other than clear old codes, is there anything you have to do to a replacement passenger side computer to get it to start the car? We have tried THREE and none of them would turn the car over. (two were close matches the 3rd and exact match) Plug my original back in and the car would start. But with fuel pressure that varies from 5-35lbs. I am just sick!!
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1999 Ford Mustang Question: I hate computers in cars!!
Answer #1mastertech6371 December 08, 2010, 11:22Master
aside from what junk yards tell you, you cannot swap computers without re flashing the unit to yours. that is assuming the junkyard unit is anygood.
start at the beginning. what is the no start issue? I see by your fuel pressure readings that there is not enough pressure for it to run. that may be the fuel pump failing.
Do you know if it has any spark??
Reply99MustangOwner, December 08, 2010, 11:36Rookie
My vehicle starts with my computer. BUT while I am driving I lose power and my CHECK ENGINE LIGHT would start flashing at me. I had a friend unhook my battery BEFORE we could check codes. So now MY CURRENT computer will no longer set off my check engine light at all. My repairman put a fuel pressure gauge on and I was getting inconsistent pressure. My spark plugs are also showing signs of lack of fuel. If my computer is not functioning do we still FLASH is though? and how do you flash a computer for a car? They are replacing he fuel pump as I type, but he called to tell me my fuel smelled bad and asked if I was putting E-85 in (which I am not). He is checking to see if there is evidence of someone placing something in my fuel tank also. I have replaced the fuel filter with a brand new NAPA one as well.
Replymastertech6371, December 08, 2010, 12:49Master
ok, we are on the same track. if the fuel smells bad, then now is the time to dump the tank and add new.
a new pump will increase your pressure and it will run better.
the check engine light was telling you a missfire. you need to read the code. clearing it does nothing. the problem is still there. get the code read when it comes on again as when you took off the battery cable you wiped out all the info needed to check the code.
flashing requires a scan tool and a shop with the capability to update your computer info by going to the ford web site and getting the most up to date info. can you do it yourself, no, unless you have the 4000 tool. it costs about 180 to flash it and with the age of your car, it may have several updates.