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3 days no go, today started fine. Maybe NTC.
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Posted by RayF (more from RayF) on Fri, 9 Jan 2015 17:07:56 Share Post by Email
In Reply to: Temperature sensor on the top of the intake, Notnoel [Profile/Gallery] , Wed, 7 Jan 2015 08:51:41
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Temps 7 degrees F. on two mornings, 8 below yesterday morning. Turned on heater aimed at ECU each day and after 20 minutes or a half hour or so car started right up all three days. Today, temp around 18 degrees, car started right up no heat applied.

But it does seem it might in fact be the NTC sensor, because I have noticed it was running a little rough on startup till warmed up some times recently.

So if it happens again I'll unplug the sensor, which should lead to it thinking it's wicked cold out, infinite resistance, and increasing the injector duty cycle accordingly.

I did a search and found two helpful posts by S. Carlson about a year ago, one with these resistance values for a properly working NTC sensor:

"Just did a quick BB search to find these values. Temperatures are in Fahrenheit.

5800ohms at 32 degrees
3800ohms at 50 degrees
3000ohms at 58 degrees
2600ohms at 68 degrees
2000ohms at 76 degrees
1700ohms at 86 degrees
320ohms at 176 degrees"

So if I unplug it I'll get infinite resistance as if on coldest day, and if I jumper it I'll get no resistance as if on hottest day.

Will post once it acts up again, if ever. (I'm an optimist.)


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