Edis interferes FP relay ??

[mitsuko]

Here's a little problem I don't really know how to solve .

MS1 V2.2 , extra 029y4a
Edis installed , but no coil packs connected yet .
Ign will remain stock until the fuelmap is dialed in so for now I'm using edis only
to generate the tachsignal

If I turn on the ignition :
The main relay cliks and stays on as it should .
The FP relay also clicks and switches off after abt a second .

But If I connect my edis module after a second the fuel pump relay very briefly cuts out
and immediatly comes on again .
And the rpm gauge on the laptop goes over 10.000rpm for a split second , then back to 0 .
That cycle repeats itself over and over again .
Wich is , needles to say not as it should .

Disconnecting the edis 12V or the pip signal makes the problem go away .
Cranking withg the module connected shows a 300-ish rpm wich I think is right on .
Can't start the car , as my fuelpump isn't installed yet .


Any thoughts ?


Oh and btw here's a picture of my trigger wheel . Machined directly into the crankshaft pulley .
There was a pulley to drive an AC compressor , sadly I don't have an AC on that car so I used it to
cut some teeth .

[DaveEFI]

I've no idea how an EDIS module would react to being powered up with no coils. It might well do strange things.

[mitsuko]

I' most certainly not the first one to use an edis to generate the tach signal
and dial in the fuelmaps prior to adding the coils .

I'm gonna try to power the edis from another source then the fp relay .
Allowing it to remain powered while the ms shuts the FP down , see if that makes a difference .

[jsmcortina]

The EDIS module needs to be powered from MAIN relay, not FP relay.

James

[mitsuko]

I figured as much .

But looking at this diagram it's clearly wired off the fp relay .
Ofcourse it says coil and not edis , hence my confusion .

I'll rewire ittomorrow , should be ok then .

[dontz125]

The COIL should be powered off the FP relay. The EDIS module should be powered off the main relay. The coil and the EDIS module are two different devices.

[mitsuko]

Rewired it , and now all's as it should
Fired the car up today , bit of a rough idle ,, but hey , it's idling .

Thx for the replies .