Distributor cap and wires

Ransnan

Anyone have the proper plug wire diagram for a spider (flat) cap distributor on a 2003 or newer Efi Merc 5.7 Mag MPI Horizon???   What wire goes to which cylinder,    wrote them down as i took them off, but when i compared the 2 diagrams they were different.  😬oops. Help!!  has to be a Flat cap Distributor 

Aqua_Aura

The 5.7 should be the same firing order as any GM 5.7 this seems to be the order I find when searching. 🤔

Aqua_Aura

This diagram seems different for the distributor but the firing order is the same. Maybe this is the flat top you describe. 

Ransnan

Aqua, i did find that diagram as well, but i have the Spider (flat) cap distributor 5 on one side, 4 on the other side with the odd being the coil wire

Ransnan

There ya go, would that be the same for my EFI. 2003 motor ?

Aqua_Aura

It appears to be for the efi engine. Check this link for someone's truck. Kinda funny the poster submitted the same two photos just like I did 😀 The distributor appears to have the numbers on it from the factory. 

https://www.cargurus.com/Cars/Discussion-c3906_ds683739

Grahamu

Is this your cap?

Ransnan

Yes, that is what I have, probably the one that cost twice as much as all the rest.   Lol

Grahamu

I have the same I will check it tomorrow

Grahamu

Aqua_Aura said:

This diagram seems different for the distributor but the firing order is the same. Maybe this is the flat top you describe. 

This is the correct diagram. The ports on the cap are also numbered.

Ransnan

Thank you !!!  Thats just what i was looking for! Didn't need the firing order , just what plug wire went where 

[Deleted User]

After replacing my distributor cap and rotor, I labeled all the wires with these special zip ties to make life easier in the future. Useful for all wiring projects. Andy https://www.amazon.com/dp/B0153CAU2M/ref=cm_sw_em_r_mt_dp_8X4Y7Z2H9K1EAV2T8ST5

oscar1

good idea