Cold start valve (MAC-12D)

[Mike_Buckham at ptk.pioneer.co.uk]

Hi Ben,

It is CIS. The MAC-12D is very similar to the MAC-11 except that it doesn't
have any oxygen sensor input or carbon canister control. It always works in
"open loop" mode. As far as I am aware, the 1B engine that it controls (and
MB engine, I think) is the same as an MC-1 engine but without some of the
emmisions control systems such as the oxygen sensor and the carbon
canister.

If someone could tell me the differences between the 1B, MB and MC-1 then
I'd be very interested.

Cheers, Mike.

>> Message: 9
>> Date: Thu, 4 Dec 2003 09:29:15 -0500
>> From: "Ben Swann" <benswann at comcast.net>
>> Subject: Re: Cold start valve (MAC-12D)
>>
>> Interesting - does the MAC-11 have this feature too?
>>
>> Is the 12D EFI or CIS?
>>
>> Ben
>>
>> [> I know that the cold start valve (as it is known) is pulsed while the
>> > engine is starting and for a brief period afterwards, depending on how
cold
>> > the engine is, but is it also pulsed when the ECU detects sudden
>> > acceleration due to a large change in the MAP sensor input?
>>
>> Yup.
>>


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