Bad battery cause misfires?
07-12-2015, 11:01 PM
#1
Senior Member
Thread Starter
Bad battery cause misfires?
i had a strange incident today. Truck started fine, went to the gas station, filled up got in to turn on truck, and it took three tries. Just didn't want to work.
Finally started it up, turned on Torque/OBD and it registered 24 misfires between three cylinders! Drove anyway (had to get somewhere), and only registered one in them next 30 minutes.
No more misfires the rest of the day...so I am wondering, if the battery is not good, not getting a good charge or dissipating over night, could this cause misfires?
Cops are new.
Finally started it up, turned on Torque/OBD and it registered 24 misfires between three cylinders! Drove anyway (had to get somewhere), and only registered one in them next 30 minutes.
No more misfires the rest of the day...so I am wondering, if the battery is not good, not getting a good charge or dissipating over night, could this cause misfires?
Cops are new.
07-13-2015, 05:21 AM
#4
Moderator (Ret.)
Until the engine fires over enough for the alternator to start charging back the battery, the COP's are getting their voltage from the battery. If it is/was weak during cranking the engine, then sure, the COP's voltage would be low, and possibly indicate a misfire.
Have you had the battery tested? The alternator?
Have you had the battery tested? The alternator?
07-13-2015, 09:32 AM
#5
Senior Member
Thread Starter
No, I haven't had the battery or alternator tested. Pulled a small trailer over the mountains recently, and racked up a ton of misfires on the OBD, no engine light, but my Torque program was going nuts.
So I ordered Accels and changed out the cylinders that indicated the worst misfires, just to see if that would change things...see the misfires float. Sometimes it is cylinder 1, sometimes 3, sometimes 2, 5, 6...but usually no more than 1 indicated misfires per 30 minute commute (which I deem small considering the thousands of revolutions the pistons make in that span)...so to get 24 on startup was an eyebrow raiser. Of course I am worried about the catalytics too. FPDM is new style, less than 20 k miles.
I thought the battery when I had a hard time starting up at the gas station...battery also is probably more than 5 years old, at least.
I know I can get battery checked at local auto parts store, can they check the alternator too?
So I ordered Accels and changed out the cylinders that indicated the worst misfires, just to see if that would change things...see the misfires float. Sometimes it is cylinder 1, sometimes 3, sometimes 2, 5, 6...but usually no more than 1 indicated misfires per 30 minute commute (which I deem small considering the thousands of revolutions the pistons make in that span)...so to get 24 on startup was an eyebrow raiser. Of course I am worried about the catalytics too. FPDM is new style, less than 20 k miles.
I thought the battery when I had a hard time starting up at the gas station...battery also is probably more than 5 years old, at least.
I know I can get battery checked at local auto parts store, can they check the alternator too?
Last edited by Prof; 07-13-2015 at 09:34 AM.
07-13-2015, 10:01 AM
#6
Moderator (Ret.)
No, I haven't had the battery or alternator tested. Pulled a small trailer over the mountains recently, and racked up a ton of misfires on the OBD, no engine light, but my Torque program was going nuts.
So I ordered Accels and changed out the cylinders that indicated the worst misfires, just to see if that would change things...see the misfires float. Sometimes it is cylinder 1, sometimes 3, sometimes 2, 5, 6...but usually no more than 1 indicated misfires per 30 minute commute (which I deem small considering the thousands of revolutions the pistons make in that span)...so to get 24 on startup was an eyebrow raiser. Of course I am worried about the catalytics too. FPDM is new style, less than 20 k miles.
I thought the battery when I had a hard time starting up at the gas station...battery also is probably more than 5 years old, at least.
I know I can get battery checked at local auto parts store, can they check the alternator too?
So I ordered Accels and changed out the cylinders that indicated the worst misfires, just to see if that would change things...see the misfires float. Sometimes it is cylinder 1, sometimes 3, sometimes 2, 5, 6...but usually no more than 1 indicated misfires per 30 minute commute (which I deem small considering the thousands of revolutions the pistons make in that span)...so to get 24 on startup was an eyebrow raiser. Of course I am worried about the catalytics too. FPDM is new style, less than 20 k miles.
I thought the battery when I had a hard time starting up at the gas station...battery also is probably more than 5 years old, at least.
I know I can get battery checked at local auto parts store, can they check the alternator too?
Also, 5 years is a long time for an automotive battery. After a new battery is installed, it begins its path to life expectancy. 5 years was good, but very close to its life span.
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gone postal (07-14-2015)
07-13-2015, 10:05 AM
#7
I had an '09 with original 5 year old battery that started intermittent misfire, COL and would sometimes rough idle. I knew the battery was coming due so I replaced it. All of the other problems disappeared.
