CSX3170 first time out with new engine

[Cobra #3170]

Originally Posted by Ron61

Bad things: I am going to have to provide separate ground circuits for 5 separate pins on the ECU back to the battery 3 are 10 gauge to try and prevent noise contamination.

I am not much of a mechanic but could you wrap your wire with a filter type wrap to prevent it picking up noise and other electrician interference? We used that type of wrap on out main frame computers and also in some of the missile guidance systems. I hope that you get it sorted out and am looking forward to your next posts as I try to keep up with what you and Morris do.

Ron

Thanks Ron,

Yes shielded wire is very effective at blocking inductive or capacitive coupled signals. I have it on all the low signal level input lines. This problem is related to voltage drop over ground circuits which effectively lowers input voltage because the computer just sees the difference between ground and input lines. The theory is that the ECU is going into Flash mode which automatically cuts off the fuel injectors and the pulse that fires the MSD.

They think a low voltage condition could cause the jump to flash mode. Since I have 1/0 welding cable for a positive feed to the starter solenoid I am going to upgrade my ground to the same thing and go from the battery to the block. I will also put the ground wires they recommend on the ECU as well just to eliminate that as an issue. The alternator current going up and down as I come off idle might cause a big drop across ground loops so hopefully that solves the issue. I just now moved the car into the garage and it ran perfectly of course, I am not at an event where it would surely quit again.