benji
20th January 2013, 06:17 PM
I'm starting to get tired of fixing up other people stuff-ups / lazyness.
GEMS injection has all 8 injectors, camshaft sensor, emissions air soloniod and airflow meter sharing a common power source from the EFI relay. This NO (brown and orange) wire comes from the relay, goes through a splice (S501), and then into another splice (S503), which is in the loom under the radiator hose) which is spliced out 11 seperate ways.
What has been done, is that the LPG installer has tapped into the NO wire before splice 503 to turn off the injectors whilst on LPG - but obviously this also turned off the other three sensors also. The installer also put in an EFI chip to allow GEMS to advance the timing more than the factory would allow for LPG, but without a working camshaft sensor GEMS won't advance the ignition = equals dogdy, lazy and dumb installer - stick to your falcommodores boys.
As tapping into 8 wires is harder than one, i've left the original tap before the splice. I cut the camshaft sensor wire, and the airflow meter wire out of the splice, and soldered them to the power side of the LPG cutoff relay (hopefully that sentence makes sense).
The wire that comes out of the relay side of splice 503 goes to the camshaft (you'll know what I mean when you look at it), and the wire that is 2.72mm thick (thicker than the injector wires at 1.88mm) is the one that goes to the airflow meter, and this one comes out ot the back of the splice. The wire that goes to the emissions solonoid is also 1.88mm, but didn't have the time to pull the loom completely apart to find it. I think it's to no effect anyway.
Throttle response improved heaps (as good if not a little better than petrol) and torque is better - though obviously it'll change with more driving.
A stab in the dark would say mne isn't the only GEMS wired up in this lazy way.
So onto another point of previous work, I think someone has put a thermostate where they used to go in the front of the intake manifold. As I squeeze the top tube I can hear the oneway valve in the thermostate clinking.
PS, [Cue Grammy voice] - I'd like to dedicate this post to Bundys spliced rum, very nice.
GEMS injection has all 8 injectors, camshaft sensor, emissions air soloniod and airflow meter sharing a common power source from the EFI relay. This NO (brown and orange) wire comes from the relay, goes through a splice (S501), and then into another splice (S503), which is in the loom under the radiator hose) which is spliced out 11 seperate ways.
What has been done, is that the LPG installer has tapped into the NO wire before splice 503 to turn off the injectors whilst on LPG - but obviously this also turned off the other three sensors also. The installer also put in an EFI chip to allow GEMS to advance the timing more than the factory would allow for LPG, but without a working camshaft sensor GEMS won't advance the ignition = equals dogdy, lazy and dumb installer - stick to your falcommodores boys.
As tapping into 8 wires is harder than one, i've left the original tap before the splice. I cut the camshaft sensor wire, and the airflow meter wire out of the splice, and soldered them to the power side of the LPG cutoff relay (hopefully that sentence makes sense).
The wire that comes out of the relay side of splice 503 goes to the camshaft (you'll know what I mean when you look at it), and the wire that is 2.72mm thick (thicker than the injector wires at 1.88mm) is the one that goes to the airflow meter, and this one comes out ot the back of the splice. The wire that goes to the emissions solonoid is also 1.88mm, but didn't have the time to pull the loom completely apart to find it. I think it's to no effect anyway.
Throttle response improved heaps (as good if not a little better than petrol) and torque is better - though obviously it'll change with more driving.
A stab in the dark would say mne isn't the only GEMS wired up in this lazy way.
So onto another point of previous work, I think someone has put a thermostate where they used to go in the front of the intake manifold. As I squeeze the top tube I can hear the oneway valve in the thermostate clinking.
PS, [Cue Grammy voice] - I'd like to dedicate this post to Bundys spliced rum, very nice.