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Start/No Start & MAPP Sensor Unplugged
Hi Guys…another newbie with 6.0 problems….my truck is a 2003 F-550 Chassis Cab 4x2 which I purchased in May/2005 with 22K miles on the clock. The previous owner used it for towing a huge 5er.
Besides a six year problem with 1) batteries going dead after 3 days of non-use and in the last two years 2) won’t start nor fire half the time, one day it lost virtually all (95%) engine power. After quite a long process, the local shop found with the MAPP sensor plugged in, it would barely escape it’s own shadow, but with it unplugged, it runs like a John Force Racing F/C, with the only down side being the infamous ‘Check Engine’ light on. A brand new MAPP sensor was put in, but made no difference. After some research, they are getting more confused about why when the MAPP sensor is unplugged, it runs great.
A friend told me that possibly the previous owner had chipped the ECM (Superchip?) and if that tune had been removed before me buying it, some of the performance enhancing files may be creating havoc with the ECM, similar to a computer virus if you may. Are we on the right track with this thinking? So it was suggested to have the ECM completely formatted, then reprogrammed in case some stray aftermart performance data is the culprit. By a friend’s suggestion, I’m thinking of having it done by IH with their tune in the ECM. Thanx in advance.