davidhodgkinson Posted February 5, 2005 Report Share Posted February 5, 2005 Hi I don't know if I've got a MAF problem, but during acceleration the car sometimes hesitates for a fraction of a second. I've logged in with VAG COM and found the following :-> A) 1 Fault Found: 17608 - Boost Pressure Control Valve (N249): Mechanical Malfunction P1200 - 35-00 - - B) The Max Air Mass Flow monitored was 132.28 g/s with a max RPM of 5600 Does anyone know if I've got a problem with both the MAF and valve n249? Thanks David Car 2001 S3, non modified. Has had a "engine rebuild" about 3 months ago Link to comment Share on other sites More sharing options...
Paul Posted February 5, 2005 Report Share Posted February 5, 2005 clear them see if it comes back. Maf does seem a bit low. id have expected 160's at peak RPM from a standard 225. mine hits 190+ remapped. With occasional 200 g/sec N249 is under the engine cover over cylinders 3&4. check its plugged in, its not uncommon for it to be left unplugged after works been carried out on the coil packs/spark plugs etc. Link to comment Share on other sites More sharing options...
Paul Posted February 5, 2005 Report Share Posted February 5, 2005 thinking about this, mechanical function doesnt lend itself to a electrical fault with it being unplugged. Then again, it wont mechanically work if unplugged, so possible. N249 is to do with Diverter valve control, so you may also want to check that, If you google N249 some people with aftermarket DV's have had this code when using too strong a spring. I guess a dodgy sticking or torn OEM DV could give similar results and would affect performance. Link to comment Share on other sites More sharing options...
Paul Posted February 5, 2005 Report Share Posted February 5, 2005 This shows the N249 valve ontop of the engine and the electrical plug. It also shows a possible source of a boost leak. This shows abit about Maf logging and expected results. Thanks to my mate Wak for the links above. Link to comment Share on other sites More sharing options...
davidhodgkinson Posted February 6, 2005 Author Report Share Posted February 6, 2005 Thanks Paul, I'll have a look at the valve. I've cleared the error code, but within 4 miles it returns. The valve is the oem version. Happy Birthday !!! Link to comment Share on other sites More sharing options...
Paul Posted February 6, 2005 Report Share Posted February 6, 2005 Cheers mate. DV's are cheap enough to replace, if you want to elimintate it. As yours is an early S3. you may well benifit from the later Bosch 710N version as the previous incarnations were not very reliable. They are only £15 from www.vagparts.com Link to comment Share on other sites More sharing options...
davidhodgkinson Posted February 6, 2005 Author Report Share Posted February 6, 2005 I think I've found the fault. There was a large split hose under the engine cover. I'll log the ECU later to see if it has adjusted the Air Mass Flow Link to comment Share on other sites More sharing options...
Paul Posted February 6, 2005 Report Share Posted February 6, 2005 Thats the main boost/vac supply line from the manifold. Link to comment Share on other sites More sharing options...
davidhodgkinson Posted February 6, 2005 Author Report Share Posted February 6, 2005 I've been out and logged the ecu data. I'm now getting 174.06 on the Air mass flow and no error code, yet! Let's hope this has cured the problem :-) Link to comment Share on other sites More sharing options...
Paul Posted February 6, 2005 Report Share Posted February 6, 2005 excellent. you should have your performance back too. Link to comment Share on other sites More sharing options...
Drillslinger Posted February 7, 2005 Report Share Posted February 7, 2005 Where's the N249 on the A3?? The symptoms sound similar to what's wrong with my TQ, but I don't have that valve on top of the engine Link to comment Share on other sites More sharing options...
Paul Posted February 7, 2005 Report Share Posted February 7, 2005 Sorry drill havent a clue for the A3. only suggestion is follow the DV vac line back to find it.. Link to comment Share on other sites More sharing options...
Drillslinger Posted February 7, 2005 Report Share Posted February 7, 2005 Thanks dude That's enough for me to find it Link to comment Share on other sites More sharing options...
Drillslinger Posted February 8, 2005 Report Share Posted February 8, 2005 Hmm I took a look, and the vacuum line on my DV drops to a hard hose, then down into a big mess of hoses, etc Where does the line come off the manifold? Maybe I can track it forward from there Link to comment Share on other sites More sharing options...
Paul Posted February 8, 2005 Report Share Posted February 8, 2005 hmmm mine comes off either the under side of the manifold or the pipes on the far left, but your intake is the other way around to mine and laid out differently. roll your sleeves, up get a torch and get in there looking. Link to comment Share on other sites More sharing options...
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