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Author Topic:   engine running too cold
mustang7nh posted 11-16-2003 08:26 AM ET (US)   Profile for mustang7nh   Send Email to mustang7nh  
1997 Merc 225 EFI- replaced both thermostats (145 degrees), new spark plugs, new water pump, repaired popit valve. Engine won't warm up at idle. Water flow is very strong out of tell tail. When running on plane, warms up fine and runs great. But as soon as trolling or idling then temps drop again. Engine was on computer and confirmed that it is running at 92 degrees and wouldn't climb any higher. Thoughts?

mustang7nh posted 11-16-2003 08:39 AM ET (US)     Profile for mustang7nh  Send Email to mustang7nh     
should have added my question as a follow up to this post:

Did anyone find out an answer from Merc yet?

Thanks in advance for your help.

Sal DiMercurio posted 11-16-2003 08:59 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
Mustang, I think your Merc is like my Evinrude DFI.
Mine trolls at 92...95 degrees & runs at 135 degrees.
If i'm not mistaken, the fuel injected engines run much cooler then the carbed engines.
I know this engine takes a water preasure guage that gos to 60 lbs where my older 150 carbed engine was only a 30 lb guage so theres alot more water being pushed & pulled through these engines then the older ones for a reason.
mustang7nh posted 11-17-2003 07:33 AM ET (US)     Profile for mustang7nh  Send Email to mustang7nh     
Thanks for the reply Sal,

The problem is that the computer keeps thinking the engine is cold at 92 degrees and adjusts the oil,fuel, etc mix. Hence, it runs rough. Temp climbs to normal when cruising, runs smooth when back down to trolling, but then temp drops off and runs rough again. I'm told the spring that lets the water bypass may be a problem in that its letting water bypass too easily. Apart from this the engine has been phenomenal so its a shame to have this glitch.

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