really bad fuel consumption

[JDD218]

i'm driving an ad resort 1.6 carburator engine,auto trasnmision.the problem is having a bad Fuel consumption, the engine jerks when flooring the accelerator,like not enough fire power, imagine traveling from melaka to jb and back again cost me rm120 of petrol.. the things i've repaired and changed are:
1)alternator 2 pcs still the same
2)battery
3)distributor 2 pcs still no improvement
4)plug cable NGK 2 sets still the same
5)spark plug iridium
6)carburator
7)fuel filter
8)petrol pump

*when turning the alternator fully advance,no knocking sound..??
*some say there maybe a wiring problem, so if any sifu's here can help i really apreciate..thank you in advance..

 

[addyloo]

Hi, I am driving a carburettor Nissan also.
You have replace all the electrical item but problem still same ?

1st need to identify, when you flooring the accelerator, the engine is jerking. This jerking means misfire or knocking?

Has you replace fuel filter? It may be stuck and cause the fuel flow rate reduce.
Have you check the earth cable, which from engine body to vehicle body ground ? remove the screw and use sand paper to vanish the body, so that it have a good grounding.


*when turning the alternator fully advance,no knocking sound..?? => is it turning the distributor fully advance?
If after turning full advance still no knocking sound, it could be cylinder pressure not enough.

 

[peterlm]

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