injector order wasted spark setup

bens_cab · Post by **bens_cab** » Mon Jul 10, 2006 9:11 am

Hi guys

just a quick question im running v3 msns-extra 029q2

its wasted spark so 1&4 and 2&3 whats the best way to wire my injectors
1&4 to bank 1 2&3 to bank2???
or should i be doing this differently does it even matter???

at present i have 1&4 bank1 and 2&3 bank2

bens_cab · Post by **bens_cab** » Mon Jul 10, 2006 11:35 am

to add injury to insult ive got a weird over heating petrol thing going on fuel pump screaches and filter is very warm to touch im using the standard k-jet fuel pump accuilator and surge tank with a digifant fuel filter

20vt fuel rail and regulator 20vt fuel pump relay

any ideas

really silly question is if for some stupid reason i got the feed and return pipes on the fuel rail the wrong way round would it run enough not to notice and cause the fuel to heat up

i havnt checked this yet as i think if they were round the wrong way the car wouldnt rev as it does

keithmac · Post by **keithmac** » Mon Jul 10, 2006 12:55 pm

Check the in-tank lift pump, if that`s not supplying fuel to the main pump the main pump will overheat and sieze quite quickly..

I don`t really think it matters which channel go to which injector, maybe run 1 and 4 together on channel1 and 2 and 3 on channel2?.(just read this is how it`s wired

)

You could check which is fuel feed by removing the pipes from the solid lines in the engine bay and getting a mate to quickly turn the ignition on/off, the prime from the MS would fire the pump, be carefull not to squirt fuel everywhere though!

bens_cab · Post by **bens_cab** » Mon Jul 10, 2006 1:30 pm

i think it may be the clear plastic box i have near my fuel pump im sure its some kid of recycle catch tank which was standard on late mk1 cabs

that being the case the fuel isnt making it back to the tank but straight back to the pump does that make sense

been thinking hard about this and i 99% sure it has somthing to do with that plastic thingy mk1 hard top golfs didnt have it why ??

bens_cab · Post by **bens_cab** » Tue Jul 11, 2006 12:30 pm

right found the problem thanks to keith my intank pump isnt getting any power should this be controlled via the relay the same as the main pump

can i just splice the 2 wires together even tho there a different gauge wire
my main pump runs of the fuel pump relay so onlys for 2 secs with ignition then on with crank and run

so basicaly cut into the live 12v supply to the main pump and solder the lift pump live to that

what voltage should they draw just 12v cos ive just put my meter to check and its saying 17v but then it is a cheap crappy meter the batery says 17v too??

T3Bunny · Post by **T3Bunny** » Tue Jul 11, 2006 12:51 pm

On my installs, I run both the main and lift fuel pumps off the relay for the MS.

Its actualy better to wire injectors 1+3 and then 2+4 together. This way its a more even drop across the fuel rail. Less pulsation this way. Since we are not talking about sequential injection, the injectors should be wired up so they cause the most even pressures on the fuel system possible.

T3Bunny · Post by **T3Bunny** » Tue Jul 11, 2006 1:00 pm

Oh, the MK-1 cabbies around 1987 have a WEIRD setup with that plastic tank. The best thing to do is undo your feed line up front, and make SURE its your feed line. Practice safe procedures here of course... If you hook feed and return up wrong... And on these cars the "blow test" will actualy return fuel out of that box and out the return into the tank, either line you blow into.

This setup is a WEIRD combination of the CIS and the Digifant fuel systems. To look up parts in the ETKA you actualy have to pull up BOTH types of fuel systems. Its a surge tank. In theory, because of the way its working, it could heat you fuel up more than normal at its returning fuel into the same tank its sucking fuel from. Its a strange setup for sure. I stared at the first one I saw for quite some time trying to figure out what was going on.

bens_cab · Post by **bens_cab** » Tue Jul 11, 2006 1:02 pm

so basically i could in theory wire both to the sam point on the fuel pump relay the lift pump itself is only small so was worried about overloading it as its in the tank

T3Bunny · Post by **T3Bunny** » Tue Jul 11, 2006 1:05 pm

Wire both up to your MS fuel pump output. It workes fine. Did you see our old thread on the Vortex?

Yes, I MSed a MK1 cabby not too long ago actually. We had some weird issues because of the confusion the tank caused. DEFINATLY open a line and power it on for a sec and make SURE you got the lines hooked up right up front. We defiantly didn't have them right and it caused some weird issues. I hooked up a gauge to the digi rail and saw it wasn't getting any fuel pressure with the pumps running. The fuel definatly got hot quickly too this way.

bens_cab · Post by **bens_cab** » Tue Jul 11, 2006 1:10 pm

i pretty sure the lines are on right i took them off to day and blew down the return and could here the fuel entering the tank i tried the same with the feed but couldnt blow down it

also the car does run ok on tickover and i have driven it lighty with auto tune on but gets worse the hotter the fuel gets so im hoping that cos the lift pump isnt powered its causing the main pump to work harder causing more heat

i couldnt believe it when it first fired up i was amazed at how easy it was a 20vt on megasquirt wow just need to do the hard bit now get it running right

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injector order wasted spark setup

injector order wasted spark setup

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