Kaan W Posted January 15, 2013 Share Posted January 15, 2013 (edited) After going for a little drive and after some short bursts of acceleration ive noticed the car decelerating in an irregular motion. I can noticably feel this and see it on the rev gauge as if the cars running out of petrol and can see the needle dipping as its going down. It doesnt do this all the time but if im doing say 40mph then decelerate it starts doing it but I dont know why. I dont know if it could it be a faulty sensor I just havent got a clue. The car is being mapped by Ryan next week so it can be sorted then I guess but its just bugging me why this is happening all of a sudden and if its safe to drive? Thanks. Edited January 16, 2013 by Kaan W (see edit history) Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 15, 2013 Author Share Posted January 15, 2013 I just found this page from google and this is happeng to me also....Oh wait, this is my own thread Anyone?? Quote Link to comment Share on other sites More sharing options...
skippyboyo1 Posted January 15, 2013 Share Posted January 15, 2013 Bloody hell have you never got problems!!! Quote Link to comment Share on other sites More sharing options...
JamieP Posted January 15, 2013 Share Posted January 15, 2013 I just found this page from google and this is happeng to me also....Oh wait, this is my own thread You are a strange one. It won't be the mapping unless its done it from the day it was mapped. Quote Link to comment Share on other sites More sharing options...
skippyboyo1 Posted January 15, 2013 Share Posted January 15, 2013 I just found this page from google and this is happeng to me also....Oh wait, this is my own thread Anyone?? Hahahahahahahahahahahahahahaha Quote Link to comment Share on other sites More sharing options...
Littler Posted January 15, 2013 Share Posted January 15, 2013 You are a strange one. It won't be the mapping unless its done it from the day it was mapped. This Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 15, 2013 Author Share Posted January 15, 2013 Thanks I guess it could be something ecu related as I think after switching off then back on it stopped doing it. It seems to be after hitting the rev limiter when shifting manually I get it and thought it could be some kind of limp mode that needs the engine switching off then on again Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted January 15, 2013 Share Posted January 15, 2013 Terrifying. Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 15, 2013 Author Share Posted January 15, 2013 Terrifying. Elaborate? Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted January 15, 2013 Share Posted January 15, 2013 Elaborate? I think you need to do some serious research before going further Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 15, 2013 Share Posted January 15, 2013 Thanks I guess it could be something ecu related as I think after switching off then back on it stopped doing it. It seems to be after hitting the rev limiter when shifting manually I get it and thought it could be some kind of limp mode that needs the engine switching off then on again If your car has an issue, why are you hitting the rev-limiter? Nurse it and get a clean bill of health first... Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 15, 2013 Author Share Posted January 15, 2013 I think you need to do some serious research before going further Research what? I thought this was the perfect place with the amount of knowledgeable people on here that can maybe help me. Do you know what it could be? If your car has an issue, why are you hitting the rev-limiter? Nurse it and get a clean bill of health first... I didnt think it had an issue but after the second time this has happened I know that it may well be an issue. Quote Link to comment Share on other sites More sharing options...
