Keyan
10-01-2013, 02:31 PM
My car has been developing this issue recently. And it has been getting progressively worse as the weeks wear on.
Cold start up, when attempting to drive the vehicle, it will sputter and cough and not produce any power. 5% throttle or WOT makes no difference.. At exactly 3,000rpms POOF the issue is gone and the car accelerates like it should!
It used to be a slight miss under 3,000 but it is at the point now where throttle input does nothing until that magical 3,000rpm mark where it clears up. Almost like an on/off switch. Can barely accelerate and the Wideband shows super lean (AKA lean misfires) After about a minute of doing it the car will be fine and not do it any more at any rpm.
It also does it some times during warm starts but won't do it for as long (maybe only once)
I am very sure it is electronics related due to it magically clearing up above 3,000rpm. but I can't figure out what it could be.
It's not the TPS (tested ok, but swapped it out anyway. problem persists)
It's not the ECS ECU. (unplugged it, problem persists)
Coils ohm fine and do not arc with water test.
Plugs new.
Wires new.
I have an HKS DLI and the problem persists with it both pluged in and unplugged.
The computer also likes to throw a constant P0300. If I clear it, it will come back in 2 drive cycles, even when this problem I am posting about doesn't happen. I am running aftermarket o2 sensors, which according to a thread on 3SI will cause the p0300, so I considering replacing them with OEM new.
Nothing really looks wrong in my logs (ie, coolant sensor and such seem ok) but I can provide that if I am needed to.
What should I look at next? Replace the o2 sensors? Or maybe the PTU?
Cold start up, when attempting to drive the vehicle, it will sputter and cough and not produce any power. 5% throttle or WOT makes no difference.. At exactly 3,000rpms POOF the issue is gone and the car accelerates like it should!
It used to be a slight miss under 3,000 but it is at the point now where throttle input does nothing until that magical 3,000rpm mark where it clears up. Almost like an on/off switch. Can barely accelerate and the Wideband shows super lean (AKA lean misfires) After about a minute of doing it the car will be fine and not do it any more at any rpm.
It also does it some times during warm starts but won't do it for as long (maybe only once)
I am very sure it is electronics related due to it magically clearing up above 3,000rpm. but I can't figure out what it could be.
It's not the TPS (tested ok, but swapped it out anyway. problem persists)
It's not the ECS ECU. (unplugged it, problem persists)
Coils ohm fine and do not arc with water test.
Plugs new.
Wires new.
I have an HKS DLI and the problem persists with it both pluged in and unplugged.
The computer also likes to throw a constant P0300. If I clear it, it will come back in 2 drive cycles, even when this problem I am posting about doesn't happen. I am running aftermarket o2 sensors, which according to a thread on 3SI will cause the p0300, so I considering replacing them with OEM new.
Nothing really looks wrong in my logs (ie, coolant sensor and such seem ok) but I can provide that if I am needed to.
What should I look at next? Replace the o2 sensors? Or maybe the PTU?