Resetting PCM Good or Bad?
Thread Starter
Instructor
Joined: Nov 2008
Posts: 178
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From: Erie CO
Resetting PCM Good or Bad?
I have heard both good and bad about resetting PCM. Anyone who HAS done this what is your take on results.
For those that don't know what this does=
The procedure sets your car's PCM back to it's default fuel trim and timing settings, and sets WOT enrichment back to the high octane table if your car has dropped into the low octane table.....
The car will be defaulted back to it's initial startup, idle, part throttle cruise, and WOT fuel and timing settings.
For those that don't know what this does=
The procedure sets your car's PCM back to it's default fuel trim and timing settings, and sets WOT enrichment back to the high octane table if your car has dropped into the low octane table.....
The car will be defaulted back to it's initial startup, idle, part throttle cruise, and WOT fuel and timing settings.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
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From: Van Buren Arkansas
Wounded Warrior Escort '11
If you do this, let the dealer do it and ask for all of the software updates that are available for your car. Just like computers (which the car's are, just rolling), updates are issued to the software/firmware onboard, but rarely put in.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,822
From: Charlotte, NC (formerly Endicott, NY)
I have heard both good and bad about resetting PCM. Anyone who HAS done this what is your take on results.
For those that don't know what this does=
The procedure sets your car's PCM back to it's default fuel trim and timing settings, and sets WOT enrichment back to the high octane table if your car has dropped into the low octane table.....
The car will be defaulted back to it's initial startup, idle, part throttle cruise, and WOT fuel and timing settings.
For those that don't know what this does=
The procedure sets your car's PCM back to it's default fuel trim and timing settings, and sets WOT enrichment back to the high octane table if your car has dropped into the low octane table.....
The car will be defaulted back to it's initial startup, idle, part throttle cruise, and WOT fuel and timing settings.
In your example if you have been using low octane gas and the computer has adjusted settings (retarded timing, etc) the computer will also change back to correct settings if you start to use high octane gas. There is no need to reset.
If something has changed in the engine the computer will compensate for the changes by adjusting settings within a range of values. Once it has reached the end of its range the computer can no longer compensate and the engine will not run as well. If you reset to original settings the car may run even worse.
Bill
Last edited by Bill Dearborn; Jan 30, 2009 at 12:44 PM.
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That's the easy way to do it.
