Proton Wira 4G93 Jerking Problem

[CharmCheeBye]

Hi bro,

Just to ask, before issue solved...does your engine jerking during idling?

no... only when rev... idling is OK

 

[vr2turbo]

the only things i change is the head n block... engine lantai... others like wiring ecu throtle body manifold ( others than head n block ) all use back the 4g92p item... EXCEPT THE TIMING BELT... NEED TO BUY NEW 1.8 TIMING SET AS 1.6 TIMING BELT WONT SUIT 1.8

Oh! now I read it more clearly, means the whole engine change to 1.8 but using 1.6 harness. This way you engine will still run as a 1.6 system, probably not enough fuel.
Changing to larger displacement best should get half cut and transplant everything....

 

[ftzone]

The only way to know if your current setup have an ideal Air Fuel Ratio is to use a Wideband O2 sensor and measure the AFR. It can be done on-road or on a DYNO.
If slightly leaner.. just add fuel pressure regulator and bump up the pressure a bit.
I think a lot of mechanics these days have a wideband kit ready at their workshop.
For one I have it. I charge RM30-40 for AFR monitoring on-road. Or the more expensive way; a DYNO RUN

 

[CharmCheeBye]

The only way to know if your current setup have an ideal Air Fuel Ratio is to use a Wideband O2 sensor and measure the AFR. It can be done on-road or on a DYNO.
If slightly leaner.. just add fuel pressure regulator and bump up the pressure a bit.
I think a lot of mechanics these days have a wideband kit ready at their workshop.
For one I have it. I charge RM30-40 for AFR monitoring on-road. Or the more expensive way; a DYNO RUN

mind to explain furthermore? kinda interested