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Intstalled Temp Sensor - And now Engine runs real bad

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Old May 19, 2010 | 08:19 AM
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Default Intstalled Temp Sensor - And now Engine runs real bad

Ls1 conversion, with a howell harness and pcm.

I was driving around for about a week with no temp sensor on my engine, (didnt have the pigtail plugged in)

Only problem I had running this way was the motor wouldnt immediately start back up after it got hot.


I now have a temp sensor installed, and plugged in. It runs good for like 5 minutes, and then the engine starts running horrible and the pretty much stalls out.

Its like the sensor is reading the heat increase and then adjusting my air/fuel ratio to the wrong setting. Im finding it strange that the motor ran so much better without it.

I know I need the temp sensor, and plan to run it. I just need to figure out why the motor starts running horrible once it warms up. Your help is greatly appreciated!
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Old May 19, 2010 | 11:12 AM
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What other sensors aren't plugged in?
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Old May 19, 2010 | 11:44 AM
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Might try resetting your PCM.....(disconnect battery for about 5 min)....it "learned" to run bad, now it needs to "relearn" the right way...assuming all other sensors are plugged in, and on a semi stock (unedited) tune file.....spark plugs are probably loaded up too...

T,
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Old May 19, 2010 | 04:10 PM
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All other sensors are plugged in. Guess i'll try the battery thing again, but I had the battery unplugged while swapping in the temp sensor, the battery was unplugged for at least 1/2 hour
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Old May 20, 2010 | 06:58 AM
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Maybe stay w/ 1 thread for the same problem??
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Old May 20, 2010 | 07:17 AM
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Are the front O2's plugged in?
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