Weak spark

Fuel Supply & Ignition Systems
UKLuke72
Posts: 209
Joined: Fri Nov 25, 2011 5:28 pm

Weak spark

Post by UKLuke72 »

MS2 v3.0
2x Bosch BIP373s firing a ford coil (no edis)
Paired 1+3/2+4
36-1
Shielded wire grounded at ECU
Clean tooth log
BPR7ES plugs

Trying to run a new engine in, the 1/2 side runs well and responds to changes, the 3/4 side is rich as hell, plugs wet.
Engine leans out to ~14:1 when the 3/4 side injector's are disconnected. ~7:1

So I tried a new coil, and new plugs, then went into test mode and fired all 4 individually. Lame spark, and inconsistent too, and that's before compression!

What am I missing?
Not sure what else to check.
buildabiggerboxer
Posts: 621
Joined: Wed Mar 25, 2009 12:50 pm

Re: Weak spark

Post by buildabiggerboxer »

Low voltage at coils. Bad earths. Dwell settings wrong.
nbuscemi
Posts: 160
Joined: Sun Oct 18, 2015 5:27 pm

Re: Weak spark

Post by nbuscemi »

Cylinders 1 and 3 should be sharing a coil and 2 and 4 should be sharing a coil. On a wasted spark setup (which I am running, almost identical to yours, except Im using a Dodge Neon coil) companion cylinders share one single coil. Sounds like you've got your secondary wires crossed.

-Nick-
Post Reply