Q: Is there a difference in software for a PCM for Flex Fuel Vehicles and Standard Fuel? Mine 1998 FFV 3.3L Dodge Grand Caravan SE

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Dodge dealership mechanic implied there's a software difference but I can't actually get an actual answer to this question. 3 PCMs tried and seems programming is off or something. Car is in shop awaiting yet another PCM because the remanufactured one is turning over engine but not firing. Note, original (even damaged as it is) fires up the car. Mechanic stated the PCM was for Standard Fuel but previously said it checked out correctly with up to date software flashed by reman company.

My car has 310565 miles.
My car has an automatic transmission.

Hi there. To answer your question, yes, the standard fuel PCM will have difference programming than the flex fuel vehicle will. There is a difference in the fuel timing, flow, and injector pulse width among other things. If they are having issues with the installation it is because they are not using the correct PCM or programming. This is common if you are not having this done at the dealer. Trying to do this in an aftermarket environment can be difficult.

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