Hey guys, i just recently got an autotap and got the following codes when i ran it. I've been having trouble with the car stalling and bucking while driving it, and its been on a real intermittent basis. I have a feeling its a problem with the MAF sensor but i dont want to go get a new one not knowing that that's the problem. Here's the mose recent codes:

P0100 MAF Frequency Insufficient Variation
P0101 Mass Air Flow System Performance
P0102 Mass Air Flow Sensor Circuit Low Frequency
P0103 Mass Air Flow Circuit High Frequency
P0332 Knock Sensor Circuit Low Voltage Bank 2
P1222 Injector Control Circuit Intermittent
P1351 IC Circuit High Voltage
P1361 IC Circuit Low Voltage
P1371 DI Low Resolution Circuit
P0100 MAF Frequency Insufficient Variation
P0101 Mass Air Flow System Performance
P0102 Mass Air Flow Sensor Circuit Low Frequency
P0103 Mass Air Flow Circuit High Frequency
P1351 IC Circuit High Voltage
P1361 IC Circuit Low Voltage
P1371 DI Low Resolution Circuit
P1371 DI Low Resolution Circuit
P1371 DI Low Resolution Circuit

I had some of these codes come up a few weeks ago and then i reset the codes to see what comes up again, and the first time the codes were:

P0100 MAF Frequency Insufficient Variation
P0200 Injector Control Circuit
P0332 Knock Sensor Circuit Low Voltage Bank 2
P1171 Fuel System Lean During Acceleration
P1222 Injector Control Circuit Intermittent
P0100 MAF Frequency Insufficient Variation
P0200 Injector Control Circuit
P0200 Injector Control Circuit

If anyone would like to see the full text files with some readings at the time the codes were thrown, just post your e-mail and i'll get them over to you right away. Thanks guys for all the help, i really appreciate it.
Tom

 

Oh, by the way, when the car stalls or begins bucking, all i have to do is pull over, shut it off and restart and it seems to run fine. Could this be because it is now running in some mode that bypasses the MAF reading?? Im taking this car on vacation and need it to be flawless. Thanks for all the help

 

Do you have a data scan log? That would tell you a lot about whether these are real problems, or perhaps related to a grounding issue.

It appears you may have an intermittent problem with the Opti/IC module and the MAF. A scan showing the MAF gps readout would tell you if the MAF is operating correctly, and if it has an intermittent problem.

The pink wire that feeds +12V to the MAF seems to have a lot of problems on the 1997 models in particular.

With all those codes, I'm surprised there is no "misfire" code.

 

Is the data scan log the full text file with each code followed by readings taken at the time of the code?? I have that, its pretty long tho:

P0100 MAF Frequency Insufficient Variation
P0101 Mass Air Flow System Performance
P0102 Mass Air Flow Sensor Circuit Low Frequency
P0103 Mass Air Flow Circuit High Frequency
P0332 Knock Sensor Circuit Low Voltage Bank 2
P1222 Injector Control Circuit Intermittent
P1351 IC Circuit High Voltage
P1361 IC Circuit Low Voltage
P1371 DI Low Resolution Circuit
P0100 MAF Frequency Insufficient Variation
P0101 Mass Air Flow System Performance
P0102 Mass Air Flow Sensor Circuit Low Frequency
P0103 Mass Air Flow Circuit High Frequency
P1351 IC Circuit High Voltage
P1361 IC Circuit Low Voltage
P1371 DI Low Resolution Circuit
P1371 DI Low Resolution Circuit

P1371 DI Low Resolution Circuit
Mass Air Flow Rate 6.578 lb/min
Engine Coolant Temperature 171 °F
Barometric Pressure 30.07 InHg
Injector Pulse Width Average Bank 1
4.50 ms
Injector Pulse Width Average Bank 2
4.44 ms
Short Term Fuel Trim Bank 1 0.0 %
Short Term Fuel Trim Bank 2 0.0 %
Long Term Fuel Trim Bank 1 0.0 %
Long Term Fuel Trim Bank 2 0.0 %
Manifold Absolute Pressure (MAP) 9.7 in Hg
Engine Speed 736 RPM
Fuel System Status Bank 1 OL-1
Throttle Position Angle 0.0 %
Vehicle Speed 0 MPH
Mileage Since First Fail 134 Mi
Mileage Since last Fail 134 Mi
Calculated Engine Load 17.6 %

P1222 Injector Control Circuit Intermittent
Mass Air Flow Rate 6.578 lb/min
Engine Coolant Temperature 171 °F
Barometric Pressure 30.07 InHg
Injector Pulse Width Average Bank 1
4.50 ms
Injector Pulse Width Average Bank 2
4.44 ms
Short Term Fuel Trim Bank 1 0.0 %
Short Term Fuel Trim Bank 2 0.0 %
Long Term Fuel Trim Bank 1 0.0 %
Long Term Fuel Trim Bank 2 0.0 %
Manifold Absolute Pressure (MAP) 9.7 in Hg
Engine Speed 736 RPM
Fuel System Status Bank 1 OL-1
Throttle Position Angle 0.0 %
Vehicle Speed 0 MPH
Mileage Since First Fail 134 Mi
Mileage Since last Fail 134 Mi
Fail Counter 0
Pass Counter 0
No Results Counter 0
Calculated Engine Load 17.6 %

