454 MPI advance timing issue
#41
Registered
No, it is a test the ECM does to check to see if its working. It will still detect a knock (if the motor has one) with a code 43. Your just turning off the test. Merc no longer has this test being done by any ECM/PCM
I tuned mine off last year
Edit: should say it will detect a knock if the knock sensor and module is working
I tuned mine off last year
Edit: should say it will detect a knock if the knock sensor and module is working
Last edited by AllDodge; 08-27-2020 at 07:01 AM.
#42
Registered
Here is the original coil... lol. I just got a new one since this one looks like it’s had much better days. Could this be one of my issues? Maybe under load it’s not working properly? It appears my base timing is set correctly with TDC and plug 1 with 8 deg on service mode
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articfriends (08-27-2020)
#43
Registered
AcDelco D560 comes with the bracket.
#44
Platinum Member
Platinum Member
Disagree again,
My repower by a well known OSO member is a MEFI 3 and had the code 44 show up. Don't know how certain you can be that it is not from high octane. I also cannot say its from the gas, BUT (the big but) you can not get a code that is not programmed into the ECM. If it is turned OFF then it will not show up
It is showing up, so it IS programmed
My repower by a well known OSO member is a MEFI 3 and had the code 44 show up. Don't know how certain you can be that it is not from high octane. I also cannot say its from the gas, BUT (the big but) you can not get a code that is not programmed into the ECM. If it is turned OFF then it will not show up
It is showing up, so it IS programmed
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jevonlau (08-27-2020)
#45
Registered
I was surprised to read your statement and didn't believe it to be accurate so I just glanced at a mefi3 stock tune, sure enough "no knock" detected flag 44, I wonder though IF the ecu has a protocol on a mefi3 to "force knock" as a test? I think Ill be turning it OFF on everything in the future, Smitty
On a side note, found out how to mix, so I've been doing a 50/50 of 87/93 to get 90
The following 2 users liked this post by AllDodge:
articfriends (08-27-2020), jevonlau (08-27-2020)
#46
no it was a Sierra marine replacement IC module. I put the factory one back on and both rode the same....