IAT Sensor - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-13-2004, 06:41 PM   #1
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Default IAT Sensor

Ok i put a intake on my car back in december 2003 and put my iat sensor in my intake and when i plug it in my fuel mileage gets cut in about half and when i unplug it the fuel mileage goes back up to what it was with the stock air box in and iat sensor pluged in. Its confusing me because the other guys all seem to leave the sensor pluged in and mileage stays the same or goes up. Please help...
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Old 03-13-2004, 11:50 PM   #2
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I would reset the ECM by disconnecting the batt for 30 mintutes, then drive around a few times with it plugged in and perhaps that'll do it. Good luck.
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Old 03-14-2004, 12:33 AM   #3
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I got 40 MPG with an intake pipe & cone filter, my IAT fell to the tranny bell by then most likely.

This would have caused HIGH read temps, and the air was atleast 90% humidity, @ 40 degrees F.....

Now with my temporary stock airbox (just the thumbscrew and tube holding it in) and no IAT milage has gone way down... I may have to put it in again...
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Old 03-14-2004, 12:38 AM   #4
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In the long-term, you'll regret not running it.
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Old 03-14-2004, 03:48 PM   #5
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Will i remember the things you said can happen if you dont have the iat sensor pluged in but i really cant afford the terrible fuel mileage i get when the sensor is plugged in. At first i unhooked the battery for a half a day and then ran the car but fuel mileage was still horrible. So is it looking like i need a zzp mini afc 2.0 and maybe a new iat sensor??
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Old 03-15-2004, 03:09 AM   #6
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Quote:
Originally Posted by jgs11
Will i remember the things you said can happen if you dont have the iat sensor pluged in but i really cant afford the terrible fuel mileage i get when the sensor is plugged in. At first i unhooked the battery for a half a day and then ran the car but fuel mileage was still horrible. So is it looking like i need a zzp mini afc 2.0 and maybe a new iat sensor??
ZZP mini-afc? No, you need to fix the problem. Scan for codes first. Also measure the resistance of the IAT sensor and tell us what the actual outside temperature was when you did so (with a cold engine). Horrible gas mileage needs to be solved in a rational manner, not by putting on a 200 dollar performance part to trick the PCM.
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Old 03-15-2004, 09:04 PM   #7
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Quote:
Originally Posted by willwren
ZZP mini-afc? No, you need to fix the problem. Scan for codes first. Also measure the resistance of the IAT sensor and tell us what the actual outside temperature was when you did so (with a cold engine). Horrible gas mileage needs to be solved in a rational manner, not by putting on a 200 dollar performance part to trick the PCM.
Yeah, what he said. Definately figure out what the real problem is before dumping a bunch of cash into a tuning device.

Shawn
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Old 01-04-2010, 10:48 PM   #8
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http://www.freeautomechanic.com/iat-...mperature.html i found this test the ati and found in a 70 degree room there 2.4 k ohm so im going to replace it and see how well my fuel mileage is this weekend ... hopefully this is the problem that'* causing my crappy fuel mileage
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3.8. l67, 3800, bonneville, bonnie, iat, pcm, ponitiac, se, sensor, sle, sse, ssei

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