I think you're looking at a mechanical issue, not a sensor problem...
no change in MAP would mean it's not drawing vacuum while cranking. that could point to valvetrain issues. lack of compression would also make it turn over faster.
codes set
12 Direct battery input to PCM was disconnected within the last 50 key-on cycles (normal)
13 No change in MAP from start to run
17 Closed loop temp not reached or engine cold too long
46 Charging system voltage too low
I'd agree that 13 is the only telling code there....
Mike
On 26-Apr, 2011, at 15:34 , <awyse@sw.rr.com> wrote:
> When it is running right.. or as right as it does.. It doesn't crank as fast.. I'm sure it does have significant wear.. it's up over 225K on it.. and they have not been easy miles. This truck is tortured almost as badly as Christine(Tom's, not the Fury)
>
> One of the codes I get is 13 {No difference recognized between the engine MAP reading and the barometric (atmospheric) pressure reading from start-up. ** }
> along with 12, 17, and 46.. Could I be losing signal at MAP sensor?
>
>
> ---- Michael Maskalans <dml@tepidcola.com> wrote:
>>
>>
>> On 26-Apr, 2011, at 12:41 , <awyse@sw.rr.com> <awyse@sw.rr.com> wrote:
>>
>>
>>> I'd try to starft it, and it actually sounded like it was turning over fast like it was low on compression. But would later fire up and smell like it was floooded.
>>> A couple of times. I had to come back and try again in a few minutes.. Each time with the same results.. Would eventually fire, and behave like the choke was stuck for a few seconds.
>>
>> I'd be thinking stuck open injector, but that would not explain the odd crank if it's a fast crank, unless you really have lost compression from ring wear and scoring.
>>
>> Mike
>> six in a row make it go
>>
>
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