Code 26 mass air problem still

[Kdubslugga]

Heres the deal, I got my car back from my local speed shop in Nov. Runs great when hot but idles like crap when cold, it stumbles, bucks all the good stuff. I was supposed to take it back to them after the motor broke in but whadda ya know there out of business. Car has 2 codes, code 26 MAF flow out of range, and i believe its code 15 for some ECM code which i assume is from the custom chip in it. The car is going to Anderson Ford Motorsport on April 6 getting the PMS system and there going to do the tune i am tired of messing around with crappy shops. I am trying to get the car running as good as possible to cut down on labor costs. This is what i have done so far.

1. Unplugged Mass Air Meter car idles great.
2. changed sensor out with 3 different sensors same result
3. checked for voltage between wires A and B on the connector - it has 11.8 volts
4. check for ohms between MAF SIG and Ground number is above minimum

I have no idea what to do next but i am sure the MAF is the cause of the idle problems because when i unplug it , shes idles great.

 

[jrichker]

Not much help here, but this is what I know...

Code 26 - Mass Air Flow out of range – MAF

There are three parts in a MAF: the heater, the sensor element and the amplifier. The heater heats the MAF sensor element causing the resistance to increase. The amplifier buffers the MAF output signal and has a resistor that is laser trimmed to provide an output range compatible with the computer's load tables.

The MAF element is secured by 2 screws & has 1 wiring connector. To clean the element, remove it from the MAF housing and spray it down with electronic parts cleaner or non-inflammable brake parts cleaner (same stuff in a bigger can and cheaper too).

Look for 12 volts across pins A & B.

The MAF output varies with RPM which causes the airflow to increase or decease. The increase of air across the MAF sensor element causes it to cool, allowing more voltage to pass and telling the computer to increase the fuel flow. A decrease in airflow causes the MAF sensor element to get warmer, decreasing the voltage and reducing the fuel flow. Measure the MAF output at pins C & D on the MAF connector (dark blue/orange and tan/light blue) or at pins 50 & 9 on the computer.

At idle = approximately .6 volt
20 MPH = approximately 1.10 volt
40 MPH = approximately 1.70 volt
60 MPH = approximately 2.10 volt

Check the resistance of the MAF signal wiring. Pin D on the MAF and pin 50 on the computer (dark blue/orange wire) should be less than 2 ohms. Pin C on the MAF and pin 9 on the computer (tan/light blue wire) should be less than 2 ohms.

There should be a minimum of 10K ohms between either pin C or D on the MAF and ground.

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host)

http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

http://www.veryuseful.com/mustang/tech/engine/images/88-91eecPinout.gif

Are you sure that the MAF sensor hand housing are a match with each other?

Have you gone through the "Surging Idle Checklist for help with all your idle/stall problems? Everything you need to find and fix idle problems is in there.

The first two posts contain all the updates to the fixes. At last count there were 24 possible causes and fixes for surging idle/stall problems. I continue to update it as more people post fixes or ask questions.