Does anyone know anything about flashing the ECM? -
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Go Back > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Does anyone know anything about flashing the ECM?

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Unread 01-12-2005, 11:07 AM   #1
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1992 YJ Wrangler 
Join Date: Oct 2004
Location: Western New York
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Does anyone know anything about flashing the ECM?

Does anyone know where or if there are programs to flash the ECM with? I'm just wondering what kind of programs they have for Jeeps. My friend has one for his truck, and it improves his gas mileage greatly. He can re-flash it and then the fuel consumption is set up better for racing. I'm just curious if there is one for Jeeps.

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Unread 01-19-2005, 12:06 AM   #2
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Back when I was trying to decide whether or not to buy a performance PCM, I read an article about flashing the PCM on Jeeps, but I cannot find it now. IIRC it was not something that the average consumer could perform. It required installing a socket on the board, so the chip could be removed, and a socket (with attendant hardware/software to flash the chip. I never did come across anything that would allow modification of the PCM's programming while in use.
Black 1996 5.2L ZJ Limited
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Unread 01-19-2005, 01:03 AM   #3
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if i were you i would not mess with the diagnostics of such an intricately designed system. The air/fuel curves are set at a certain ratio for a purpose. If you have the V8 the mopar performance PCM is about your only bet. The Jet chips for 4.0 and V8 grands are another option but over time the curve weans itself back to stock setting, dont ask me how but thats what I've heard EVERYONE say that has got a Jet chip.
1998 ZJ - 36's & bent unibody - RIP
2004 WJ - Expedition build
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Unread 01-22-2005, 12:01 PM   #4
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1999 TJ Wrangler 
Join Date: May 2004
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working for a jeep dealer in service, I would say dont do it,
I have asked the techs the same ? and they say yah you can mess with it, but its not worth it, your better off doing engine mod's instead
good luck
Jeep Chrysler Dodge services advisor 9yrs,, OUCH,
95zj, 3"skyjacker, 33"bfg a/t, custom front bar, HELLA 500's
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