Stonkin Posted October 31, 2008 Share Posted October 31, 2008 (edited) Hi, I have a slight issue with my idle which i would like some advise on please. This problem only happens if the car has been used and it is turned off for a few minutes and then started again, ie at a petrol station filling up. Tonight i drove about 12 miles,it was started from cold and drove with no issues. I stopped at a shell for fuel, when i started it to drive off the revs were bouncing between 400ish and just over 1k, when it does this the lights on the dash go dim as the revs are too low. You can also feel the car rock/vibrate when it happens. It is an auto and pulling out of the station was slightly difficult as each time the revs drop and rise the car is lurching forward a bit. When it is being driven it cant really be noticed but when it does this it will normally take a mile or so for it to stop. From the garage i drove home which was just round the corner,pulled up and recorded this video to show revs and afr gauge. I spent 20 mins at home, went out in the car again and it was fine. This isnt the first time this has happened. Any ideas? The car is a T61 single auto with an emanage ultimate mapped by Ian C. Edited November 1, 2008 by Stonkin (see edit history) Quote Link to comment Share on other sites More sharing options...
supra matt Posted October 31, 2008 Share Posted October 31, 2008 have you got a laptop mate? if so data log it and post it up also have a look at the emanage to see if it's showing a fault light ? could be a loose connection between the emu and ecu. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted October 31, 2008 Author Share Posted October 31, 2008 Hi Matt, yes i do have a laptop. There is a usb and serial cable which are easy to get to. I think from memory Charlie said the usb was the emanage? Do i need any software on my laptop to get a data log? Quote Link to comment Share on other sites More sharing options...
supra matt Posted November 1, 2008 Share Posted November 1, 2008 hi mate yes need the software disk that comes with the emanage . might be worth pm ing Ian c if his the one that mapped it . Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted November 1, 2008 Share Posted November 1, 2008 If that is a wideband gauge in the left of you're video, then its reading way to lean, which could be an indication of you're problem. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 1, 2008 Author Share Posted November 1, 2008 Yes it is mate. When it does this it seems to idle around the late 19 to 20 mark. Other times it sits around 14 or 15 Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted November 1, 2008 Share Posted November 1, 2008 Yes it is mate. When it does this it seems to idle around the late 19 to 20 mark. Other times it sits around 14 or 15 That i suspect is you're problem, when does it do this, hot or cold, and does it do it when the rpm is higher? Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 1, 2008 Author Share Posted November 1, 2008 Its only ever done it hen the car has been used, switched off only for a few mins and then started again. If its started from cold its fine. If its in drive and being driven its ok, but not as smooth, if your at low speed and not on the accelerator you can notice it. But after a few miles it seems to go back to normal Quote Link to comment Share on other sites More sharing options...
adnanshah247 Posted November 1, 2008 Share Posted November 1, 2008 im having the same problem Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted November 1, 2008 Share Posted November 1, 2008 Its only ever done it hen the car has been used, switched off only for a few mins and then started again. If its started from cold its fine. If its in drive and being driven its ok, but not as smooth, if your at low speed and not on the accelerator you can notice it. But after a few miles it seems to go back to normal Trying to think of possible causes, so bare with me as I'm thinking aloud, i would suspect the ECU temp sensor, but as the AFRs are weak, instead of rich which is the default should it fail, same goes for air temp and lambda, the only other thing may be the EMU settings, as now the ambient temps have dropped it could be this causing the problem, are you sure you haven got a vacuum hose come off? Quote Link to comment Share on other sites More sharing options...
b_have Posted November 1, 2008 Share Posted November 1, 2008 Hmm, strange one C, it only happens when hot and re-started? Needs a datalog to see whats happening. The purple Serial/USB lead is the EMU link, I have the software on my laptop here but no disk . Might be worth letting Ryan have a look and tweek it. Quote Link to comment Share on other sites More sharing options...
Ian C Posted November 1, 2008 Share Posted November 1, 2008 I hate to say this, but try resetting the ECU Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 1, 2008 Author Share Posted November 1, 2008 Thanks guys. How do i reset the ecu, disconnect the battery as normal for 5 mins? I presume this wont remove any of the map? Stupid question, but would rather ask than not. Surely maps do not have to be adjusted when the ambient air temp drops? Quote Link to comment Share on other sites More sharing options...
