MAF sensor code - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-13-2003, 10:23 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2003
Location: Markham, Ontario, Canada
Posts: 239
Thanks: 0
Thanked 0 Times in 0 Posts
faisalmali is on a distinguished road
Default MAF sensor code

A month ago, my SES light came on and the code was 34. I replaced it with a junkyard MAF sensor (about 125,000 km on that part). Then, code 43 came up, and I changed the Throttle Position sensor with a brand new one.

I just came back today from a long trip (and incidentally hit 200,000 km on my car), and after getting home, I got code 34 again. After resetting the codes, the car starts up and stays on, but as soon as I blow some air into the TB with a hair dryer, the car shuts off immediately. The connector shows proper voltage as per Chilton manual.

Am I the only one who is having so much trouble with these sensors? Should I just replace the junkyard MAF sensor with a brand new one (it is more than double the price) - would that solve the problem? Unfortunately, I do not have a code reader, so I can't check gm/sec at idle and WOT, but is the hair dryer check a good check?

Thanks.
faisalmali is offline   Reply With Quote
Old 10-13-2003, 11:52 PM   #2
Senior Member
Posts like a Turbo
 
Join Date: Jul 2002
Location: Cheyenne WY
Posts: 328
Thanks: 0
Thanked 0 Times in 0 Posts
brminder is on a distinguished road
Default

I've never heard of the 'blow dryer check'. Where did you hear about doing that?
brminder is offline   Reply With Quote
Old 10-14-2003, 12:26 AM   #3
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 3,392
Thanks: 0
Thanked 0 Times in 0 Posts
fuddyduddy121 is on a distinguished road
Default

You may have a bad contact at the MAF sensor - check to make sure the terminals are clean. And Code 43 is the knock sensor, by the way.

It seems like blowing air through it may make the PCM confused because the TPS is indicating that there is no throttle angle, but lots of air is coming in.
fuddyduddy121 is offline   Reply With Quote
Old 10-14-2003, 07:24 AM   #4
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2003
Location: Markham, Ontario, Canada
Posts: 239
Thanks: 0
Thanked 0 Times in 0 Posts
faisalmali is on a distinguished road
Default

Sorry, I must have misquoted the TPS code. It was a TPS code, though.

Chilton recommends measuring the frequency at terminals A & B (should be around 1200 Hz) and blowing air through it to see changes in frequency. (I don't know how to measure frequency as my multimeter doesn't seem to have a setting for it). When I first put in my used MAF sensor, I did blow air through it and it did not shut off the engine.

My connection at the MAF sensor looks pretty clean and secure. I even used di-electric grease last time.

BTW, the air intake that holds the air filter was not seated properly on the bottom. Could that cause a problem? It seemed like a very small leak, if any.
faisalmali is offline   Reply With Quote
Old 10-14-2003, 10:55 AM   #5
Senior Member
Posts like a Turbo
 
Join Date: Jul 2002
Location: Cheyenne WY
Posts: 328
Thanks: 0
Thanked 0 Times in 0 Posts
brminder is on a distinguished road
Default

Quote:
Originally Posted by faisalmali
BTW, the air intake that holds the air filter was not seated properly on the bottom. Could that cause a problem? It seemed like a very small leak, if any.
A leak there would not cause an air metering problem, it'* not 'false air' since it'* coming in before the TB and the MAF. It would just let dirty air in, and I suppose a piece of debris could get in and damage the sensor.

I once got a MAF code, the car would buck like a bronco on the highway, I put in a new sensor, and all my problems in life were solved.
brminder is offline   Reply With Quote
Old 10-14-2003, 01:16 PM   #6
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jul 2003
Location: Markham, Ontario, Canada
Posts: 239
Thanks: 0
Thanked 0 Times in 0 Posts
faisalmali is on a distinguished road
Default

Well, the car seems to be driving fine, for now. The only thing I noticed was that the MAF wires were lying over the spark plug wires. I read somewhere that they should be kept away from each other. So, I hung the spark plug wires onto the stabilizer bar with a tie wrap to keep them away.

I am hoping that this problem doesn't come back. Thanks, fuddy & brminder.
faisalmali is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1991 SSE - code 28 code 39 code 42 - losing sleep labonnita 1987-1991 9 12-26-2009 10:58 PM
maf reading to high setting code p0171? bigdawg56 2000-2005 14 09-08-2007 03:39 PM
MAF Code bossville 1992-1999 11 10-29-2005 12:06 PM
Maf sensor throwing a code Garb 1992-1999 7 09-30-2005 02:05 AM
MAF Sensor (ECM Code 34) Reverand Jim 1992-1999 8 11-05-2002 03:58 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 09:16 AM.


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 Amazon.com and affiliated sites.