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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
The ECM won't go into "closed loop" until the coolant temp, AND the oxygen sensors are up and running. Normally, 185 or so on the coolant temp will allow closed loop operation, as long as the O2 sensors are jumpin. If not, it will/may never go into closed loop, which would effect the timing, and fuel injector pulse. Continuous open loop running would mean it is runnning rich, with little advance in the timing. Not exactly the best thing.
The prom can be upgraded to a reprogrammed one fairly easily, and this would allow for the lower coolant temps, basically letting the ECM obtain closed loop status at a lower temp.
The prom can be upgraded to a reprogrammed one fairly easily, and this would allow for the lower coolant temps, basically letting the ECM obtain closed loop status at a lower temp.
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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[QUOTE=Adams' Apple]The ECM won't go into "closed loop" until the coolant temp, AND the oxygen sensors are up and running. Normally, 185 or so on the coolant temp will allow closed loop operation, as long as the O2 sensors are jumpin. If not, it will/may never go into closed loop, which would effect the timing, and fuel injector pulse. Continuous open loop running would mean it is runnning rich, with little advance in the timing. Not exactly the best thing.
The prom can be upgraded to a reprogrammed one fairly easily, and this would allow for the lower coolant temps, basically letting the ECM obtain closed loop status at a lower temp.[/QUOTE]
The prom can be upgraded to a reprogrammed one fairly easily, and this would allow for the lower coolant temps, basically letting the ECM obtain closed loop status at a lower temp.
[/QUOTE]
That's what I was trying to say 
, Joel to the rescue 
, Joel to the rescue
Lifetime Member #116
Dave's '82 
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I'm looking at a dual electric fan set-up for my F-150. This particular kit has one fan you set to come on at a lower temp than the second. It also will kick on the high temp fan when the A/C is switched on.
Electric fans will only move air when needed. A pulley mounted fan will be pushing some air almost all the time.
Jim Olson 
"The Toys"...!!! Save the Wave! 
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in Forum: C3 HVAC, Fuel, Emissions, and Exhaust
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