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Old 11-18-2009, 11:49 AM   #1
bouchermb
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Default Mass Air Meter Problems

I purchased a Pro M 95mm mass air meters for his 89 mustang a little less than two years ago. When we installed the meter, the car ran beautifully. After a few months suddenly it began to run terrible. It surges badly, won't idle from a cold start, and any time you give it a little throttle it dies. You basically can't drive the car. Long story made short. I scanned the computer for error codes and everything checked out ok except for one. We found a mass air meter error code. It was mass air meter below 0.4 volts during the last 80 warm ups. Also, He has a wide band 02 sensor with a meter. What we observed was during a cold start up the meter will read from 12:1 to 17:1 afr then after a second or two it'll go lean, off the meter lean like the engine's just not receiving any fuel. Try starting the car again and it repeats this act. When the engine starts to get a little heat in it, it will idle ok for a few seconds but as soon as you give it the slightest amount of throttle it starts acting up again. I am tending to believe that the problem is with the air meter.

Any idea on how to trouble shoot the meter to make sure it's the problem?
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Old 11-18-2009, 03:23 PM   #2
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Originally Posted by bouchermb View Post
I purchased a Pro M 95mm mass air meters for his 89 mustang a little less than two years ago. When we installed the meter, the car ran beautifully. After a few months suddenly it began to run terrible. It surges badly, won't idle from a cold start, and any time you give it a little throttle it dies. You basically can't drive the car. Long story made short. I scanned the computer for error codes and everything checked out ok except for one. We found a mass air meter error code. It was mass air meter below 0.4 volts during the last 80 warm ups. Also, He has a wide band 02 sensor with a meter. What we observed was during a cold start up the meter will read from 12:1 to 17:1 afr then after a second or two it'll go lean, off the meter lean like the engine's just not receiving any fuel. Try starting the car again and it repeats this act. When the engine starts to get a little heat in it, it will idle ok for a few seconds but as soon as you give it the slightest amount of throttle it starts acting up again. I am tending to believe that the problem is with the air meter.

Any idea on how to trouble shoot the meter to make sure it's the problem?
That could also be your TPS. THrottle position sensor. Mine went bad on my car, it would only start when i hit it with starting fluid from autozone, then as soon as i give it gas it would sputter and eventually die after a few seconds.
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Old 11-18-2009, 03:35 PM   #3
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Already checked that out and it seemed to be OK.
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Old 11-18-2009, 07:36 PM   #4
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Do you have a spare meter that is calibrated for your inj needs??? quickest thing you could do is swap on a known good meter, I have a bunch of friends around here that will let me borrow there's to check such often
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Old 11-19-2009, 07:23 AM   #5
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That was my next course of action, but I don't know of someone that has a spare meter that's calibrated to my injectors.
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Old 11-19-2009, 11:15 AM   #6
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craigslist is your friend. bet you can find someone local that will come over and let you swap out for testing for a quick $20
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Old 11-19-2009, 06:38 PM   #7
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Worth a shot and I'll give it a look.
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Old 03-01-2010, 07:23 PM   #8
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yeah i agree, it could be your throttle position sensor that caused your air mass meter not to function well. if you want to troubleshoot it here's how http://www.ehow.com/how_4489318_trou...ps-sensor.html
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Old 03-01-2010, 08:37 PM   #9
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yeah i agree, it could be your throttle position sensor that caused your air mass meter not to function well. if you want to troubleshoot it here's how http://www.ehow.com/how_4489318_trou...ps-sensor.html


holy ****... are you serious noobie???

this thread is from LAST YEAR.... dont be stupid. digging up old threads to further ask for advise is one thing... but dont ADD more advise so far after the thread died
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Old 03-01-2010, 09:53 PM   #10
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yeah i agree, it could be your throttle position sensor that caused your air mass meter not to function well. if you want to troubleshoot it here's how http://www.ehow.com/how_4489318_trou...ps-sensor.html
lol, crazy noob..........do you even know the difference between input and output devices??? FYI THE MAF as well as the TPS are both inputs....please explain how in the "F" ONE INPUT AFFECTS another??? EXACTLY, INPUTS AFFECT output commands = garbage in garbage out.......
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Old 03-01-2010, 09:53 PM
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