jamesmartin
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you will have a plug with thick brown wire and white/purple wire amongs others some times its a brown connector
2.5 N/A to 3.9 V8 EFi Conversion
- Thread starter Tmo
- Start date
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Guys I am really struggling with the wiring for my efi and am loosing interest as after hours of reading I don't seem to be getting anywhere with it.
As per photos before I have spliced into wires by white plug and have connected as follows:
White/purple-fuel pump + fuel pump - to chassis
Brown to + on battery
White/grey to ignition barrel connectors when ignition is in on position
I have - on batt goes to chassis a braided strap on right side of head goes to bulkhead and another at front from engine block all as clean earths
The only other connections are + from batt goes to starter motor and old diesel fuel wire cut off goes to + on coil
At present I have no relays clicking no spark and no injectors firing when I fit a per,ament feed to fuel pump.
I have checked and ecu has 12v going to it as well as relay connector blocks but nocliks and it's not doing anything other than turning over
Questions I have:
Is there any other wires I have missed out?
Does existing loom need to be spliced into efi loom anywhere the starter leads don't go into the efi loom at all?
How many and where do earths need to go?
Who knows someone in Hampshire that can do this for me and what do they charge?
Your help would be greatly welcomed
Thanks Josh
Will relays click with how I have this wired
As per photos before I have spliced into wires by white plug and have connected as follows:
White/purple-fuel pump + fuel pump - to chassis
Brown to + on battery
White/grey to ignition barrel connectors when ignition is in on position
I have - on batt goes to chassis a braided strap on right side of head goes to bulkhead and another at front from engine block all as clean earths
The only other connections are + from batt goes to starter motor and old diesel fuel wire cut off goes to + on coil
At present I have no relays clicking no spark and no injectors firing when I fit a per,ament feed to fuel pump.
I have checked and ecu has 12v going to it as well as relay connector blocks but nocliks and it's not doing anything other than turning over
Questions I have:
Is there any other wires I have missed out?
Does existing loom need to be spliced into efi loom anywhere the starter leads don't go into the efi loom at all?
How many and where do earths need to go?
Who knows someone in Hampshire that can do this for me and what do they charge?
Your help would be greatly welcomed
Thanks Josh
Will relays click with how I have this wired
jamesmartin
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have you put black earth wires to lh head
jamesmartin
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from the loom
Ahh I wonder where these are then? I only have engine loom from rrc will this still have the black wires then?
I know I'm sounding really stupid James but struggling big time, is it these wires from the loom that provides the earth to the ecu circuit?
I know I'm sounding really stupid James but struggling big time, is it these wires from the loom that provides the earth to the ecu circuit?
jamesmartin
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yes usually fasten to stud on lh as seated in the car head
James you are a star I found 2 black wires on there own in plastic conduit with bare ends attached them to the head and bam main relay clicks and fuel pump relay clicks fuel pump runs when cranking then fuel relay clicks 4 secs later can't believe how 2 wires make a huge difference still have no spark though or injection as plugs are dry after cranking.
Further questions
What makes injection work?
I have 2 wires from loom going to coil, wire from maf going to negative and old fuel shut off lead from diesel going to + any ideas?
Further questions
What makes injection work?
I have 2 wires from loom going to coil, wire from maf going to negative and old fuel shut off lead from diesel going to + any ideas?
jamesmartin
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coil will have 2 wires for amplifier and a lead from loom for ecu and 12v feed
dom140
New Member
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- Manchester
Hiya TMO Im at the point of starting my 3.9 conversion. The dash turns on, the relays click on and the engine cranks, but no spark and dont think the pump is doing anything, but it does work. What is it you have done to achieve spark and get it to fire over? I dont want to sound like a numpty but im pulling my hair out
jamesmartin
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is coil wired up correctly ,does pump run for 4 seconds then go off when ignition on ,then comer back on when cranking
dom140
New Member
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- Manchester
The coil is wired as it was in the discovery i didn't unplug anything i just unbolted it from the body and sat it on the engine with wires still connected. But it might need something extra added to work in my vehicle? And no the fuel pump Dosnt seem to do anything. Its connected to the white purple and earthed to chassis. But it does work perfectly when tested with a pos / negative straight to battery. Shot fuel right over me!
jamesmartin
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do both tin relays click when ignition on
dom140
New Member
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- Manchester
Yes both click as far as i can tell with my ear upto them
jamesmartin
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you need to feel them so you know both work
dom140
New Member
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- 20
- Location
- Manchester
If they do both click what's next? as Im 100% the white/purple to fuel pump isn't sending a signal to prime fuel pump when i turn the key
