FUEL SAVING modification '86 4Y

Discuss modifications on your 1979 to late 1998 SFA 4x4 Hilux here.
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gasoline
High Range 4WD
High Range 4WD
Posts: 44
Joined: Sat Aug 20, 2011 1:17 pm
Town: cape town
Vehicle: toyota hilux 4x4
Real Name: Nasim

Wed Aug 08, 2018 2:21 pm

You can save fuel by reducing the time the FUEL CUT SOLENOID (FCS) remains in the ON position on the carburetor ....this is basically the IDEL JET!

The NIKKI carburetor on the 1986 HILUX 4Y has a EMISSIONS CONTROL COMPUTER (ECC) that governs the switching ON and OFF of the FUEL CUT SOLINOID (FCS) or IDEL JET mounted on the carburetor

Here's how EMISSIONS CONTROL COMPUTER works in a nutshell

*it is a printed circuit board mounted in the left foot well....it is calibrated to turn OFF the FUEL CUT SOLENOID (FCS) (IDEL JET) only after 2250 RPM

*it will first recieve a signal from the VACUUM SWITCHING VALVE (VSV)

*provided the vacuum is above plus minus 15 inches of mercury

2250 RPM IS VERY HIGH and one will find that the IDEL JET is actually suppyling fuel in more cases than it is not.

if one places a warning light in the FUEL CUT SOLENOID path you can see when it lights when this extra fuel jet is running (FCS)

a simple modification whereby you exclude the EMISSIONS CONTROL COMUTER from overriding the VACUUM SWITCHING VALVE is fairly simple

then you run the FUEL CUT SOLENOID (FCS) solely on the VACUUM SWITCHING VALVE and it works well and gets you to about 8.5km / liter

installing a vacuum gauge is highly recommended to monitor the state of the engines combustion...slight ajustments to accelerator is easily noticed as a rise in vacuum and to a more leaner mixture

thanks for having a read through this
Last edited by gasoline on Thu Aug 09, 2018 7:04 pm, edited 2 times in total.
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pampoen
LR 4WD Full Lockers
LR 4WD Full Lockers
Posts: 564
Joined: Thu Jan 24, 2008 10:31 pm
Town: Gordons Bay
Vehicle: 1997 Toyota Hilux 4x4 DC 22R, OME Suspension
Real Name: Luke

Wed Aug 08, 2018 3:10 pm

Thanks for the share GASOLINE, This stuff is worth its weight in gold for the older bakkie owners.
With each replacement of parts, a car slowly becomes Chinese.
gasoline
High Range 4WD
High Range 4WD
Posts: 44
Joined: Sat Aug 20, 2011 1:17 pm
Town: cape town
Vehicle: toyota hilux 4x4
Real Name: Nasim

Thu Aug 09, 2018 7:05 pm

thanks for having a look at this Poenie
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