just make sure the ignition is off when you swap out the ecu.

trying one out on a known-good-running engine is the only way to test
one really.
Extremely unlikely that a bad ecu could harm anything in the fuel
injection.

I'd just run the engine a few minutes.
shut off, plug in the new ecu and start 'er back up.
Ideally both ecu's will act exactly the same.

I also like to *always* pre=run the fuel pump , especially on cold starts..
that is , turn key on, listen for fuel pump to run and then shut off ,
then start it.

if it does that like it should, that's a good sign.

One guy sold or gave me a 'chipped' 2.1 ecu ....
on that one, turn key to on and the fuel pump will run forever....which
is not right.
It also didn't make any difference in power, that chipped ecu.

On 7/10/2015 11:13 AM, John Goubeaux wrote:
> Hi Guys,
>
> I have the chance to pickup another ECU, to use as a backup. The seller
> claims it works BUT I want to confirm this. Can I assume that I can
> fairly easily swap it out in the car and confirm that it DOES work ? Is
> there anything I should be aware of  in doing this?
>
> Thanks  -john
>