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Wierd GM IAT and GM 3bar sensor readings

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Devilsfutbol17

15+ Year Contributor
406
48
Jul 27, 2007
Bellingham, Washington
For some reason my car started studdering while I was giving it partial throttle while cruising. I have recognized it two days in a row now only on my way home from work(25 mins one way).

So I logged my trip home today and I noticed my GM 3bar wasn't as continuous as I would expect it to be. There are more than a few places where it plunges instantly and comes back up. Then I also noticed my GM IAT was doing this sometimes too. Is this normal?

I'm posting a log so what I'm talking about can be seen, its easy to find if you just graph the GM IAT and the GM 3bar. Thanks
 

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I swapped ECUs and it seemed to be working on the test drive. Then I pulled over and reviewed the log which looked great. Then on the way back home it went to shit again.

So I swapped in my Omni 4bar sensor from my other car and went for the same drive and it worked perfectly, reading even smoother that the GM 3Bar. For some reason the GM IAT sensor is have occasional hickups, but that doesn't seem to cause any negative effects.

I'll end up getting a new Map sensor and IAT sensor.
 
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