Mode $06 Data Anyone?

[TexomaExplorer]

1996 Ford Explorer 2WD XLT 4.0 Automatic - Mode $06 Data -- Lots of fails. Anyone able to understand this?

Test report:
------------------
TID:$01 CID:$11
- Rich to Lean sensor threshold voltage(constant)
Min: 512
Test result value: 770
PASS
----
TID:$01 CID:$21
- Rich to Lean sensor threshold voltage(constant)
Min: 512
Test result value: 799
PASS
----
TID:$02 CID:$11
- Lean to Rich sensor threshold voltage(constant)
Max: 32,686 Min: 32,850
Test result value: 0
FAIL
----
TID:$02 CID:$21
- Lean to Rich sensor threshold voltage(constant)
Max: 32,686 Min: 32,850
Test result value: 65,535
FAIL
----
TID:$03 CID:$01
- Low sensor Voltage for switch time calculation
Min: 0
Test result value: 461
PASS
----
TID:$03 CID:$02
- Low sensor Voltage for switch time calculation
Min: 0
Test result value: 461
PASS
----
TID:$10 CID:$11
-
Max: 52
Test result value: 25
PASS
----
TID:$10 CID:$21
-
Max: 128
Test result value: 45,055
FAIL
----
TID:$30 CID:$11
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$30 CID:$12
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$30 CID:$21
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$31 CID:$01
-
Min: 40
Test result value: 255
PASS
----
TID:$41 CID:$11
-
Min: 64,512
Test result value: 8
FAIL
----
TID:$41 CID:$12
-
Max: 512
Test result value: 8
PASS
----
TID:$45 CID:$20
-
Max: 20,416
Test result value: 12,736
PASS
----
TID:$4a CID:$30
-
Min: 768
Test result value: 4,400
PASS
----
TID:$4b CID:$30
-
Max: 26,214
Test result value: 13,989
PASS
----
TID:$51 CID:$04
-
Max: 1,835
Test result value: 61,326
FAIL
----
TID:$51 CID:$07
-
Max: 1,835
Test result value: 65,535
FAIL
----
TID:$51 CID:$08
-
Max: 1,835
Test result value: 65,535
FAIL
----
TID:$01 CID:$11
- Rich to Lean sensor threshold voltage(constant)
Min: 512
Test result value: 770
PASS
----
TID:$01 CID:$21
- Rich to Lean sensor threshold voltage(constant)
Min: 512
Test result value: 799
PASS
----
TID:$02 CID:$11
- Lean to Rich sensor threshold voltage(constant)
Max: 32,686 Min: 32,850
Test result value: 0
FAIL
----
TID:$02 CID:$21
- Lean to Rich sensor threshold voltage(constant)
Max: 32,686 Min: 32,850
Test result value: 65,535
FAIL
----
TID:$03 CID:$01
- Low sensor Voltage for switch time calculation
Min: 0
Test result value: 461
PASS
----
TID:$03 CID:$02
- Low sensor Voltage for switch time calculation
Min: 0
Test result value: 461
PASS
----
TID:$10 CID:$11
-
Max: 52
Test result value: 25
PASS
----
TID:$10 CID:$21
-
Max: 128
Test result value: 45,055
FAIL
----
TID:$01 CID:$11
- Rich to Lean sensor threshold voltage(constant)
Min: 512
Test result value: 770
PASS
----
TID:$01 CID:$21
- Rich to Lean sensor threshold voltage(constant)
Min: 512
Test result value: 799
PASS
----
TID:$02 CID:$11
- Lean to Rich sensor threshold voltage(constant)
Max: 32,686 Min: 32,850
Test result value: 0
FAIL
----
TID:$02 CID:$21
- Lean to Rich sensor threshold voltage(constant)
Max: 32,686 Min: 32,850
Test result value: 65,535
FAIL
----
TID:$03 CID:$01
- Low sensor Voltage for switch time calculation
Min: 0
Test result value: 461
PASS
----
TID:$03 CID:$02
- Low sensor Voltage for switch time calculation
Min: 0
Test result value: 461
PASS
----
TID:$10 CID:$11
-
Max: 52
Test result value: 25
PASS
----
TID:$10 CID:$21
-
Max: 128
Test result value: 45,055
FAIL
----
TID:$30 CID:$11
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$30 CID:$12
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$30 CID:$21
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$31 CID:$01
-
Min: 40
Test result value: 255
PASS
----
TID:$01 CID:$11
- Rich to Lean sensor threshold voltage(constant)
Min: 512
Test result value: 770
PASS
----
TID:$01 CID:$21
- Rich to Lean sensor threshold voltage(constant)
Min: 512
Test result value: 799
PASS
----
TID:$02 CID:$11
- Lean to Rich sensor threshold voltage(constant)
Max: 32,686 Min: 32,850
Test result value: 0
FAIL
----
TID:$02 CID:$21
- Lean to Rich sensor threshold voltage(constant)
Max: 32,686 Min: 32,850
Test result value: 65,535
FAIL
----
TID:$03 CID:$01
- Low sensor Voltage for switch time calculation
Min: 0
Test result value: 461
PASS
----
TID:$03 CID:$02
- Low sensor Voltage for switch time calculation
Min: 0
Test result value: 461
PASS
----
TID:$10 CID:$11
-
Max: 52
Test result value: 25
PASS
----
TID:$10 CID:$21
-
Max: 128
Test result value: 45,055
FAIL
----
TID:$30 CID:$11
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$30 CID:$12
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$30 CID:$21
-
Max: 512
Test result value: 65,535
FAIL
----
TID:$31 CID:$01
-
Min: 40
Test result value: 255
PASS
----
TID:$41 CID:$11
-
Min: 64,512
Test result value: 16
FAIL
----
TID:$41 CID:$12
-
Max: 512
Test result value: 16
PASS
----

End of report.

