2003 trouble after Air Flow Sensor install

biddle

Forum Moderator
Staff member
Joined
Mar 9, 2003
Thunderbird Year
2005
What prompted you to install a new MAF? Did the car start correctly prior to that?

Put the old MAF in and see what happens.

PS they make MAF cleaner that often restores the sensor to an operational state.
 
Joined
Dec 28, 2021
Thunderbird Year
2004
What prompted you to install a new MAF? Did the car start correctly prior to that?

Put the old MAF in and see what happens.

PS they make MAF cleaner that often restores the sensor to an operational state.
Good advice. My experience on another car is that aftermarket units don't work. Had to buy a reconditioned OEM unit. What's the exact history of your units?
 
Joined
May 25, 2021
Thunderbird Year
2003
What prompted you to install a new MAF? Did the car start correctly prior to that?

Put the old MAF in and see what happens.

PS they make MAF cleaner that often restores the sensor to an operational state.
The car ran and started just fine before installing MAF. I installed it because of AIR warning on OBD. After install car starts but only after several tries. Battery and starter motor seem good. I followed your advice and re-installed the old MAF. I'll see what happens today. LOVE YOUR CLUB
 

biddle

Forum Moderator
Staff member
Joined
Mar 9, 2003
Thunderbird Year
2005
The car ran and started just fine before installing MAF. I installed it because of AIR warning on OBD. After install car starts but only after several tries. Battery and starter motor seem good. I followed your advice and re-installed the old MAF. I'll see what happens today. LOVE YOUR CLUB
Make sure you clean it with MAF Cleaner- https://amzn.to/3TD7Uza

I do it once a year on my cars. The MAF cleaner evaporates quicker than throttle body cleaner and is better since the MAF is sensitive.
 
Joined
May 25, 2021
Thunderbird Year
2003
I changed back to the original MAF but hard starting continued. I did not disconnect the negative terminal of the battery....it looks like that was my mistake?? If I disconnect the battery now, will that "reprogram" the computer?
 

doug7740

Active Member
Joined
Dec 29, 2014
Thunderbird Year
1955
You stated that you installed the Mass Airflow Sensor because of AIR warning on OBD, what were the fault codes that were stored?

Here are the fault codes related to the Mass Airflow Sensor:

P0102 - Mass or Volume Air Flow Circuit Low Input
P0103 - Mass or Volume Air Flow Circuit High Input
P0104 - Mass or Volume Air Flow Circuit Intermittent
P1100 - Mass Air Flow (maf) Sensor Intermittent
P1101 - Mass Air Flow (maf) Sensor Out Of Self-test Range

Without a fault code you will have to rely on the No DTC(s) Present Symptom Chart for hard starting.

doug7740
1955 Thunderbird Blue

Hard Starting.jpg
 

doug7740

Active Member
Joined
Dec 29, 2014
Thunderbird Year
1955
Here is a Technical Service Bulletin for idle fluctuation - hard starting.

doug7740
1955 Thunderbird Blue

Hard Start 1.jpg
Hard Start 2.jpg
Hard Start 5.jpg
Hard Start 3.jpg

Hard Start 4.jpg
 
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