Limp Home Mode and how to get around it
Hello all. 2005 cinco 5spd currently with 211K miles, owner since 2014 at 128k. Original engine, clutch, transmission, CV shafts and suspension so far.
In case you are unaware, our cars have a limp home mode in the programming, which can be triggered for all sorts of reasons, and it causes the car to high idle, rev limit to 2500 rpm in gear and 4000rpm in neutral, which means essentially 50mph top speed. If you try to exceed 2500rpm, it cuts out the engine until 2000rpm is reached, and then allows it to power back on. Very, Very annoying and potentially dangerous on the interstate. I happened to discover LMH due to a cheap ebay MAF. But I wasn't going to pay $200 for quality MAF, especially since the Ebay MAF otherwise runs fine and gets the same MPG. If the car was going to play dirty, so was I.
I installed a $6 quick battery disconnect and I use it once a week to disconnect the battery for only a couple seconds. For some reason the radio presets and clock still retain memory after the disconnect which is pretty cool. I have figured out the circuit and will eventually install a push button in the car to reset only the ECU on the fly. So far 10k miles without a hiccup.
Next project is installing the custom roof rack built from a ford explorer rack. It always annoyed me that these cars never had a factory rack, so I made one. If anyone is interested in that let me know and I will post a how-to.