X3 1st Flashing Question
#1
X3 1st Flashing Question
So I just got my X3 from Don at Lasota Racing, and I read through the instructions on the "Ask me tuning questions" thread, but it doesn't quite make sense to me. The instructions were as follows:
Flash it with your new tune.
Dis-connect the battery
Headlights on
Ignition on
Wait at least 10 minutes.
Turn everything off
Re-connect the battery.
Start the motor and just let it idle until it reaches at least 170F (or 2-3 minutes if already hot)
Let the idle come down to where you have it set.
Then turn the AC on full blast and let it idle like that for a minute.
If you disconnect the battery, there is no power going to anything. How will this help reset the PCM? So you disconnect the battery, turn the headlight switch on, turn the ignition to "ON", keep it like that for ten minutes, then turn everything off and reconnect the battery? I don't really under stand the whole PCM thing, so maybe I just don't get it? Thanks for your help.
Flash it with your new tune.
Dis-connect the battery
Headlights on
Ignition on
Wait at least 10 minutes.
Turn everything off
Re-connect the battery.
Start the motor and just let it idle until it reaches at least 170F (or 2-3 minutes if already hot)
Let the idle come down to where you have it set.
Then turn the AC on full blast and let it idle like that for a minute.
If you disconnect the battery, there is no power going to anything. How will this help reset the PCM? So you disconnect the battery, turn the headlight switch on, turn the ignition to "ON", keep it like that for ten minutes, then turn everything off and reconnect the battery? I don't really under stand the whole PCM thing, so maybe I just don't get it? Thanks for your help.
#2
So I just got my X3 from Don at Lasota Racing, and I read through the instructions on the "Ask me tuning questions" thread, but it doesn't quite make sense to me. The instructions were as follows:
Flash it with your new tune.
Dis-connect the battery
Headlights on
Ignition on
Wait at least 10 minutes.
Turn everything off
Re-connect the battery.
Start the motor and just let it idle until it reaches at least 170F (or 2-3 minutes if already hot)
Let the idle come down to where you have it set.
Then turn the AC on full blast and let it idle like that for a minute.
If you disconnect the battery, there is no power going to anything. How will this help reset the PCM? So you disconnect the battery, turn the headlight switch on, turn the ignition to "ON", keep it like that for ten minutes, then turn everything off and reconnect the battery? I don't really under stand the whole PCM thing, so maybe I just don't get it? Thanks for your help.
Flash it with your new tune.
Dis-connect the battery
Headlights on
Ignition on
Wait at least 10 minutes.
Turn everything off
Re-connect the battery.
Start the motor and just let it idle until it reaches at least 170F (or 2-3 minutes if already hot)
Let the idle come down to where you have it set.
Then turn the AC on full blast and let it idle like that for a minute.
If you disconnect the battery, there is no power going to anything. How will this help reset the PCM? So you disconnect the battery, turn the headlight switch on, turn the ignition to "ON", keep it like that for ten minutes, then turn everything off and reconnect the battery? I don't really under stand the whole PCM thing, so maybe I just don't get it? Thanks for your help.
#3
#5
#6
wydopnthrtl said to do what the OP posted. The reason behind it was that transmission tweaks were not being re-tuned with just a quick flash. You need to do all of that to clear the capacitors in the pcm for the transmission tweaks to go through. A quicker way to do this would be to touch the negative battery cable to the positive battery terminal which will instantly clear the pcm, however I am not comfortable with that idea so I just do what the OP posted.
Oh and I have noticed that if you do not let it idle up to temp afterwards, it takes a lot longer for the engine to get to stoich or wherever you set the AF ratio.
Oh and I have noticed that if you do not let it idle up to temp afterwards, it takes a lot longer for the engine to get to stoich or wherever you set the AF ratio.
#7
wydopnthrtl said to do what the OP posted. The reason behind it was that transmission tweaks were not being re-tuned with just a quick flash. You need to do all of that to clear the capacitors in the pcm for the transmission tweaks to go through. A quicker way to do this would be to touch the negative battery cable to the positive battery terminal which will instantly clear the pcm, however I am not comfortable with that idea so I just do what the OP posted.
Oh and I have noticed that if you do not let it idle up to temp afterwards, it takes a lot longer for the engine to get to stoich or wherever you set the AF ratio.
Oh and I have noticed that if you do not let it idle up to temp afterwards, it takes a lot longer for the engine to get to stoich or wherever you set the AF ratio.
#9
I ended up flashing the truck without doing all that, and it definitely improved power. I did let the truck idle for 5-10 minutes. I have a 5 speed and the truck is a 2001. I ended up calling Don @ Lasota and he said just flashing it would be fine since I don't have a KAM like older Rangers.
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