reading datalogs - Ford Mustang Forum
 
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post #1 of 5 (permalink) Old 07-23-2010 Thread Starter
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reading datalogs

ok, I want to do a datalog to see if my knock sensors are pulling timing all the time.

What pids do I look at and how do i tell if its pulling timing.

Also is there a pid I can use to see if the car is misfiring??


'08 GT premium 5 spd

just a couple little things
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post #2 of 5 (permalink) Old 07-24-2010
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Try these. You'll need to do a couple of WOT pulls from about 30 mph.

RPM
Absolute Throttle Position
Load
Fuel Rail Pressure
Fuel Pump Duty Cycle
long term fuel trim (both banks)
short term fuel trim (both banks)
Engine Temp (ECT)
Intake Air Temp (IAT)
MAF volts
Borderline Spark
Spark Advance


1965 Mustang Coupe
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post #3 of 5 (permalink) Old 07-24-2010
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It will depend upon what diagnostic equipment you have. I own a Ford WDS scanner. This is the scanner the dealers used to use, but was subsequently replaced by a laptop based IDS system. I believe they both report the same info. I do know if you will be able to see any of these PIDs without one.

The following PIDs are reported by the WDS for this PCM:

MISFIRE - YES / NO
MFF_IAT - Intake Air Temperature at Time of Misfire
MFF_LOAD - Engine Load at Time of Misfire
MFF_PNP - Park/Neutral Position at Time of Misfire
MFF_RNTM - Engine Runnning Time at Time of Misfire
MFF_RPM - Engine RPM at Time of Misfire
MFF_SOAK - Engine Off Soak Time Prior to Misfire
MFF_TP - Throttle Position at Time of Misfire
MFF_TRIP - Number of Trips Since Time of Misfire
MFF_VSS - Vehicle Speed at Time of Misfire

The Mode 6 Data will also report which cylinder is misfiring.

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post #4 of 5 (permalink) Old 07-24-2010
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Also, to the first part of your question, the PCM outputs a PID called "SPARKADV". It provides the amount of spark advance being commanded by the PCM in degrees. It is actually a controllable PID with the WDS, meaning, you can command the amount of spark advance with the scanner.

My stock stradegy showed 16 degrees of spark advance at hot idle.

The Ford PC/ED manual lists the following values for this PID:

KOEO: 0 Degrees
Hot Idle: 15-20 Degrees
30 MPH: 29-38 Degrees
55 MPH: 34-41 Degrees

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post #5 of 5 (permalink) Old 07-25-2010 Thread Starter
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I'll do this. The problem is that I have no idea what the squiggley lines mean.

SCT X3 is what I have to perform this. Thanks for the info stangstta

'08 GT premium 5 spd

just a couple little things
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