P0300 code

[Kpc01]

dealer is stating they can not pin point cause of random misfire by computer, been in twice. they are now saying I need to have the headers redone, any thoughts?

 

[hemihustlin]

What did they say exactly was the problem with the exhaust manifolds? Is the truck stock?

I wouldnt let them repair anything unless they are sure that it will fix the problem.
I would take it to a reputable independent garage and get their opinion.
But first get ours, more details are in order

 

[chefred112]

p0300 could mean almost anything..it's like a p0700 code..there should be followup codes to get to the root of the problem.. can you give us more details of your motor? any mods?

 

[Kpc01]

Sorry guys not headers the heads need to be redone, I have Torque pro app and only see the P0300 code there are modes, Here are some of the failures. I could E-mail the full report to anyone that wishes to see it.
MID:$31 TID:$95
- EGR Monitor Bank 1
Max: 227.67999% Min: 334.67999%
Test result value: 324.85999%
FAIL
MID:$3c TID:$86
- EVAP Monitor (0.040")
Test incomplete or dependant test failed

 

[chefred112]

need a new egr valve? that can cause a misfire or hesitation..

 

[Kpc01]

I replaced the EGR valve two years ago, wouldn't I receive a code for it going bad? Is there a check I do do to test it?

 

[RonJon '06]

Is it running/idling rough? How many miles are on the truck and how many on the spark plugs?

 

[chefred112]

the code you posted earlier was an egr error..how did that info come about?

 

[Kpc01]

I am able to pull codes with Torque pro app. It was one of the Mods in the test results.

 

[Kpc01]

It only idles and runs a little rough first thing in am and not all the time.Once I give it some gas it runs fine. Plugs have roughly 3000 miles on them I had new ones put June this year.

 

[RonJon '06]

Sorry guys not headers the heads need to be redone, I have Torque pro app and only see the P0300 code there are modes, Here are some of the failures. I could E-mail the full report to anyone that wishes to see it.
MID:$31 TID:$95
- EGR Monitor Bank 1
Max: 227.67999% Min: 334.67999%
Test result value: 324.85999%
FAIL
MID:$3c TID:$86
- EVAP Monitor (0.040")
Test incomplete or dependant test failed

I'm not sure if I'm reading these results right but it looks like it's finding a fault on Bank one. One of the things that can cause a p0300 is a bad front O2 sensor. You could try swapping the front O2 sensors to see if the error follows to the passenger's side.

 

[chefred112]

..what plugs are you running?

 

[Kpc01]

any other thoughts guys?

 

[chefred112]

again, what plugs are you running? hemi's don't like platinums or iridiums..causes undo resistance in the coil packs and over workin them...

 

[Kpc01]

Not sure on plugs, I may have to pull one to see. You really think an o2 sensor would cause the P0300code?

 

[Kpc01]

I pulled a plug they are champion RE14 MCC4, shouldn't there be some sort of gel in the pack to help make contact to the plug?

 

[chefred112]

good, your using stock coppers so it rules that out...are your P0300's random or do they pop all the time? Are you seeing performance or driveability issues?

 

[Kpc01]

Starting to see more often, no issue other than slight hesitation in engine till I get going and it clears right up.

 

[Kpc01]

Here is a copy of the test results I ran today. I changed the plugs and cleared the light, I also put in a new ignition coil, plan on moving it around if light returns.

