Mercury 240 EFI ENGINE TROUBLE ECU ?

Electrical problems with fresh rebuilt engine.

[@streetratgarage]

I know this is an older video but this information is pretty important. This seems to be a problem. A few people are having and this is the only video that I have seen where it has been resolved. Can you explain what this box looks like and where inside the Consol it is located? Thanks.

[@kartingkart9265]

I have thé same engine with thé same problem. I fond ir. Thérèse s 2 box .one box underground the engine the main rev limiter to avoid going under 6500rpm.you juste have to cut thé wire blanc and yellow to unenable thé box.this wire put to thé ground thé spark.

[@lilslugga999]

i have a 2004 efi that is giving me an alarm and bogging down at about 1200-1500 rpm but is giving no alarm at idle. What can i trouble shoot or how could i rectify this problem

[@5StarPWC]

Check compression and spark on all cylinders first thing,

[@kartingkart9265]

On more time. Disconect thé Black and yellow wire on the revelimiter thé Black box under thé engine. And disconnect the reward rev limiter an other backbox in the place near thé sterring wheel. Those 2 box cut the spark to limit thé Rpm.most of the time this is thé problem. Sometime the injection pressure doesnt work .in this case put on thé valve à pressure monitor to check thé pressure..this way on can check all the injection system

[@kartingkart9265]

Sorry i didn t read well your message. The alarm comme from 2 think. Water il thé White filtre or oil level problème in the litle tank behind the engine.

[@DamnYoustupid-ke8we]

@@kartingkart9265this is correct. He’s trying to explain that all you need to do is cut the black and yellow wire near the steering column. It’s something to do with the idol control when in neutral. They say just to cut it. Nothing else.

[@kartingkart9265]

Wire Black and yellow to cut

[@kartingkart9265]

Depend of your bout sometime There s an other rev limiter for de thé reward speed, you have to cut the Black and yellow wire for this box

[@5StarPWC]

We did figure it out. It was some other little module up under the dash it was some kind of combo neutral switch / rev limiter. We disconnected it and it worked just fine.

[@PapiPapi-w7x]

@@5StarPWC Would you please take pictures of the CDI and the black/yellow wire locations and posted appreciated

[@lilslugga999]

how did you resolve this problem

[@5StarPWC]

There was some sort of CDI up under the dash, we disconnected it and it ran perfect afterwards,, some people were saying it's some sort of neutral safari switch but it looked like a CDI / tevlimiter

[@kartingkart9265]

The cdi is just behind the injection intake an aluminium box

[@kartingkart9265]

If your are stuck let me know, i can help you ,il live in France and i have 3 mercury efi 240 at home ;)

[@moalden3824]

I couldn't find it. Can you please help me to locate it? Thanks

[@andrew..7]

@@kartingkart9265 I’m having the same problem right now. Just bought a pcm

[@isaacgarcia3390]

Carb

[@kartingkart9265]

This in efi so this is injection