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07-14-2015, 08:35 AM
#8
Senior Member
Thread Starter
Read on Rockauto what to do with a multimeter, and I am going to try that...my truck has been off for a couple of days, and so it will let me know what is going on.
Stay tuned.
Stay tuned.
07-14-2015, 10:28 AM
#9
LightningRod
@Prof
I note that you make use the Torque Pro App (a phenomenal tool in my opinion). I have spent extensive time researching & hacking the OBDII system on my '04 5.4L 3v with the Torque Pro App. In addition to the standard misfire counts - I have uncovered and identified descriptions of the following unpublished PIDs from a Torque Scan of the 200+ possible PIDs on the 5.4L. The following PIDs maintained by the ECU relate to your misfire problem and might help make more sense of causes. As you know, you can add custom PIDs for any of them and create custom gauges but have to work out formulas - as I have not done so for these yet.
Cmd: 2216d3 response:6216D30A48 . MFF RPM 16D3 Engine RPM at time of Misfire RPM
Cmd: 2216d4 response:6216D411F4 . MFF LOAD 16D4 Engine Load at time of Misfire %
Cmd: 2216d5 response:6216D500 .. . MFF VS 16D5 Vehicle Speed at time of Misfire km/h mph
Cmd: 2216d6 response:6216D638 .....MFF IAT 16D6 Intake Air Temp at the time of Misfire Degrees
Cmd: 2216d7 response:6216D70005 .MFF SOAK 16D7 Engine-Off Soak Time at time of Misfire Minutes
Cmd: 2216d8 response:6216D8FF.... MFF RNTM 16D8 Engine Running Time at time of Misfire Minutes
............16d9 .................16d9 ........MFF EGR 16D9 EGR DFPE Sensor at time of Misfire Volts
Cmd: 2216da response:6216DA2307 MFF TP 16DA Throttle Position at time of Misfire Volts
Cmd: 2216dc response:6216DC0000 MFF T CNT 16DC Number Drive Cycles at time of Misfire (at least 1 for 1000 Rev)
Cmd: 2216dd response:6216DD01... MPLRN 16DD bit 0 Misfire Wheel Profile Learned in KAM YES=1/NO=0
.................................................. ..MFF PNP 16DD bit 1 In Drive at time of MisFire YES=1/NO=0
If you find them worthwhile, I will share my methodology for working out formulas.
Good luck
I note that you make use the Torque Pro App (a phenomenal tool in my opinion). I have spent extensive time researching & hacking the OBDII system on my '04 5.4L 3v with the Torque Pro App. In addition to the standard misfire counts - I have uncovered and identified descriptions of the following unpublished PIDs from a Torque Scan of the 200+ possible PIDs on the 5.4L. The following PIDs maintained by the ECU relate to your misfire problem and might help make more sense of causes. As you know, you can add custom PIDs for any of them and create custom gauges but have to work out formulas - as I have not done so for these yet.
Cmd: 2216d3 response:6216D30A48 . MFF RPM 16D3 Engine RPM at time of Misfire RPM
Cmd: 2216d4 response:6216D411F4 . MFF LOAD 16D4 Engine Load at time of Misfire %
Cmd: 2216d5 response:6216D500 .. . MFF VS 16D5 Vehicle Speed at time of Misfire km/h mph
Cmd: 2216d6 response:6216D638 .....MFF IAT 16D6 Intake Air Temp at the time of Misfire Degrees
Cmd: 2216d7 response:6216D70005 .MFF SOAK 16D7 Engine-Off Soak Time at time of Misfire Minutes
Cmd: 2216d8 response:6216D8FF.... MFF RNTM 16D8 Engine Running Time at time of Misfire Minutes
............16d9 .................16d9 ........MFF EGR 16D9 EGR DFPE Sensor at time of Misfire Volts
Cmd: 2216da response:6216DA2307 MFF TP 16DA Throttle Position at time of Misfire Volts
Cmd: 2216dc response:6216DC0000 MFF T CNT 16DC Number Drive Cycles at time of Misfire (at least 1 for 1000 Rev)
Cmd: 2216dd response:6216DD01... MPLRN 16DD bit 0 Misfire Wheel Profile Learned in KAM YES=1/NO=0
.................................................. ..MFF PNP 16DD bit 1 In Drive at time of MisFire YES=1/NO=0
If you find them worthwhile, I will share my methodology for working out formulas.
Good luck
Last edited by F150Torqued; 07-14-2015 at 10:32 AM. Reason: added periods trying to align table !!!
