BC EJ20G boost and Misfire issues
Posted 14 August 2016 - 5:09 AM
Calling for some outside idea's on this one as both Reuben and I are at our wits end on this issue.
The BC seems to have some electrical issue where it will boost fine, idle smoothly and performs without issue. All of a sudden at random running times you will go to over take someone and it just wont pull, usually with stutter as well when going though the rev range.
Sometimes it has a rough idle and popping from the exhaust. The slow performance and stuttering is usually an issue about 70% of the time you're driving.
The car struggles to do a clean pull though the rev range. As if it's low on power.
Stuttering while doing a pull though the rev range as well in any gear
Rough idle with small misfire
Cold start idle is fine as well as cold starting it's self
Issues at any time during drive
Work we have done to try and fix the issue.
ECU ground's have all been done as well as engine grounds.
New battery installed
4 brand new coil packs installed
All new platinum spark plugs
Brand new fuel pump installed
Brand new fuel pressure regulator installed.
3x different ECU's have been fitted all produce the same symptoms
Main ignition relay changed
New genuine o2 sensor fitted
I have swapped my air flow merer a few times, I'm wondering if I try a again with another one.
Swapped out boost controller, igniter and atmosphere sensor
New knock sensor
ECU has been reset
All wrapped up with a fresh oil change
Video of the idle issue:
So has anyone got any ideas or tricks? Seems to be a real strange issue, but at least I can replicate it. As I said, it is intermittent but will guarantee to pop back on any drive.
We have 3 more things to try. Putting a multi meter on the 5V sensor circuit, replacing the temp sensor and replacing the drop resistor.
Posted 15 August 2016 - 4:06 AM
When I had a coil issue it would miss a little on idle and but mostly would run and drive fine. When it did cut out it would drop the cylinder completely and the whole car would go from boost to juddering/jerking violently. Also popped and back fired when it cut.
p.s drive it to SAS or see if he would be willing to come over and check it out?
Posted 15 August 2016 - 8:55 PM
Turns out that green airflow meter might be bad and I created this miss fire issue by swapping it a year ago. The first problem was fixed by replacing the o2 sensor as we killed a few buy not wiring it properly.
So I with Reuben's green airflow meter as a test unit, it seems to be fine (For now). Looks like I need to order in another airflow meter after all this time.
Funny thing is because I swapped two of these over last year, in my mind it was not the issue!
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