MAF LOCATION (mass air flow sensor) - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 12-16-2007, 10:18 AM
Trail02Blazer Trail02Blazer is offline
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MAF LOCATION (mass air flow sensor)

Hello can anyone tell me where the MAF Sensor is located on a 2002 Chevy Trailblazer? Do they even have a Mass air flow sensor? If not, what measures the amount of air passing through into the engine? Because I know that the PCM uses this information to control fuel delivery. thanks
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  #2  
Old 12-16-2007, 11:34 AM
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As far as I know, there were no MAFs on '02 models. They were introduced a few years later.
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Old 12-16-2007, 11:39 AM
AbsoluteZero AbsoluteZero is offline
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It doesn't have a MAF. The PCM "calculates" airflow using it's inputs to determine air density and flow.
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Old 12-16-2007, 12:14 PM
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02's have the older style "Speed Density" type engine control system.
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Old 12-16-2007, 02:12 PM
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I can't believe GM was still using speed density in 02!!! I thought they started using MAF in 94, at least that's when they started using them in the Camaros.

When was it introduced to the Trailvoys?
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Old 12-16-2007, 03:01 PM
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I think some of the 05's and then all of the 06's to present
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Old 12-16-2007, 05:36 PM
Warwagon Warwagon is offline
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Quote:
Originally Posted by seawolf06 View Post
I can't believe GM was still using speed density in 02!!! I thought they started using MAF in 94, at least that's when they started using them in the Camaros.

When was it introduced to the Trailvoys?
1985 Olds 3.8L with bank fire injectors used a MAF.
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Old 12-16-2007, 10:37 PM
Trail02Blazer Trail02Blazer is offline
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Thanks Guys

Thanks guys for all the help!
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Old 12-17-2007, 09:32 PM
ScarabEpic22 ScarabEpic22 is offline
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Well Im pretty sure the 02-05 I6 was the only engine to use SD from GM since the late 90s (except for the I4/I5 Coly engines that are the I6 minus 1 or 2 cylinders). I dont see why its a BAD thing, I think its actually better as its 1 less thing to fail and GM was still able to extract the power and mileage they wanted (did the mpg go up in late 05/06 when the revised I6 was introduced, no). HP/TQ did go up but the MAF has nothing to do with that, its the internal changes GM made that give the boost.
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Old 12-17-2007, 09:35 PM
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Quote:
Originally Posted by blktbz View Post
As far as I know, there were no MAFs on '02 models. They were introduced a few years later.
Well that sux for us 02s
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