Goobie2012
New Member
- Joined
- Jun 22, 2021
- Messages
- 4
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- Age
- 52
- Location
- Australia
- Members Ride
- Commodore SV6 2011
Hi all,
Need some advice regarding issue recently experienced, I am not mechanically or electronically minded, I had access to a OBD2 mobile app and tool ( lite version of software only shows 7 most current codes at the time ) and I understand the actual symptoms but not what may be the overall cause.
Car was running as normal, turned right at a set of lights, felt a little shutter lasting maybe 2 seconds, then alarms starting going off constantly, white smoke pouring from exhaust ( rich fuel smell ), car immediately lost power with dash saying (power save on or something ), foot flat the floor produced about 15km per hr and car was a earthquake, stank of fuel. I made it to the destination 5 mins away 3 sets of red lights. Parked car, after 3 hours came back to parked car, tried to start, seems to hesitate starting, after a few tries, it turned over, alarms started again, car still shaking, unburnt fuel coming out of exhaust. Thats when I had a chance to scan OBD2 results below ( remember only top 7 were available on trial version of mobile software )
- P0300
- P0302
- P0304
- P0306
All these are misfires from either cyclinder 2 - 4 - 6
- P087 Fuelrail pressure low
- P089 Fuel pressure regulator performance
- P0154 Heated O2 Sensor ( Bank 2 ) No activity
So the misfires are cylinders not sparking or igniting fuel as normally expected
The next group is possible low fuel pressure due to failing regulator causing low pressure alarm in fuelrail
the last 1 is the oxygen sensor bank 2 no triggering as normal expected.
My question is, the misfires are all on the same side, I assume bank 2 , so could this mean cylinders 2 4 6 didnt fire causing no activity alarm for HO2S bank 2 but injectors still pumped fuel into engine causing a flooding situation, going from 6 cylinders to only 3, all on the same side
What i dont get is the low pressure fuel rail and fuel regulator performance ? what would be happening, if all these are triggered, low pressure fuel rail for instance shouldnt create a plume of unburnt fuel through the exhaust. Could this be a fault with the ECU or maybe the injectors for 2 4 6 are locked in open circuit or jammed/stuck
Car was towed to a mechanic, 24hrs after it all began, car was still exhibiting the same behavior, they did some tests etc, cleared codes and sent it to auto electrician. Unfortunately, after 4 or 5 days more sitting still ( I guess airing out ) and with no available fault codes to work with, electrician started car and it seems to be running fine now.
I am at a loss, but I dont want to take car home only for same thing to happen in a week and I am up for another towing fee, service charge etc.
Any suggestions would be helpful, recent repair history is 7 months ago timing chain replaced, 180,000km , 3 months ago had issue with P0304 cylinder 4 misfiring, mechanic swapped coil lead 4 with another coil lead to see if problem resurfaced on the new location, fuel filter replaced with brand new OEM filter and kit.
Yes P0304 history is there, now the entire side exhibiting same issue. I am guessing new coils maybe, I dont know, the other alarms may point to something else. I am hoping its not the ECU ( costly repair for sure )
I await anyones assistance, this is above my mechanically and electrical skills.
Need some advice regarding issue recently experienced, I am not mechanically or electronically minded, I had access to a OBD2 mobile app and tool ( lite version of software only shows 7 most current codes at the time ) and I understand the actual symptoms but not what may be the overall cause.
Car was running as normal, turned right at a set of lights, felt a little shutter lasting maybe 2 seconds, then alarms starting going off constantly, white smoke pouring from exhaust ( rich fuel smell ), car immediately lost power with dash saying (power save on or something ), foot flat the floor produced about 15km per hr and car was a earthquake, stank of fuel. I made it to the destination 5 mins away 3 sets of red lights. Parked car, after 3 hours came back to parked car, tried to start, seems to hesitate starting, after a few tries, it turned over, alarms started again, car still shaking, unburnt fuel coming out of exhaust. Thats when I had a chance to scan OBD2 results below ( remember only top 7 were available on trial version of mobile software )
- P0300
- P0302
- P0304
- P0306
All these are misfires from either cyclinder 2 - 4 - 6
- P087 Fuelrail pressure low
- P089 Fuel pressure regulator performance
- P0154 Heated O2 Sensor ( Bank 2 ) No activity
So the misfires are cylinders not sparking or igniting fuel as normally expected
The next group is possible low fuel pressure due to failing regulator causing low pressure alarm in fuelrail
the last 1 is the oxygen sensor bank 2 no triggering as normal expected.
My question is, the misfires are all on the same side, I assume bank 2 , so could this mean cylinders 2 4 6 didnt fire causing no activity alarm for HO2S bank 2 but injectors still pumped fuel into engine causing a flooding situation, going from 6 cylinders to only 3, all on the same side
What i dont get is the low pressure fuel rail and fuel regulator performance ? what would be happening, if all these are triggered, low pressure fuel rail for instance shouldnt create a plume of unburnt fuel through the exhaust. Could this be a fault with the ECU or maybe the injectors for 2 4 6 are locked in open circuit or jammed/stuck
Car was towed to a mechanic, 24hrs after it all began, car was still exhibiting the same behavior, they did some tests etc, cleared codes and sent it to auto electrician. Unfortunately, after 4 or 5 days more sitting still ( I guess airing out ) and with no available fault codes to work with, electrician started car and it seems to be running fine now.
I am at a loss, but I dont want to take car home only for same thing to happen in a week and I am up for another towing fee, service charge etc.
Any suggestions would be helpful, recent repair history is 7 months ago timing chain replaced, 180,000km , 3 months ago had issue with P0304 cylinder 4 misfiring, mechanic swapped coil lead 4 with another coil lead to see if problem resurfaced on the new location, fuel filter replaced with brand new OEM filter and kit.
Yes P0304 history is there, now the entire side exhibiting same issue. I am guessing new coils maybe, I dont know, the other alarms may point to something else. I am hoping its not the ECU ( costly repair for sure )
I await anyones assistance, this is above my mechanically and electrical skills.
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