Hi all!
I am trying this forum as I am a member of another good one, but seem to have exhausted
my options...
Here goes:
1994 Four Winns cruiser with a pair of 1993 OMC 50FAPRJVN 302 Ford multi-point injection engines.
Issue: Engine temp too cold, computer gives code 21, ECT out of range.
Symptom: After starting the engine, a timer starts. If the engines do not reach
150F after 15 minutes, the map declared the ECT bad and goes into limp mode.
Very rough engine and TRIPLE fuel consumption ensues.
What I did up to now:
With a breakout box, checked all sensors, including ECT, and they work perfectly.
Sometimes right on spec within 0.01ohm. Reference voltage is 5.01V.
I changed the t-stats this spring, and did not pay much attention to the t-stat seat
on the housing. Though the oring would seal everything.
I was wrong. So last week-end, I took the housings off and ask the quite
competent, (though inexperienced with Ford) mechanic to reinstall the t-stats.
After careflly wire brushing the seats, it worked partially.
The right engine went from 125F to 145F and the left engine went from 97F to 140F.
Used DeWalt IR pro thermometer..
Also, riding yesterday, I noticed that the engines were pretty good on idle but would
go in and out of limp mode underway. Fuel consumption also went down by 30%.
Finally, the engines would start very difficultly when stopped for 1-2 minutes,
however they start on a 1/4 turn now. So on the right track indeed.
The bypass holes are clear as well as all other holes in the housing.
Having said this, what other things can I do to heat my engines up?
Both t-stats were tested with boiling water and seem to work fine.
However the left engine at 97F never even got to the t-stat.
Any help appreciated.
I am trying this forum as I am a member of another good one, but seem to have exhausted
my options...
Here goes:
1994 Four Winns cruiser with a pair of 1993 OMC 50FAPRJVN 302 Ford multi-point injection engines.
Issue: Engine temp too cold, computer gives code 21, ECT out of range.
Symptom: After starting the engine, a timer starts. If the engines do not reach
150F after 15 minutes, the map declared the ECT bad and goes into limp mode.
Very rough engine and TRIPLE fuel consumption ensues.
What I did up to now:
With a breakout box, checked all sensors, including ECT, and they work perfectly.
Sometimes right on spec within 0.01ohm. Reference voltage is 5.01V.
I changed the t-stats this spring, and did not pay much attention to the t-stat seat
on the housing. Though the oring would seal everything.
I was wrong. So last week-end, I took the housings off and ask the quite
competent, (though inexperienced with Ford) mechanic to reinstall the t-stats.
After careflly wire brushing the seats, it worked partially.
The right engine went from 125F to 145F and the left engine went from 97F to 140F.
Used DeWalt IR pro thermometer..
Also, riding yesterday, I noticed that the engines were pretty good on idle but would
go in and out of limp mode underway. Fuel consumption also went down by 30%.
Finally, the engines would start very difficultly when stopped for 1-2 minutes,
however they start on a 1/4 turn now. So on the right track indeed.
The bypass holes are clear as well as all other holes in the housing.
Having said this, what other things can I do to heat my engines up?
Both t-stats were tested with boiling water and seem to work fine.
However the left engine at 97F never even got to the t-stat.
Any help appreciated.