Supradk Posted August 22, 2014 Share Posted August 22, 2014 hi Guys done a lot troubleshooting lately because my sup was unstable in idle and low rpm driving. It wont give me any error codes but I find out if I take the ground of the battery it disappears If im driving in heavy rain or misty weather it can start again. I think it could be a some electric or a sensor? any of you tried this or now a bad point that can cause this? my supra is a NA-T manual. Quote Link to comment Share on other sites More sharing options...
Abz Posted August 22, 2014 Share Posted August 22, 2014 How old is your battery? Quote Link to comment Share on other sites More sharing options...
Havard Posted August 22, 2014 Share Posted August 22, 2014 How old is your battery? Or are the terminals full of kack? Quote Link to comment Share on other sites More sharing options...
Supradk Posted August 22, 2014 Author Share Posted August 22, 2014 Or are the terminals full of kack? I don't know but I don't have problems fired it up? terminals looking good I think? no white rust on them Quote Link to comment Share on other sites More sharing options...
mellonman Posted August 23, 2014 Share Posted August 23, 2014 Could be a dodgy earth, follow then and clean them up on the chassis points sometimes they get rusty Quote Link to comment Share on other sites More sharing options...
Supradk Posted August 23, 2014 Author Share Posted August 23, 2014 When it happens my A/F reads 16-17 and the idle is bad. Unplugged the batteri in 10 min and its gone Maybe I should take a look at the ground wire Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 23, 2014 Share Posted August 23, 2014 You need to check resistance of ecu grounds at the ecu plug back to the engine block, and to each sensor's ecu ground pin. You can check battery to engine ground by using a jump lead between battery negative and some solid, clean metal part of the engine. Or measure the DC volatage betwwen battery negative terminal and the a clean bit of engine metal with the engine running. It should be in the low mV range. It's also perhaps conceivable the alternator has a rectifier issue and the output is very noisy. You'd need a `scope to effectively check that out. Quote Link to comment Share on other sites More sharing options...
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