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P0100 and p0110 code with no cell

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Old 12-18-2011, 03:16 PM   #1
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P0100 and p0110 code with no cell

So I got my scan gauge today as an early Christmas gift from the girl friend and I got it all hooked up nice and found out I have a p0100 and p0110 code. The p0110 is a bad IAT sensor and the p0100 is a mass airflow malfunction. I don't have a cel popping up and truck runs fine except iv always felt it lacks power and it has bad mpg. I get about 15.4 mpg regularly. It's a 99 automatic with the 3rz
Anyone had this symptom and fixed it? Or anyone have ideas as I'll be trouble shooting it. Thanks
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Old 12-18-2011, 04:20 PM   #2
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Sounds like it was unplugged at one point and someone started the vehicle. Make sure it is plugged in, clear the code, and if it comes back, then deal with it. EVERyONE has horrible mpg because of winter gas. That's all
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Old 12-18-2011, 05:27 PM   #3
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no my gas is always horrible lol and so cal doesn't get winter gas mixes im pretty sure.

but yes i did recently unplug and clean the maf but i didnt start the vehicle but i reset the codes and drove a quarter tank of gas so far and no code again...so i will drive for another few days and update this thread with what happens

but in the meantime what would the bad inlet air temp code be cause from? or is that sensor built into the MAF also?
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Old 12-18-2011, 05:57 PM   #4
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If you look at your mac sensor, it is a 5 wire. 3 for maf (power ground and low ref) and 2 for iat. (power low reference). They should be built into each other.
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Old 12-19-2011, 10:44 AM   #5
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*maf. Damn iPhones.
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Old 12-29-2011, 04:44 AM   #6
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I had the same codes on my '97 with no CEL.

Turns out I had some damaged wires between the MAF/IAT and the main engine harness. PO had a ghetto intake system that I was replacing and I found the wires melted from being too close to the exhaust manifold (which was cracked and didn't have a heat shield). The engine ran like crap when it was warm due to the adjusted timing and fuel pressure from the ECM not having the correct MAF/IAT readings. After the wires were repaired it runs smooth as hell, warm or cold.

You might try cleaning the MAF assy first and then checking continuity of the wiring from the MAF connector to ECM.
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