Random misfire help
11-21-2012, 09:05 PM
#21
I agree 100% with your reasoning. The reason I vote for a CKP variation relearn is, its free, and if a 6.0 has 1 or 2 cylinders missing and a flashing MIL it will be blaitently obvious in the power dept. He said the truck is running fine. Odds are it needs a relearn.
With an unlearned CKP variation the misfire can float and change cylinders as well. Seen it happen numerous times.
You seldom see coils bad on these trucks. Very seldom.
I would not be concerned about PID data on a sensor that looks way out of wack unless there is a code for that sensor/system. If the MAP signal was way off it would have set a MIL and a code for that.
Ryan
With an unlearned CKP variation the misfire can float and change cylinders as well. Seen it happen numerous times.
You seldom see coils bad on these trucks. Very seldom.
I would not be concerned about PID data on a sensor that looks way out of wack unless there is a code for that sensor/system. If the MAP signal was way off it would have set a MIL and a code for that.
Ryan
I have never personally seen a coil go bad yet on one of theses trucks yet. I have seen Computers and wiring issues but never the coils them self's. The only time I have heard of issues with the coils is when guys mess with the Tuning parameters and burn them up.
11-21-2012, 10:34 PM
#24
P0446 Evap Vent System performance could be any thing.
Conditions for setting this code:
The ECU fails to detect a drop in the EVAP system vacuum over a calibrated number of seconds with the vent solenoid open.
First thing to check is the Gas cap. Make sure it seated properly. If the sealing ring around the cap is cracked or damaged, replace it.
Look at the freeze frame data from when it failed. Try and monitor the Fuel pressure sensor in the tank.
You should also be able to preform an evap system test with the Solus Pro.
Conditions for setting this code:
The ECU fails to detect a drop in the EVAP system vacuum over a calibrated number of seconds with the vent solenoid open.
First thing to check is the Gas cap. Make sure it seated properly. If the sealing ring around the cap is cracked or damaged, replace it.
Look at the freeze frame data from when it failed. Try and monitor the Fuel pressure sensor in the tank.
You should also be able to preform an evap system test with the Solus Pro.
11-22-2012, 07:18 AM
#25
P0446 Evap Vent System performance could be any thing.
Conditions for setting this code:
The ECU fails to detect a drop in the EVAP system vacuum over a calibrated number of seconds with the vent solenoid open.
First thing to check is the Gas cap. Make sure it seated properly. If the sealing ring around the cap is cracked or damaged, replace it.
Look at the freeze frame data from when it failed. Try and monitor the Fuel pressure sensor in the tank.
You should also be able to preform an evap system test with the Solus Pro.
Conditions for setting this code:
The ECU fails to detect a drop in the EVAP system vacuum over a calibrated number of seconds with the vent solenoid open.
First thing to check is the Gas cap. Make sure it seated properly. If the sealing ring around the cap is cracked or damaged, replace it.
Look at the freeze frame data from when it failed. Try and monitor the Fuel pressure sensor in the tank.
You should also be able to preform an evap system test with the Solus Pro.
11-24-2012, 09:39 AM
#26
On The Tree
Join Date: Oct 2012
Location: Fort Worth, Texas Area
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Grab the Solus, amd perform a Crankshaft Variation Relearn
I promise that will solve it. It you have ran it for any period of time like that flush the transmission.
A misfire prohibits converter lockup which causes higher trans fluid temps. Hard on fluid. Its cheap maintenance.
Do the variation relearn and post your results, im confident it will fix your problem.
good luck!
Ryan
I promise that will solve it. It you have ran it for any period of time like that flush the transmission.
A misfire prohibits converter lockup which causes higher trans fluid temps. Hard on fluid. Its cheap maintenance.
Do the variation relearn and post your results, im confident it will fix your problem.
good luck!
Ryan
Hey Ryan!! what are you talking about on this thread??? I am having that issue where my contertor will not lock up... sometimes my light comes on... Like this am i let it warm up and light was flashing and now its not WTF!!
.... My tranny temp gets up to 228...
11-25-2012, 07:44 PM
#27
Down and out
Join Date: Oct 2008
Location: Hudson, Wi.
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228 is smoking hot. You need to flush your trans asap, and stop driving it untill its fixed. If that trans went 228 the fluid is junk. Do not ignore it or put it off.
We had to loosen up the misfire counters with HP tuners on one of my 6.0's with a TSP 220R cam, Your running a 224 that im sure has a lope at idle. That will definately cause miss codes. My truck even running flawless would occasionally flash the mil and store some misfire codes at idle and cruising speed. Likely camshaft induced. No issues once my tuner buddy took care of it.
If you did a cam swap, use a good scan tool and complete a CKP variation relearn. If that relearn is not performed after some major mork like that, it could cause erronious misfire counting, flashing MIL, etc. If its counting misfires it will not lock the converter. If its still counting misfires with the relearn performed, contact your tuner about loosening up the misfire counters with HP tuners.
PM me if you have any questions.
Ryan
09-23-2015, 08:54 PM
#28
I never did figure this out. New plugs wires, throttle body, relearn all just the other day, cam position sensor, nothing makes it go away. It only shows up when the fuel is low and the misfire and evap leak large show up at the same time. The misfire only shows up at 0 mph on a scanner. You never feel it.
I'm really tired if the cel and wasting money hunting the issue. I'm up for suggestions.
All O2 Sensors have been replaced as well.
Dirty injectors seem like they would be felt at idle or acceleration?
Clean injectors?
Update the PCM at the dealership maybe?
I'm really tired if the cel and wasting money hunting the issue. I'm up for suggestions.
All O2 Sensors have been replaced as well.
Dirty injectors seem like they would be felt at idle or acceleration?
Clean injectors?
Update the PCM at the dealership maybe?
09-23-2015, 09:03 PM
#29
It Might need an update, but I doubt it.
More likely the charcoal canister or the Purge valve are the issue. Sounds like the Leak is leaning out the motor just enough for a random misfire.
What are your LTFT and STFT at the time of failure?
More likely the charcoal canister or the Purge valve are the issue. Sounds like the Leak is leaning out the motor just enough for a random misfire.
What are your LTFT and STFT at the time of failure?
09-24-2015, 06:37 AM
#30
I don't know about the ltft or stft I don't have access to a scanner at the moment. It throws the code once the tank is low and right after cranking. I'll try to get a charcoal cannister and purgevalve and replace them. The truck is 4000 miles from 200k and it runs and drives great. I just cant stand the cel