mellonman Posted January 16, 2013 Share Posted January 16, 2013 Research what? I thought this was the perfect place with the amount of knowledgeable people on here that can maybe help me. Do you know what it could be? I didnt think it had an issue but after the second time this has happened I know that it may well be an issue. i think what they are saying is that you know nothing about the system that is in place in your car! and that most if not all your problems are not actual problems and is your kit just doing what its ment to do to save your engine, IE, you may have been booting it alot intake temps get hot you get det ecu pulls timing , or oil preasure drop as it fins out with heat, it could be many things just let Ryan see what the ecu is logged and sort it out next week mate Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted January 16, 2013 Share Posted January 16, 2013 Research what? I thought this was the perfect place with the amount of knowledgeable people on here that can maybe help me. Do you know what it could be? I find it worrying that you obviously don't know a huge amount, yet are spending a huge amount to build a hugely fast car. Buying and reading this book will help you more than you could ever imagine: http://www.google.co.uk/products/catalog?hl=en&rls=com.microsoft:en-gb:IE-Address&q=street+tuning+book&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm=bv.41018144,d.ZG4&biw=1229&bih=892&wrapid=tlif135833110375310&um=1&ie=UTF-8&cid=17378937359483574409&sa=X&ei=6Hz2UP69C8iGhQeAqIGQDw&ved=0CE4Q8wIwAw Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 16, 2013 Author Share Posted January 16, 2013 I find it worrying that you obviously don't know a huge amount, yet are spending a huge amount to build a hugely fast car. Buying and reading this book will help you more than you could ever imagine: http://www.google.co.uk/products/catalog?hl=en&rls=com.microsoft:en-gb:IE-Address&q=street+tuning+book&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&bvm=bv.41018144,d.ZG4&biw=1229&bih=892&wrapid=tlif135833110375310&um=1&ie=UTF-8&cid=17378937359483574409&sa=X&ei=6Hz2UP69C8iGhQeAqIGQDw&ved=0CE4Q8wIwAw Tbh I dont know nothing about the functions of ECUs and there saftey features or how they work which is why I take the car to a knowledgable person to have the work carried out, however I do have a reasonable idea about basic mechanics and can carry out most tasks to rebuild or change an engine im just useless when it comes to the electrical side of things. I just thought this forum was the perfect place for what may sound like stupid questions, but in all fairness may help for simular problems that may occur with other members in the future. Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 16, 2013 Author Share Posted January 16, 2013 Right so ive just been out again and its still doing it, when accelerating its fine but as soon as I let off or sit at traffic lights just ticking over its slightly reving up and down and not stable like it should be. It seems to have only just started doing this so im a bit confused. Quote Link to comment Share on other sites More sharing options...
Littler Posted January 16, 2013 Share Posted January 16, 2013 idle control valve needs a clean? Just a guess though http://www.mkivsupra.net/vbb/showthread.php?210956-How-To-Clean-Idle-Control-Valve-Cleaning-Aka-ICV-(IAC)&highlight=idle+control+valve+cleaning Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 16, 2013 Author Share Posted January 16, 2013 idle control valve needs a clean? Just a guess though Maybe Would this cause the revs to be un stable whilst moving but not accelerating at around 2-3k rpm also? Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 16, 2013 Share Posted January 16, 2013 Right so ive just been out again and its still doing it, when accelerating its fine but as soon as I let off or sit at traffic lights just ticking over its slightly reving up and down and not stable like it should be. It seems to have only just started doing this so im a bit confused. Alternator on its way out and the voltage varying causing the injector loads to change? Quote Link to comment Share on other sites More sharing options...
Littler Posted January 16, 2013 Share Posted January 16, 2013 Maybe Would this cause the revs to be un stable whilst moving but not accelerating at around 2-3k rpm also? Hmm no sure on that one Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 16, 2013 Author Share Posted January 16, 2013 Could I test this by putting some electricals on to see if it gets worse? Or plugging something on the battery to test charging voltage? Quote Link to comment Share on other sites More sharing options...
johnny g Posted January 16, 2013 Share Posted January 16, 2013 Not great with electrical, but I think battery should be >12v and stable when engine running... I think it's 13.8v. Put a multimeter across both terminals. Quote Link to comment Share on other sites More sharing options...
Kaan W Posted January 16, 2013 Author Share Posted January 16, 2013 Not great with electrical, but I think battery should be >12v and stable when engine running... I think it's 13.8v. Put a multimeter across both terminals. Yeah 13.8 is running voltage so I guess i'll check this out and see whats happening. Is there anything else it could be if the alternator seems to be charging fine? Quote Link to comment Share on other sites More sharing options...
Ian C Posted January 16, 2013 Share Posted January 16, 2013 get a video of it up, then remote diagnosis will be much simpler. Quote Link to comment Share on other sites More sharing options...
welshbuddy Posted January 16, 2013 Share Posted January 16, 2013 faulty bar map sensor? Quote Link to comment Share on other sites More sharing options...
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