R33-RB26DETT Posted February 8, 2009 Share Posted February 8, 2009 Hi, I need to pass emissions testing therefore I have brought my car back to completely stock. The history is that I took my car in to the mechanic to fix the below and bring my car back to stock: -Install stock airbox -Install stock exhaust -Install stock cat. -Replace 1 faulty 02 Sensor -Replace 6 leaking injectors Now that all of this has been completed my car is idling like crap, and is missing when driving under very light throttle the car hesitates/chokes from about 2,000 RPM up until 3,500 RPM. Although if I drive with heavy throttle the car drives and revs normally. My mechanic advised me to replace my spark plugs as they are most likely fouled as since they needed to start/stop the car heaps of times whilst repairing it.. So I replaced them with (0.8 Gapped plugs) as recommended by him. I did this, but the problem remains exactly the same. What could the issue be? Maybe I need to run the recommended stock gap of 1.1? Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/ Share on other sites More sharing options...
TAKUSHI Posted February 8, 2009 Share Posted February 8, 2009 mmm sounds like its doing what my car does but does your prob go away once the engines warm? Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415191 Share on other sites More sharing options...
R33-RB26DETT Posted February 8, 2009 Author Share Posted February 8, 2009 Nope, stays there even after it is warm. Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415241 Share on other sites More sharing options...
geraus Posted February 8, 2009 Share Posted February 8, 2009 Have you tried resseting your ecu? Are you also using stock coil packs? also try cleaning your AAC valve. Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415298 Share on other sites More sharing options...
MR R33 GTS-T Posted February 8, 2009 Share Posted February 8, 2009 Are you using the stock bov? i had similar issue put stock bov back on and it was fine Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415322 Share on other sites More sharing options...
joeleo87 Posted February 8, 2009 Share Posted February 8, 2009 are u using stk turbos? or aftermarket? aftermarket turbos with stk ecu can cause problems Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415324 Share on other sites More sharing options...
murrayis Posted February 8, 2009 Share Posted February 8, 2009 Tried changing the spark plugs? Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415469 Share on other sites More sharing options...
R33-RB26DETT Posted February 9, 2009 Author Share Posted February 9, 2009 Are you using the stock bov? i had similar issue put stock bov back on and it was fine Yep, Stock BOV. Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415710 Share on other sites More sharing options...
R33-RB26DETT Posted February 9, 2009 Author Share Posted February 9, 2009 are u using stk turbos? or aftermarket?aftermarket turbos with stk ecu can cause problems Stock ECU, Stock Turbos - everything stock now to pass EPA. Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415719 Share on other sites More sharing options...
R33-RB26DETT Posted February 9, 2009 Author Share Posted February 9, 2009 Tried changing the spark plugs? Yes, I have changed the spark plugs as I suspected that maybe the previous ones had fouled. I pulled them out and they were very black becuase my car was running very rich prior to fixing my 02 Sensor. New sparkplugs have gone in with (0.8) Gap and the problem is identical. Perhaps i should only have them gapped to (1.1) even though my mechanic says not too? Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415722 Share on other sites More sharing options...
R33-RB26DETT Posted February 9, 2009 Author Share Posted February 9, 2009 Have you tried resseting your ecu? Are you also using stock coil packs? also try cleaning your AAC valve. It may be my ACC Valve needs cleaning, I just found a thread on SAU about this, and I will give it a go. Other than that I have no idea what it could be. Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4415726 Share on other sites More sharing options...
R.3.2.G.T.R Posted February 9, 2009 Share Posted February 9, 2009 checked afm - plugs/dry solder joint.. maybe not related.. there's a thread on that as well Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4416477 Share on other sites More sharing options...
R33-RB26DETT Posted February 9, 2009 Author Share Posted February 9, 2009 Taking it in to the mechanic tommorow to diagnose the issue. Will let you know what it was. Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4416614 Share on other sites More sharing options...
peter_fc Posted February 9, 2009 Share Posted February 9, 2009 May have a vacuum leak? Is it missing in one particular cylinder or just idling rough? Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4416735 Share on other sites More sharing options...
Wacky Dee Posted February 9, 2009 Share Posted February 9, 2009 try regapping plugs to 0.9 or 1.0 .. My car was constantly misfiring on idle/low load when new plugs the mechanic put in were gapped at 0.7 Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4417261 Share on other sites More sharing options...
R33-RB26DETT Posted February 12, 2009 Author Share Posted February 12, 2009 They just put it on the dyno and found out its the other 02 sensor. Link to comment https://www.sau.com.au/forums/topic/256128-car-missing-under-light-throttle-and-on-idle/#findComment-4422667 Share on other sites More sharing options...
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