Guest jonte_j Posted June 22, 2010 Share Posted June 22, 2010 How comon is it for the mapsensor to break down? Got problems with too much fuel when not using the turbos! Could changing the mapsensor be the solution? Thinking that it must be either this or the fuel pressure regulator. Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted June 23, 2010 Share Posted June 23, 2010 Have you tried doing a diagnostic check on the car? http://www.mkivsupra.net/vbb/showthread.php?t=35920 I'm sure some of the lads have had this problem in the past but I think they will need more information about the symptoms you have. Quote Link to comment Share on other sites More sharing options...
Guest jonte_j Posted June 23, 2010 Share Posted June 23, 2010 Yes ive tried it but it shows nothing, not a single wrongcode Quote Link to comment Share on other sites More sharing options...
CanisLupus Posted June 23, 2010 Share Posted June 23, 2010 Got a similar thing. With the exception that mine won't start sometimes with the Sensor connected when it's warm... No codes stored.... Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted June 23, 2010 Share Posted June 23, 2010 (edited) If its a problem off-boost there may be a chance its the O2 sensor(s). You really need to get someone better than me to get involved but I'm nearly sure that the sensors only play a part in the fuelling at tick-over and low revs and then the system goes into some kind of open loop for the rest of it. But seriously mate I could be a million miles off the mark as I don't even have a turbo! Someone is bound to come along and have some real advice for you. Edited June 23, 2010 by pedrosixfour whatchutalkinboutwill? (see edit history) Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted June 23, 2010 Share Posted June 23, 2010 Re 02 sensors, they only come into play on part throttle, closed throttle=closed loop, open throttle=open loop. I think. How do you know youve got too much fuel, AFRs low? Quote Link to comment Share on other sites More sharing options...
TLicense Posted June 23, 2010 Share Posted June 23, 2010 It's only at WOT that the ECU goes open loop and ignores the O2 sensor. Quote Link to comment Share on other sites More sharing options...
spidermonkey Posted June 23, 2010 Share Posted June 23, 2010 Could have a small boost leak? (I know you said off boost) I had a small crack in one of my boost pipes going to my boost gauge and the car over fuelled like mad and gradually got so bad that I had error 34 manifest itself Quote Link to comment Share on other sites More sharing options...
Guest jonte_j Posted June 23, 2010 Share Posted June 23, 2010 Re 02 sensors, they only come into play on part throttle, closed throttle=closed loop, open throttle=open loop. I think. How do you know youve got too much fuel, AFRs low? When problem appears there is massive black smoke comin out at the back! Wideband messurements shows too much fuel! Quote Link to comment Share on other sites More sharing options...
Guest jonte_j Posted June 23, 2010 Share Posted June 23, 2010 Could have a small boost leak? (I know you said off boost) I had a small crack in one of my boost pipes going to my boost gauge and the car over fuelled like mad and gradually got so bad that I had error 34 manifest itself I´ll have to check this! Tnx Quote Link to comment Share on other sites More sharing options...
Ian C Posted June 23, 2010 Share Posted June 23, 2010 It's only at WOT that the ECU goes open loop and ignores the O2 sensor. Mmm, it also responds to rapid throttle delta's not, necessarily just WOT. So jabbing it halfway down quickly will knock it out of closed loop. It also comes out above 4000rpm anyway, so cruising at 105mph is much more fuel efficient than 115mph Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted June 23, 2010 Share Posted June 23, 2010 Are you running bigger injectors or something? Quote Link to comment Share on other sites More sharing options...
Guest jonte_j Posted June 24, 2010 Share Posted June 24, 2010 Nope, not that i know of! Uprated pump from walbro is the only fuel mod i have on the car! Im running BPU Quote Link to comment Share on other sites More sharing options...
Guest jonte_j Posted June 24, 2010 Share Posted June 24, 2010 My theory for the moment is the fuel pressure regulator! If thats faulty it can´t send the fuel back to the tank, and so it stay in the fuelrail and gets pressed in to the cylinder!? I might be way of here! Quote Link to comment Share on other sites More sharing options...
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