aaronmk2 3 Posted October 6, 2009 Report Share Posted October 6, 2009 i took my car for a rolling road day a few months ago once it had been run we see that it was running very lean 2.9 co i was told that it should be at about 4.6 co.im racking my brain to try and solve the problem but i cant think what is causing it to run lean.the cars drives fine but and it rolled out at 177bhp but when i change down gear i hear it pop and make noises through the exaust{not backfire noise}. i also have a new problem when i put my foot down at low revs it stumbles for a split second and then is ok.any help appreciated thanksaaron Link to post Share on other sites
VR6Pete 1,455 Posted October 6, 2009 Report Share Posted October 6, 2009 Have you had it on the VAG-COM yet mate? any errors coming up? What mods have you got engine wise? Link to post Share on other sites
aaronmk2 3 Posted October 6, 2009 Author Report Share Posted October 6, 2009 i converted my mk2 to vr6 and havent yet wired up a vagcom port i will be doing this in the next few weeks hopfully my mods are air filter 6 branch and 2.5 system Link to post Share on other sites
aaronmk2 3 Posted October 7, 2009 Author Report Share Posted October 7, 2009 ive been told that it could be my maf.i took the plugs out today and they are white.what should i check as i havent got it setup for vagcom yet and id like to get the problem sortedCheersAaron Link to post Share on other sites
VR6Pete 1,455 Posted October 7, 2009 Report Share Posted October 7, 2009 It's just guess work until you've plugged it in to VAG-COM, it could be a number of things causing it run lean in all fairness. VAG-COM is the first port of call, use the measuring blocks to monitor air / fuel, check for fault codes Pete Link to post Share on other sites
aaronmk2 3 Posted October 7, 2009 Author Report Share Posted October 7, 2009 fair enough thanks very much for your help il get it on vagcom Link to post Share on other sites
RIX 0 Posted October 7, 2009 Report Share Posted October 7, 2009 on my mates sls 3.0 vr6 we didn´t that it was running lean until we came for final adjustment at sls,we changede for just to be safe the lambda and there was a new sensor in the water,plus put a 400cell kat but it was stil just puting out around 207hp,they found out that the maf was dead they did try to clean it first but didn´t help,a new used one in and it now gives 219hp still abit short but we think that maybe a corrado airbox and a diffrent cat mit get the last hp out,maybe new injectors too.but the new used maf made a huge diff. Link to post Share on other sites
aaronmk2 3 Posted December 23, 2009 Author Report Share Posted December 23, 2009 well i was looking around the engine today after checking fuel pump etc i found my fpr vaccum pipe was hanging out the inlet mani so id imagine that will be were the air leak was coming from would this of caused it to be running lean? Link to post Share on other sites
RIX 0 Posted December 23, 2009 Report Share Posted December 23, 2009 maybe have you gone for a ride, you should feel a difference. Link to post Share on other sites
aaronmk2 3 Posted December 31, 2009 Author Report Share Posted December 31, 2009 i havent taken it out yet as its off the road for some work but i cant wait to take it out im sure il see if this was the problem if not il be pulling my hair out lol Link to post Share on other sites
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