Reinstalling a tune vs disconnecting the battery - Ford Mustang Forum
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post #1 of 4 (permalink) Old 09-03-2010 Thread Starter
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Location: Wildwood
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Reinstalling a tune vs disconnecting the battery

Is there a difference between re-installing a tune you already have vs. disconnecting the battery to reset the ECU? Are there benefits to resetting the ECU by disconnecting the battery vs reinstalling an existing tune.

For ex. If my RPMs are a little erratic and I reinstall my tune and the problem still exists can resetting the ECU by disconnecting the battery correct the issue?

The tune has been in use for a while with no issues but the RPM issue began after switching back from an 87 tune to a 93 tune.

92 LX
Holly Systemax, Shorty Headers, TFS Stage 1 Cam, TFS FAC 170 Heads, Cobra Transmission, King Cobra Clutch
RWHP 317

2006 Mustang GT
JLT CAI and a Custom Tune
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post #2 of 4 (permalink) Old 09-03-2010
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I prefer to do a reinstall of the tune, but I genrally have my battery disconnected at some point every month due to working on the car anyway.

Forged bottom end, Ported heads, Saleen super charger, 2.8 blower pulley/15psi, Dual stage water to air intercooler, AFCO heat exchanger, battery relocated, Twin GT500 fuel pumps, T-56 trans, Aluminum flywheel, Aluminum driveshaft, 3.73 rear gears, Eaton TruTrac Diff, TA Performance rear end girdle, Racecraft suspension system, UCA, LCA, panhard bar, 15" slotted front rotors w/ 6 piston calipers, Carbon Fiber front splitter/rear diffuser, and bunch of other stuff
RWHP/RWTQ is adequate
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post #3 of 4 (permalink) Old 09-03-2010
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Have you ever cleaned your MAF sensor? That may be your problem.
CRC makes a spray cleaner you can get at auto stores.

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post #4 of 4 (permalink) Old 09-03-2010
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Re-installing a tune won't clear the KAM (Keep-Alive-Memory) settings that your computer has learned. I have the Moates QH, and both it (and the Tweecer guides) recommend a battery-disconnect reset of the stock computer when you make changes to fueling so that the car can more rapidly re-learn its settings. There's also a clear-KAM-settings tune that you can create (a single flag in the binary) which you write temporarily, and then over-write with a running tune.
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