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-   -   454 mag mpi running rich!!! (https://www.offshoreonly.com/forums/general-q/355760-454-mag-mpi-running-rich.html)

articfriends 08-05-2018 07:03 AM
Originally Posted by BUP (Post 4641615)
A scan tool will verify if the coolant temp sensor is working correct plus one can check to see if the temp gauge on the dash is reading the same temps as well.

Steve --- Is that the stock tune ? and what Mefi is the display from ? 60 thru 120 is reading Base pulse width modifier at 1 - that does not seem like the stock cal if I recall correctly ?
Thats a screen shot of a un-molested stock gen6 2000 502 mefi-3. Keep in.mind mefiburn shows it in celcius.

cableguy1979 08-07-2018 08:19 AM
Do you think its the same for the unmolested GenV?

BUP 08-07-2018 09:37 AM
Originally Posted by articfriends (Post 4641836)
Thats a screen shot of a un-molested stock gen6 2000 502 mefi-3. Keep in.mind mefiburn shows it in celcius.
Yes I know it was in Celcius plus C shows on your screen shot, I just did the conversion in my head from C to F and that was way off in temp ranges because I had it all screwed up. I had to convert it online inwhich showed the correct converted temps from C to F.

BUP 08-07-2018 09:40 AM
Originally Posted by cableguy1979 (Post 4642210)
Do you think its the same for the unmolested GenV?
if you scan the engine with Merc DDT or Diacom or any other marine scan tool you can see your coolant temp reading. I doubt your app defaulted to -40 below for coolant temp.

Tractionless 08-07-2018 10:17 AM
'96 7.4 LX Mpi here and I had an intermittent rich issue. Wound up being a damaged TPS harness. I would wiggle the harness and you'd see black smoke, hold it at a certain angle and it cleared up.

To elaborate, I replaced the plug on the harness side.


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