 

[96eb96]

Some of the tests may be unsupported and have bogus data in the registers. I don't think 96es do any evap testing, even though the hardware is there.

You have to look up the test ids in this document and understand how and why they are set. Some may not run in some cases. The most important mode 6 data is test $50, $51, $56. Those are your misfire counters. There should be one for each cylinder in test 51(see page 8 below). What software are you using?

http://www.fordservicecontent.com/ford_content/catalog/motorcraft/obdsm963.pdf

 

[TexomaExplorer]

Torque pro

 

[TexomaExplorer]

I'm having an intermediate misfire on 4. I've changed intake gaskets, coil, plugs, wires, clean and tested injectors, fuel rail gasket, fuel pump, fuel filter, valve cover gaskets, egr tube and body gaskets, thermostat and gasket, maf sensor, iac, oil, filter.
Not overheating, not losing coolant, only misfires sometimes. I can start it, will run fine. Other days I start it and have instant misfire that won't go away. No pending codes, only p0304

 

[96eb96]

Get forscan software, it will work with your obd adapter. Monitor misfire counts in the PCM datastream. Do a quick compression test on that cyl. Carbon buildup could be an issue too. Check for vac leaks UNDER the egr valve.

 

[TexomaExplorer]

Torque can read the misfires, number 4 is super high. The rest are basically nill. You say check for leaks "under" the egr valve, are you talking about where the valve attaches to the egr tube? How can I get rid of any carbon buildup on that cylinder?

 

[96eb96]

You changed many parts, so that eliminates many variables. The EGR valve can leak thru the pintle area. There are vents under the valve and if you run propane you can see the fuel trims and idle change if there is an issue. I recently had that issue. However, a miss like that on 4 is likely something different:
1) What are ltft and stft at idle and 1500 rpm?Make sure you are warmed up. Add them together Close to 0 is best, under 10 is acceptable.
2) Can you do a fuel injector leakdown test? See if the pressure drops after you turn the key on and off, that could implicate a leaky injector. How did you test the injectors? Resistance doesn't always tell the story. Did you move the injectors around?
3) Carbon can build up on the valve, and prevent it from sealing properly. It can also absorb your gas like a sponge. Only way to really know is to remove the lower intake manifold. Seafoam spray in the intake or a professional top engine clean(BG) may be an option here.
4) How does your temp gauge react. On these engines it is normal to move a bit in the 1/4-1/2 range.
Beyond that there could be base engine issues - like bad rings or a tiny crack in the head or gasket. You can test for combustion gasses in the coolant visually (watching the coolant for bubbles as it warms up) or using a block test kit(saw them for rent at autozone). Also a coolant system pressure test...

Does the problem happen on a cold engine or after a few hour restart?

 

[TexomaExplorer]

at idle..
Misfire 1 - 4 count
Misfire 2 - 2 count
Misfire 3 - 0 count
Misfire 4 - 4,071 count
Misfire 5 - 1 count
Misfire 6 - 0 count

Fuel trim bank 1 long term 4.69%
Fuel trim bank 1 sensor 1 -0.78%
fuel trim bank 1 storm tern 0%
fuel trim bank 2 long term 3.12%
fuel trim bank 2 sensor 1 - 7.81%
fuel trim bank 2 short term 8.59%

o2 volts bank 1 sensor 1 0.38v
02 volts bank 1 sensor 2 0.81v
02 volts bank 2 sensor 1 0.59v
02 volts bank 2 sensor 2 1.27v

Swapped injectors around. Tested them via the injector machine at the shop. Cleaned and tested.
The temp stays around slightly under 1/2. I want to say specific is 185-192 degrees.

Can do a fuel pressure test/leak test.
Misfire happens at start up sometimes when its cold, and sometimes only after driving. So its random. But if it starts without a misfire, I can drive it without getting a misfire. But if it starts with a misfire, it drives with one.

 

[96eb96]

Trims aren't remarkable, seem ok.
PCM could shut down an injector with such a misfire. How does the plug look in that cyl?
I would try seafoam (they have one now with a spray nozzle, just loosen the clamp, place against the throttle butterfly, and spray in, makes it easy) or a pressurized top engine cleaner that hooks into the fuel injection manifold. If that creates improvement, then it could be a carbon issue.

Also, a leakdown or compression test. I know the factory scan tool can do a relative compression test, that eliminates everything except base engine issues.

There could also be PCM issues where the drivers go bad - I doubt it for the spark side because it would affect a sister cylinder (waste spark). But it could hold an injector open (you would smell gas) or not fire the injector. A noid light on the injector while it misfires would confirm that.

Usually hard failures like a burnt valve, broken spring, etc are constant and not intermittent.

A very small amount of coolant coming in the cylinder could cause something like this too.