how do you test a mass air flow sensor? - GM Forum - Buick, Cadillac, 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.

Thread Tools Search this Thread
Old 02-02-2005, 03:38 AM   #1  
Senior Member
Posts like a 4 Banger
Thread Starter
Join Date: Jan 2005
Posts: 122
Thanks: 0
Thanked 0 Times in 0 Posts
zo6vette is on a distinguished road
Default how do you test a mass air flow sensor?

how do test to see if a mass air flow sensor is good or bad? iam curious to see if mine is bad, because always at start up my car idle runs little rough then it goes away and if iam sitting at a stop light the idle isn't steady, idle seems to be stumbling, but it drives well with no problems, only when the car is at a stop the idle isn't to smooth, i have new coils, new ign mod, i cleaned the iac motor, new plugs, new pressure regulator, i check the injectors and they are good, iam thinking it might be the mass air flow sensor cause when i stop the idle doesn't stay smooth its little rough? also i get no codes, if a mass air flow sensor is bad would i get service light on? or can it go bad without the service light to come on?

1995 bonneville se model
zo6vette is offline   Reply With Quote
Old 02-02-2005, 07:24 AM   #2  
Posts like a V-Tak
Join Date: Jul 2004
Location: Detroit, MI
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
beakah is on a distinguished road

A quick way would be to tap the top of it, with the butt end of a screw driver, while at idle. If the car sputters, the sensor is bad.

Otherwise your going to have to get the Chilton'* manual and get the DVOM out....
beakah is offline   Reply With Quote
Old 02-02-2005, 09:26 AM   #3  
Junior Member
Posts like a Ricer Type-R
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road

vette, sounds suspiciously like a dirty throttle body to me.

Remove the MAF sensor, and put it in a safe place (you can gently clean the filament of the sensor with rubbing alcohol and a qtip). Remove the TB from the car, remove the TPS and IAC. Now spray and scrub the TB for all you're worth with intake-safe cleaner. Pay particular attention to the IAC passage. Now clean the shaft, spring, and cap of the IAC. Put it all back together.

Even if this doesn't fix the problem (and it'* a 68.9% chance that it will), you probably need to do this anyway.
willwren is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Difference in Intake and Mass Air Flow sensor sprays anthonyv62 1992-1999 1 06-30-2006 04:48 PM
IAT sensor integrated in Mass Air Flow Sensor? cballweg Bonneville GXP/ Northstar Powered Cars 6 05-04-2006 02:37 AM
Mass Air Flow sensor problem telliot647 1987-1991 33 10-03-2004 09:48 PM
Mass Air Flow sensor=transmission problems? killer_cr80r Lounge 8 06-03-2004 11:53 PM
Mass Air Flow sensor JuanMarco19 1987-1991 2 06-17-2003 02:14 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 12:52 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.