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Lazy temp sensor

 
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98ss
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PostPosted: Tue Dec 24, 2013 10:40 pm    Post subject:  Lazy temp sensor Reply with quote

I think I have a lazy temp sensor or a sensor that has taken a "set" Basically the car will only get up to 185 degrees on a 195 degree t-stat. The t-stat is new, I verified the temperature with my scanner to rule out a lazy stepper motor. There are no coolant leaks and I replaced the radiator cap because I found a bunch of brown crap on it, suggesting it was leaking at one point in time. My gas mileage has gone down and I have been chasing the engine hunting at idle while in gear. It has been cold here like down in the 20's and 30's, but it wouldn't get up to temp on a 47 degree day. Also while in traffic the temp would fall roughly 20 degrees when accelerating.
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Bill58
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PostPosted: Wed Dec 25, 2013 12:31 pm    Post subject:   Reply with quote

I had a coolant level sensor get fouled with "brown crap", it turned on the low coolant light. The coolant was full. Might be the temp sensor sludge fouled.
Dose the heater blow hot?
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98ss
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PostPosted: Wed Dec 25, 2013 1:39 pm    Post subject:   Reply with quote

Yes the heat blows hot.
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Bill58
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PostPosted: Wed Dec 25, 2013 3:53 pm    Post subject:   Reply with quote

98ss wrote:
Yes the heat blows hot.

Almost has to be the sensor or wiring. Any cel light or pending code? Is the corrector loose or corroded?
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98ss
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PostPosted: Wed Dec 25, 2013 4:15 pm    Post subject:   Reply with quote

Nope, I have the P0420 code. It might have been the cause for that.
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Pitch Black SS
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1982 Chevrolet Malibu
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PostPosted: Thu Dec 26, 2013 12:12 pm    Post subject:   Reply with quote

98ss wrote:
Nope, I have the P0420 code. It might have been the cause for that.


P0420 is the rear O2 sensor, wont have anything to do with the temp

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Bill58
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PostPosted: Thu Dec 26, 2013 1:41 pm    Post subject:   Reply with quote

98ss wrote:
Nope, I have the P0420 code. It might have been the cause for that.

If the ecm thinks the motor is cold it will fatten the a/f ratio. Could stress the cat beyond the P0420 threshold.
New coolant temp sensor $20 or so, worth a try.
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Pitch Black SS
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PostPosted: Thu Dec 26, 2013 2:04 pm    Post subject:   Reply with quote

rear O2 doesnt read A/F, just air flow. The front O2 does all the important stuff.

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PostPosted: Thu Dec 26, 2013 2:17 pm    Post subject:   Reply with quote

Pitch Black SS wrote:
rear O2 doesnt read A/F, just air flow. The front O2 does all the important stuff.

efficiency, not flow
"A code P0420 may mean that one or more of the following has happened:
Leaded fuel was used where unleaded was called for
A damaged or failed oxygen sensor (HO2S)
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure
Cylinder misfire
Oil contamination

Read more at: http://www.obd-codes.com/p0420
Copyright OBD-Codes.com"
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98ss
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PostPosted: Thu Dec 26, 2013 7:16 pm    Post subject:   Reply with quote

I'm saying that the over fueling must have killed my CAT. I used to get 33-34 mpg, now I get like 26. Its not bad, but still. I will see what happens after I replace the temp sensor.
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