New mk3 trying to learn a bit

cre · 08-05-2011, 08:46 PM

In your last photos:

1) Fuel resistor pack relay connector. This is normally run to a relay which switches the fuel pump power to a resistor pack to help lower fuel pressure at low loads. It's commonly deleted with aftermarket pumps although this requisite has been largely disproved.

2) and 4) A pre89 ECU hacked into an '89+ chassis?

3) The HAC sensor connector. The HAC sensor is used by the ECU to account for changes in altitude. If you live near sea-level and don't drive in different elevations you may bypass it with a couple resistors, otherwise pick one up (used or new). In '89+ ECUs it is internal. See the diagram linked to below for the HAC bypass resistor values (Just a box on the side):
http://www.fadingworld.com/CRE/Autom...087-88-r21.jpg

That is one terrifying wiring job and the mods appear to be half-assed at best... I wouldn't have bought it for anything more than parts.

08-05-2011, 08:46 PM	#33
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	In your last photos: 1) Fuel resistor pack relay connector. This is normally run to a relay which switches the fuel pump power to a resistor pack to help lower fuel pressure at low loads. It's commonly deleted with aftermarket pumps although this requisite has been largely disproved. 2) and 4) A pre89 ECU hacked into an '89+ chassis? 3) The HAC sensor connector. The HAC sensor is used by the ECU to account for changes in altitude. If you live near sea-level and don't drive in different elevations you may bypass it with a couple resistors, otherwise pick one up (used or new). In '89+ ECUs it is internal. See the diagram linked to below for the HAC bypass resistor values (Just a box on the side): http://www.fadingworld.com/CRE/Autom...087-88-r21.jpg That is one terrifying wiring job and the mods appear to be half-assed at best... I wouldn't have bought it for anything more than parts. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->