[cali 5.0]

pulled codes today ion my car and i got 67, 33, 41, 66, and 91, looked it up on all data and found that 41 and 91 are lean mixture reading at the o2 sensors on both sides, 41 is the left side and 91 is the right side i think, for 67 it said that i had high voltage at my neutral safety switch or ac circuit i think, for 33 it was the mass air sensor, and code 66 was egr solenoid,
Im very overwhelmed and do not know where to start or what to think..
and when i drive the car i kinda get tha feeling that its not coming out of closed loop (the computer doesnt know that the engine is warm) cant remember if thats open or closed

 

[Bill]

you need to put the car in neutral when checking for the codes or you will get code 67. i delt with this before.
or you left your A/C on while doing the test.

 

[Bill]

and 33 is the EGR and 66 is the Maf

 

[cali 5.0]

ok so wht about the lean mixture, and how do iu check the mass airflow

 

[Bill]

im trying to figure that out too. thats like low voltage of the maf.(maybe we just have to clean them) i just pulled my codes tonight with the jumper wire and check engine light method. works awesome.

these are the codes i got

KOEO- 51 and 66

KOER- 94, 44 and 21

 

[cali 5.0]

what year is it,, well since the voltage is low then i must have high resistance somewhere then right,?? when i was changing the motor mount i noticed that on the driver side that their is a grounding wire for the battery to ground itself, anyway i saw that the wires insulation was kinda stripped away a little bit, it wasnt much tho, but would that cause high resistance???

 

[Bill]

this is what some one sent me when i told them i got code 66.

Code 66 MAF below minimum test voltage.
Insufficient or no voltage from MAF. Dirty MAF element, bad MAF, bad MAF wiring, missing power to MAF. Check for missing +12 volts on this circuit. Check the two links for a wiring diagram to help you find the red wire for computer power relay switched +12 volts. Check for 12 volts between the red and black wires on the MAF heater (usually pins A & B). while the connector is plugged into the MAF. This may require the use of a couple of safety pins to probe the MAF connector from the back side of it.

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).

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/te...nks-ign-ac.gif

http://www.veryuseful.com/mustang/te...1eecPinout.gif

^^^^ courtesy from Jrichker from Stangnet

 

[cali 5.0]

do u think that maybe it was an old code, because their has been a couple of times where i hav had the running with the mass air flow disconnected, becuz when i unplug the sensor, the light somes on right away and then i plug it back up and it turns it right off, maybe i should check the voltage to the sensor and see what it says

 

[Bill]

hahaha i asked the same thing and im trying to find out as well. i started the car with out the Maf connected and it ran like shiz and the engine light was going on and off. found out i left it unconnected and plug it back in and no engine light and ran fine.
so im trying to find out if with the maf not connected if that tripped the 66 code.

 

[cali 5.0]

but when i unplug the sensor it idles a lot better