K22SUP Posted May 3, 2017 Share Posted May 3, 2017 Hi guys I have been having an issue with idle dropping down and stalling now and then I find when the car is cold in the morning it runs really low idle and rough then it's ok but after a drive again idle is all over the place car it s tt auto running hks 264 cams and pulleys also walbro fuel pump front mount intercooler double decat and mines ecu I don't have an afr at moment I do have an egt gauge temp has been well but I have a feeling due to Smell on idle and tick over she is running rich I checked voltage on pin ox1 and ground to battery and I got 0.93 volts this stayed. The sane while idling as far as I read this is too high can anyone advise it could this be mines ecu or anything else to check I have had idle control valve off and cleaned it all and checked hoses can't see anything any ideas I have an afr guage on route but I don't know if it is issue with the car Ran fine until was in garage battery went flat only other thing that happened was oil temp sensor for greddy guage showing way too warm and fluctuating massively but car was not warm as was at 130 within 5 minutes sensor was playing up seems to have settled down now thanks Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 4, 2017 Share Posted May 4, 2017 If the O2 voltage is not fluctuating once fully warm then the sensor is fooked, O2 feedback is not used during warm up. Link to comment Share on other sites More sharing options...
K22SUP Posted May 4, 2017 Author Share Posted May 4, 2017 Thanks mate doesnt seem to be moving car was warm and sensor sat at same voltage constantly during idle Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 5, 2017 Share Posted May 5, 2017 Time to replace then. Link to comment Share on other sites More sharing options...
K22SUP Posted May 6, 2017 Author Share Posted May 6, 2017 yes I think so all need to recheck am checking it correctly all need check the process again as well Link to comment Share on other sites More sharing options...
K22SUP Posted May 6, 2017 Author Share Posted May 6, 2017 Glad to say I have found the issue vacuum pipe to aftermarket fuel pressure reg holed Link to comment Share on other sites More sharing options...
K22SUP Posted May 6, 2017 Author Share Posted May 6, 2017 Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 6, 2017 Share Posted May 6, 2017 O2 sensor voltage should still fluctuate, even with compensation for vacuum leak. Link to comment Share on other sites More sharing options...
K22SUP Posted May 6, 2017 Author Share Posted May 6, 2017 I will recheck this but idle is now perfect but if fpr hose is burst car will rob rich which would cause sensor to read really high is that not the case Link to comment Share on other sites More sharing options...
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