Picoto Posted October 23, 2018 Share Posted October 23, 2018 i have a NA-T Auto which is on about 11psi of boost running the DET3 piggy back. When boosting the car is running strong but once you come off throttle and crusing it is like i am having fuel cut. so when i am driving normally the AFR will go to --- and then go back to about 13 when not boosting. when it goes to --- it like the engines dies and has no fuel then it will just come back on again. Same thing if i am in nutreal and rev the car it will cut fuel at top revs while standing still. Does anyone know what this could be as it is getting abit annoying when you driving down the road normal and it jerks on and off. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted October 23, 2018 Share Posted October 23, 2018 Get the map checked. The -- symbol means no AFR is being sensed on an AEM so I guess its reading OK Quote Link to comment Share on other sites More sharing options...
Dim Sum Posted October 23, 2018 Share Posted October 23, 2018 The -- symbol is it doing that when its reach the rich side or the lean side? If my memory serves me right there be a colour led running above the numbers that will show you before it goes to -- ( if you are running too rich or lean to be measured ) on closed throttle it will sometimes read -- at the lean side and on boost it can go to the -- on the rich side, just want to see if it is a fuel cut or over fueling If you are not booting it it should always have a reading. Quote Link to comment Share on other sites More sharing options...
Picoto Posted October 23, 2018 Author Share Posted October 23, 2018 Yeah it don’t happen when booting it. It normally red side which is lean but it normally just cuts off and then kicks back on. Will try load a video on now Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted October 23, 2018 Share Posted October 23, 2018 If this is an AEM gauge then the -- reading means max lean. Usually from injectors cutting out, I normally see the reading on overrun. First question. Has this piggyback ever worked properly, or is this the first time you are trying it and having this issue, or was it fine and this issue developed randomly? Quote Link to comment Share on other sites More sharing options...
Picoto Posted October 23, 2018 Author Share Posted October 23, 2018 Quote Link to comment Share on other sites More sharing options...
Picoto Posted October 23, 2018 Author Share Posted October 23, 2018 now i am not lifting my foot in them videos that my foot staying still and cruisung Quote Link to comment Share on other sites More sharing options...
Picoto Posted October 23, 2018 Author Share Posted October 23, 2018 yeah it was not so bad when i got it back from maping. maybe did it once in a couple days now it does it when ever i drive it slowly lol Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted October 23, 2018 Share Posted October 23, 2018 I've seen something similar before, it wasn't on a DET 3 piggyback, but maybe problem is the same. There was an NA-T that had a TPS dodgily mounted to a ebay front facing intake. The TPS would rotate very slightly on it's mount which caused the TPS calibration on the ECU to fall out of sync. This meant that when the driver put low throttle on the pedal, the TPS was not actually registering any movement. When the RPM went over a certain level, the ECU would think that the engine was in over run (no throttle, coasting, 0% TPS) and would cut fuel to the injectors. You would drive along and the car would constantly cut out. If you planted it the TPS would register something and over run would not kick in. If you can connect to DET 3 in realtime, maybe check to see what TPS value you are getting. Quote Link to comment Share on other sites More sharing options...
Picoto Posted October 24, 2018 Author Share Posted October 24, 2018 taking it was a throttle body like mine lol. That was something I thought about Quote Link to comment Share on other sites More sharing options...
Picoto Posted October 24, 2018 Author Share Posted October 24, 2018 How did u fix the problem Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted October 24, 2018 Share Posted October 24, 2018 Looks like a similar throttle body yes. In the end I had to make a new mount for TPS to sit on so it wouldn't have any flex/rotation, as well as recalibrating the TPS in the ECU. Whilst connected to DET 3 Where I've highlighted the red, you should be able to see the live reading of your TPS. I would check this first and make sure that the second you touch that throttle you are getting a smooth input here. If the TPS reading is not instant or replicating what you are doing with the throttle, then definitely need to re calibrate. Where I've highlighted in yellow is where you can re calibrate the TPS. Furthermore, if you can't get the TPS sorted for whatever reason then you can try disabling the over run fuel cut by playing with a combo of the following settings: Quote Link to comment Share on other sites More sharing options...
SUPRA9 Posted May 2, 2020 Share Posted May 2, 2020 how do you disable overrun fuel cut/deceleration fuel cut (is overrun fuel cut same as deceleration fuel cut) Det 3 Quote Link to comment Share on other sites More sharing options...
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