How to identify merc ECU?

[mxz]

Dumb question, but how do you identify which ECU is on a merc EFI? Is the model number under the cover?
Also anyone know what would be the stock ECU for a 90 2.4 Bridgeport EFI?

Thanks

[G-Train]

The ecu # should be on the back of it. It's usually the last 2-3 characters which identify it, A17, A63, A27, etc. I have seen where merc has "engraved" the ID on the back of the ECU also.

I can't remember which ECU came on the 90 Bridgeport EFI, even though I used to have one. I tried 2.5 ECU's on it, and they did not work well. It was best with a Mech TPI, set correctly, and that motor ran "real strong". That was before S&F was around also, I'm sure there are some guys on here who have had some success with other setups.

Good luck

Greg

[sms]

MXZ,

I just sent an ECU off of a 91 Bridgeport EFI this week to Rapair for digital update. It was an A13. I believe the other 2.4 box used was A7.

[skidoo29]

Thanks for asking that question brent, you beat me too it.
the ecu in question is actually mine and my brother was able to beat me to a computer.
SMS or Gtrain, any Idea what the two different ones A7 or A13 are suppossed to rev to, I believe the A7 has a max of 7000 but what about the A13.

thanks for the responses

warren

[G-Train]

I must've had the A13, because I could spin that motor over 8,000 rpm's on an STV pro comp.

G

[sms]

The rev-limiter on the analog ecu motors is a separate component wired to the switch boxes. The factory setting is 7800 on the motor I referenced above. The Rapair digital version renders the rev-limiter obsolete and includes RPM control completely within the ECU management functions. (And can be programmed at any limit you want)

[RSM]

An easy way to identify analog from digital is the digital box will have two wire tails coming out of it the short set is for reading and programming the ECU . The analog will only have the one wire harness. Also the digital boxes ussualy have a white sticker on the side of the box. The "A" in the part number dosn't mean it is an analog. Hope this helps.

[skidoo29]

okay, thanks guys

warren

[aalbert]

For what it is worth, I have a chart up at http://www.biggerhammer.net/mercury/ that displays the various ECUs.


-=Andy

[mxz]

Warren, I checked yours when I was up north today. It has A7 engraved on the back in 2 spots.