper limit exceeded thats when the ECU reads it gone above the boost limit. Charge pressure: postive devation that when the boost is too high for a set point in the rev range. For example in the midrange it looking for 8psi (the cars limit is 15psi) but it reading 13psi, the boost is to high for that point in the rev range but not exceeded the boost limit. Thats postive devation and you can also have negative devation. Link to comment Share on other sites More sharing options...
Tobes49 Posted January 29, 2006 Report Share Posted January 29, 2006 [ QUOTE ] What I learnt from that was that even if the car told you it was overboosting, that doesn't necessarily mean it was Turned out I had a holed hose and it couldn't measure boost properly [/ QUOTE ] Thst should log a negative deavtion fault code, Cause it looking for a set boost and not getting it. Link to comment Share on other sites More sharing options...
banny Posted January 31, 2006 Author Report Share Posted January 31, 2006 Well have changed the N75 and N18 valves over this is from advice from the rep of upsolute, this made no difference3 at all. So that gets rid of that one. What is this VNT and how do I get to it, to see if it is sticking. Link to comment Share on other sites More sharing options...
banny Posted January 31, 2006 Author Report Share Posted January 31, 2006 Found VNT and it is well jammed so gonna see if it can be freed up at all. Link to comment Share on other sites More sharing options...
banny Posted February 1, 2006 Author Report Share Posted February 1, 2006 Well had the springs done by VW last night and took a look at VNT and it is well jammed. The mechanic sais even if you un jam it, the problem is it will come back again. You need a new turbo and that is that. What do you people think of his explanation, is it new turbo or persevere to unjam it. Link to comment Share on other sites More sharing options...
Tobes49 Posted February 1, 2006 Report Share Posted February 1, 2006 What have you got to loose if you unjam it? I've unjamed loads and most dont need a new turbo, So just have a go Link to comment Share on other sites More sharing options...
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