Homer Posted November 1, 2008 Share Posted November 1, 2008 Thanks guys. How do i reset the ecu, disconnect the battery as normal for 5 mins? I presume this wont remove any of the map? Stupid question, but would rather ask than not. Surely maps do not have to be adjusted when the ambient air temp drops? Yes, just remove the battery connector or the ECU main fuse (personally I've always just disconnected the battery). The map on the EMU won't go anywhere. The map does need to be adjusted to correct for intake air tempurature, but this should be part of the map already on the ECU. It's a bit of an odd one, but agree with the points Ricky made earlier. Quote Link to comment Share on other sites More sharing options...
Ian C Posted November 1, 2008 Share Posted November 1, 2008 I say the above because last year mine started getting leaner and leaner in closed loop until it was running at 17:1 AFRs on idle and sounding rather rough. I was stumped as closed loop is mostly unaffected by the E-Manage. So I reset the ECU to start with, and it's been fine ever since. As "reset the ECU" used to be the cry of the desperate and ignorant a while back I was reluctant to believe it fixed the problem, but after over a year it's been fine Hopefully it'll work for you as well. -Ian Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 2, 2008 Author Share Posted November 2, 2008 Ive got a few places to go today, and was going to take the supra so i could note down a few more accurate numbers from the afr to see if it would help. But i think i will reset the ecu before i go, then i'll post up some numbers later to see if its behaving a bit more normal. Appreciate your help. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 2, 2008 Author Share Posted November 2, 2008 Hi guys, right, i left the battery disconnected for about an hour this morning and then went out in the car. I noted down some of the results but things dont seem any better. First start up after reset - started at 13 and slowly rose to about 15.2 I drove aboout 2 miles and then had to stop at first shop. It was left for about 20 mins, when started the idle was between 21 and 23 After 1 minute of slow driving this dropped to 14.7 to 15 At 60 mph, 3k revs in 3rd it showed 13.7 Whilst in 3rd i did a 3/4 throttle run at 1.0 bar and it was 10.5 At WOT in 3rd at 1.4 bar it showed 9.5 Parked up at Tesco and at idle it was 19.6 1 hour later at startup it was idling at 22 - 24 I pulled up at a set of lights on way home and noticed if i was in neutral it showed 18.1, whilst in drive it showed 15 At general cruising it was always around 14-15, but soem of the results above worry me. Anyone have any ideas? I think a checkup from Ryan would definetly be worthwhile. Quote Link to comment Share on other sites More sharing options...
supra matt Posted November 2, 2008 Share Posted November 2, 2008 Hi mate that seams to be well over fueling at wot should be about 10.7 safe to 11.5 for a bit more power . and then way to lean at the other end of the scale ! need to see a data log really to get an idea of whats what . But as you don't have the software Ryan would be your next best thing , I would not do to many wot pulls with it been that rich. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 2, 2008 Author Share Posted November 2, 2008 Thanks Matt. Where can i get the EMU software from so i can post up a bit more information, if its something i need to pay for then fine, would just be very useful to have. Quote Link to comment Share on other sites More sharing options...
Homer Posted November 2, 2008 Share Posted November 2, 2008 Thanks Matt. Where can i get the EMU software from so i can post up a bit more information, if its something i need to pay for then fine, would just be very useful to have. Have a look here: http://www.mohdparts.com/emanage/ I *think* you can use just a normal USB cable to connect Quote Link to comment Share on other sites More sharing options...
Nic Posted November 2, 2008 Share Posted November 2, 2008 I *think* you can use just a normal USB cable to connect Yes you can with the EMU. Quote Link to comment Share on other sites More sharing options...
Golfpro Posted November 2, 2008 Share Posted November 2, 2008 Are you running the stock airbox or aftermarket filter? If you have removed the standard filter box your problem could be heatsoak from the engine. My car had exactly the same symptoms after I went single. I made a cold air box around the filter and now it is perfect. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 2, 2008 Author Share Posted November 2, 2008 Thanks Homer, just taking a look there now. Charlie left a usb cable already connected tucked just under the centre console Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 2, 2008 Author Share Posted November 2, 2008 Golfpro, its running an aftermarket induction kit and there are no heat shields. Quote Link to comment Share on other sites More sharing options...
Stonkin Posted November 2, 2008 Author Share Posted November 2, 2008 Do i just download the latest FULL version 2.16, and do i then need to also install the latest update 2.20 or is this not necassary? Quote Link to comment Share on other sites More sharing options...
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