MSefi.com read only forum (Jan.15,2018)

I installed an MS1 3.0 into my 1982 Ferrari 308 restoration project, and it does not want to start or run cold, it runs quite nicely when it finally gets up to 130 F, cats are happy, no smoke, AFR is right on, warm idle is smooth at 1000 rpm, vacuum is good, the 02 sensor looks perfect on the data logs, but in spite of much tweaking with the cranking parameters, after-start enrichment, and warmup, it does not want to run when cold.

I have to baby the gas pedal constantly to keep it running when cold, I can't seem to find settings where it will settle down and fast-idle, I put in the original Bosch fast idle air valve back in, and seems to work as it should on the bench, ie. 12 v and the heat gun make it close up slowly as the engine warms , but the engine does not want to run at a high idle when cold, this is my second ECU (actually 3rd engine) efi project, so have some experience, I thought I knew what to do, but this one has stumped me.

any help would be appreciated.

thanks

Andy

This sounds like you can't get enough air in the engine when it is cold. I'm basing this on your saying it runs if you baby the gas pedal. Do you have a throttle plate idle stop screw you can adjust ? Are you sure the fast idle valve is fully open ? Those are the places I would check. Once you get it to run when cold, even if the idle is higher than you want, then you can adjust the fuel and spark and hopefully be able to lower the idle.

andy2175m4 wrote:I installed an MS1 3.0 into my 1982 Ferrari 308 restoration project, and it does not want to start or run cold, it runs quite nicely when it finally gets up to 130 F, cats are happy, no smoke, AFR is right on, warm idle is smooth at 1000 rpm, vacuum is good, the 02 sensor looks perfect on the data logs, but in spite of much tweaking with the cranking parameters, after-start enrichment, and warmup, it does not want to run when cold.

I have to baby the gas pedal constantly to keep it running when cold, I can't seem to find settings where it will settle down and fast-idle, I put in the original Bosch fast idle air valve back in, and seems to work as it should on the bench, ie. 12 v and the heat gun make it close up slowly as the engine warms , but the engine does not want to run at a high idle when cold, this is my second ECU (actually 3rd engine) efi project, so have some experience, I thought I knew what to do, but this one has stumped me.

any help would be appreciated.

thanks

Andy

The Bosch EAV is usually very reliable. If you remove the hoses to it, the idle should shoot up to around 1500rpm when hot. If not, there must be a blockage in the passages to/from it.