P1351 IC Circuit High Voltage
Mass Air Flow Rate 6.578 lb/min
Engine Coolant Temperature 171 °F
Barometric Pressure 30.07 InHg
Injector Pulse Width Average Bank 1
4.50 ms
Injector Pulse Width Average Bank 2
4.44 ms
Short Term Fuel Trim Bank 1 0.0 %
Short Term Fuel Trim Bank 2 0.0 %
Long Term Fuel Trim Bank 1 0.0 %
Long Term Fuel Trim Bank 2 0.0 %
Manifold Absolute Pressure (MAP) 9.7 in Hg
Engine Speed 736 RPM
Fuel System Status Bank 1 OL-1
Throttle Position Angle 0.0 %
Vehicle Speed 0 MPH
Mileage Since First Fail 134 Mi
Mileage Since last Fail 134 Mi
Fail Counter 0
Pass Counter 0
No Results Counter 0
Calculated Engine Load 17.6 %

P0102 Mass Air Flow Sensor Circuit Low Frequency
Mass Air Flow Rate 6.578 lb/min
Engine Coolant Temperature 171 °F
Barometric Pressure 30.07 InHg
Injector Pulse Width Average Bank 1
4.50 ms
Injector Pulse Width Average Bank 2
4.44 ms
Short Term Fuel Trim Bank 1 0.0 %
Short Term Fuel Trim Bank 2 0.0 %
Long Term Fuel Trim Bank 1 0.0 %
Long Term Fuel Trim Bank 2 0.0 %
Manifold Absolute Pressure (MAP) 9.7 in Hg
Engine Speed 736 RPM
Fuel System Status Bank 1 OL-1
Throttle Position Angle 0.0 %
Vehicle Speed 0 MPH
Mileage Since First Fail 134 Mi
Mileage Since last Fail 134 Mi
Fail Counter 0
Pass Counter 0
No Results Counter 0
Calculated Engine Load 17.6 %

P0101 Mass Air Flow System Performance
Mass Air Flow Rate 6.578 lb/min
Engine Coolant Temperature 171 °F
Barometric Pressure 30.07 InHg
Injector Pulse Width Average Bank 1
4.50 ms
Injector Pulse Width Average Bank 2
4.44 ms
Short Term Fuel Trim Bank 1 0.0 %
Short Term Fuel Trim Bank 2 0.0 %
Long Term Fuel Trim Bank 1 0.0 %
Long Term Fuel Trim Bank 2 0.0 %
Manifold Absolute Pressure (MAP) 9.7 in Hg
Engine Speed 736 RPM
Fuel System Status Bank 1 OL-1
Throttle Position Angle 0.0 %
Vehicle Speed 0 MPH
Mileage Since First Fail 134 Mi
Mileage Since last Fail 134 Mi
Fail Counter 0
Pass Counter 0
No Results Counter 0
Calculated Engine Load 17.6 %

P1371 DI Low Resolution Circuit
Fuel System Status Bank 1 OL-1
Calculated Engine Load 17.6 %
Engine Coolant Temperature 171 °F
Short Term Fuel Trim Bank 1 0.0 %
Long Term Fuel Trim Bank 1 0.0 %
Short Term Fuel Trim Bank 2 0.0 %
Long Term Fuel Trim Bank 2 0.0 %
Manifold Absolute Pressure (MAP) 9.7 in Hg
Engine Speed 736 RPM
Vehicle Speed 0 MPH
Mass Air Flow Rate 6.578 lb/min
Throttle Position Angle 0.0 %

 

The data shows that all those codes set simultaneously. That is not a problem with individual sensors, its a problem with a ground, a wiring harness or the PCM itself.

A data scan log is a log of the sensor data over an extended period of time... maybe as much as 15 minutes. Shows the values frame by frame for all the sensors and the PCM's calculated parameters.

Have you used AutoTap's data logging capabilities, or are you just using it as a trouble code scanner?

 

I logged a recent drive with it, and i have that file frame by frame. Should i do it at idle for 15 minutes?? will that file be of more use?? what parameters should i be looking at capturing?? Thanks

 

You need a log of the data with the car operating under a wide variety of conditions.... idle, low loads, wide open throttle, etc. A log of 15 minutes of idling would be pointless.

You want to include, as a minimum:

-RPM
-MPH
-coolant temp
-inlet air temp
-MAP
-barometric pressure
-TPS volts
-TPS %
-IAC counts
-MAF
-long term fuel correction cell #
-long term fuel corrections
-short term fuel corrections
-left O2 sensor (pre-cat only)
-right O2 sensor (pre-cat only)
-injector pulse widths, left and right
-spark advance
-knock retard

 

Injuneer, what should i be looking for?? Can you look at the file and be able to tell whats going on?? If so i can send it.

 

This may help. The "cylinder mode misfire index" reading is up at 65,000 at some points and the "Total misfire failures since first fail" is up at 90 or so. What exactly do these readings mean?? Does the computer know that the engine is misfiring?? Could this all be a problem related back to the opti-spark??

 

The data for the really long post you made showed most all those things happened 134 miles ago.