D15B 3 Stage Vtec rough idle when warm - D-series.org

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Old 10-09-2015, 02:16 AM   #1 (permalink)
msh
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Post D15B 3 Stage Vtec rough idle when warm

Hello folks, Im having some weird issues with my ek lately. Ill start off with some background story.
few weeks back i came home from work (4-5km drive) and parked the car outside my home. An hour later when i tried to crank the engine, it wouldnt start. sounded like as if engine wasn't rotating, it had a monotone starting sound from which i was implying that either there was no fuel/spark or the timing belt was broken.
For the next two three days (I had been trying to crank the car after every 4-5hrs) the car had same cranking sound. On the fourth day the I felt as if when I start to crank my engine, the engine did rotate to some extent so i pressed the throttle and let it crank for 15-20 secs. Surprisingly the car started but it had rough idle which lasted for the next 2-3 mins only. I went to the gas station right away and got a full tank. At that point I noticed that the fuel gauge would show only half full tank. Since then I have been using my car 10-15 kms daily and the fuel gauge is fixed at 1/2- 3/4 level at all times even when the fuel was low.
Now recently the car has stared to idle rough but only when the engine has warmed up. Car feels perfectly fine to drive revs up till redline in S mode. the fuel filter was changed merely 2000kms back, throttle body was serviced 1000kms back, injectors were cleaned 2000kms back.
Now where should I start with troubleshooting. and sorry for wordy english!
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Old 10-09-2015, 04:06 AM   #2 (permalink)
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check and clean all grounds and the battery posts.
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Old 10-09-2015, 04:32 AM   #3 (permalink)
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Have a friend cycle the key on and off a few times. turn key so it lights up gauges but doesnt start car, let it sit there for 3-4 seconds, then key off. repeat 3-4 times.

during this you are either in the back seat or sticking your head under car towards gas tank listening for fuel pump action.


If you hear the pump running, try to start car. if it runs fine for a little bit then starts going rough, you probably have a big leak inside the fuel pressure regulator
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