Hey guys.
I hope this is the right place to post rhis. Im just getting back into diagnostics so please bear with me im a bit rusty.
Im doing some work on a car i have recently brought. These are its details
1997 Toyota Caldina GTT
2.0ltr turbo 3SGTE engine (generation 4engine)
3" exhaust
295000kms
New airfilter
Have new plugs and fuel filter to be put in
everything else stock relating to my query
So it has a backfire at times whilst driving and a cough at idle.
On my solus ultra i noticed a few things at IDLE
1.LT fuel trim constant -20% -trying to remove fuel(rich)
2.ST fuel trim -9% - -14% -teying to remove fuel(rich)
3.TPS 13% fully closed and max 80% fully opened(engine off during test)
4.O2 switching ok .1-.8v
5. From memory the inj pulse was around 1.5 at idle
Ok so its obvios its running rich and my backfire is unburnt fuel reigniting. This is what im trying to sort but am not sure where to go from here.
i know its either too much fuel or not enough air.
i was wondering if my TPS might be confusing the ECU, i would of thought that ot should be reading 0% at closed and 100% at WOT? If someone has info on these engine they could email me for testing it that would be good.
Also i wondered if this larger exhaust is playing some part aswell?
Finally a general question how does if at all turbo boost pressure effect fuel trim. Eg going from a vacuume to a pressure?
i would love your thoughts. Thanks heaps
Mat.
I hope this is the right place to post rhis. Im just getting back into diagnostics so please bear with me im a bit rusty.
Im doing some work on a car i have recently brought. These are its details
1997 Toyota Caldina GTT
2.0ltr turbo 3SGTE engine (generation 4engine)
3" exhaust
295000kms
New airfilter
Have new plugs and fuel filter to be put in
everything else stock relating to my query
So it has a backfire at times whilst driving and a cough at idle.
On my solus ultra i noticed a few things at IDLE
1.LT fuel trim constant -20% -trying to remove fuel(rich)
2.ST fuel trim -9% - -14% -teying to remove fuel(rich)
3.TPS 13% fully closed and max 80% fully opened(engine off during test)
4.O2 switching ok .1-.8v
5. From memory the inj pulse was around 1.5 at idle
Ok so its obvios its running rich and my backfire is unburnt fuel reigniting. This is what im trying to sort but am not sure where to go from here.
i know its either too much fuel or not enough air.
i was wondering if my TPS might be confusing the ECU, i would of thought that ot should be reading 0% at closed and 100% at WOT? If someone has info on these engine they could email me for testing it that would be good.
Also i wondered if this larger exhaust is playing some part aswell?
Finally a general question how does if at all turbo boost pressure effect fuel trim. Eg going from a vacuume to a pressure?
i would love your thoughts. Thanks heaps
Mat.
Comment