Test report:
------------------
MID:$01 TID:$91
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$02 TID:$07
Minimum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
Max: 0.392V Min: 0V
Test result value: 0.392V
PASS
----
MID:$02 TID:$08
Maximum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
Max: 65.535V Min: 0.647V
Test result value: 0.784V
PASS
----
MID:$02 TID:$81
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$82
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$02 TID:$83
- O2 Bank 1 Sensor 2
Test incomplete or dependant test failed
--
MID:$05 TID:$91
- O2 Bank 2 Sensor 1
Test incomplete or dependant test failed
--
MID:$06 TID:$07
Minimum sensor Voltage for test cycle(calculated) - O2 Bank 2 Sensor 2
Max: 0.392V Min: 0V
Test result value: 0.372V
PASS
----
MID:$06 TID:$08
Maximum sensor Voltage for test cycle(calculated) - O2 Bank 2 Sensor 2
Max: 65.535V Min: 0.647V
Test result value: 0.745V
PASS
----
MID:$06 TID:$81
- O2 Bank 2 Sensor 2
Test incomplete or dependant test failed
--
MID:$06 TID:$82
- O2 Bank 2 Sensor 2
Test incomplete or dependant test failed
--
MID:$06 TID:$83
- O2 Bank 2 Sensor 2
Test incomplete or dependant test failed
--
MID:$21 TID:$92
- Catalyst Monitor Bank 1
Test incomplete or dependant test failed
--
MID:$22 TID:$92
- Catalyst Monitor Bank 2
Test incomplete or dependant test failed
--
MID:$31 TID:$93
- EGR Monitor Bank 1
Test incomplete or dependant test failed
--
MID:$31 TID:$94
- EGR Monitor Bank 1
Test incomplete or dependant test failed
--
MID:$31 TID:$95
- EGR Monitor Bank 1
Test incomplete or dependant test failed
--
MID:$31 TID:$96
- EGR Monitor Bank 1
Test incomplete or dependant test failed
--
MID:$39 TID:$87
-
Test incomplete or dependant test failed
--
MID:$3a TID:$87
- EVAP Monitor (cap off)
Test incomplete or dependant test failed
--
MID:$3c TID:$85
- EVAP Monitor (0.040")
Test incomplete or dependant test failed
--
MID:$3c TID:$86
- EVAP Monitor (0.040")
Test incomplete or dependant test failed
--
MID:$3c TID:$90
- EVAP Monitor (0.040")
Test incomplete or dependant test failed
--
MID:$3d TID:$83
- EVAP Monitor (0.020")
Test incomplete or dependant test failed
--
MID:$3d TID:$84
- EVAP Monitor (0.020")
Test incomplete or dependant test failed
--
MID:$3d TID:$85
- EVAP Monitor (0.020")
Test incomplete or dependant test failed
--
MID:$3d TID:$86
- EVAP Monitor (0.020")
Test incomplete or dependant test failed
--
MID:$3d TID:$87
- EVAP Monitor (0.020")
Test incomplete or dependant test failed
--
MID:$3d TID:$88
- EVAP Monitor (0.020")
Test incomplete or dependant test failed
--
MID:$41 TID:$97
- O2 Heater Monitor Bank 1 - Sensor 1
Max: 165°C Min: 0°C
Test result value: 50°C
PASS
----
MID:$41 TID:$98
- O2 Heater Monitor Bank 1 - Sensor 1
Test incomplete or dependant test failed
--
MID:$42 TID:$97
- O2 Heater Monitor Bank 1 - Sensor 2
Max: 190°C Min: 0°C
Test result value: 50°C
PASS
----
MID:$42 TID:$98
- O2 Heater Monitor Bank 1 - Sensor 2
Test incomplete or dependant test failed
--
MID:$45 TID:$97
- O2 Heater Monitor Bank 2 - Sensor 1
Max: 165°C Min: 0°C
Test result value: 45°C
PASS
----
MID:$45 TID:$98
- O2 Heater Monitor Bank 2 - Sensor 1
Test incomplete or dependant test failed
--
MID:$46 TID:$97
- O2 Heater Monitor Bank 2 - Sensor 2
Max: 190°C Min: 0°C
Test result value: 40°C
PASS
----
MID:$46 TID:$98
- O2 Heater Monitor Bank 2 - Sensor 2
Test incomplete or dependant test failed
--
MID:$90 TID:$28
-
Max: 16,384 Min: 26,640
Test result value: 65,520
FAIL
----
MID:$a2 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 1 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a2 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 1 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a3 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 2 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a4 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 3 Data
Max: 65,535Count Min: 0Count
Test result value: 1Count
PASS
----
MID:$a4 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 3 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a5 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 4 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a5 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 4 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a6 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 5 Data
Max: 65,535Count Min: 0Count
Test result value: 1Count
PASS
----
MID:$a6 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 5 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a7 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 6 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a7 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 6 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a8 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 7 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a8 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 7 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a9 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 8 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a9 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 8 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$e1 TID:$87
Manufacturer defined MID -
Test incomplete or dependant test failed
--

End of report.

 

[Redtruck-VA]

I have trouble reading the diagnoses, but if we knew the hierarchy of the tests performed then we might know what test didn't pass or not performed keeping the other tests from being completed. Just a thought..