mustang problems...
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Senior User
Joined: Dec 2003
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From: stillwater, oklahoma
i disconnected all 4 o2 sensors and changed the fule filter, it does not die any more and seems to be running not as rich, the car has good fule pressure, could the pump still have gone bad? also, the car should run ok with the 02 sensors disconnected right?
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Joined: Jul 2002
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From: Long Island USA
The IAC is on the throttle body.
One thing at a time... reconnect the O2 sensors and see if the fuel filter had something to do with it (doubtful).
With the O2 sensors out, the computer is running in open-loop. It doesn't care about lots of sensors, it's just doing the best it can with what the engineers put into it.
So, disconnecting the O2 sensors didn't solve the problem, it just made the computer ignore lots of other things. It's probably not the O2 sensors, it's something else, you just made the computer not care about it
One thing at a time... reconnect the O2 sensors and see if the fuel filter had something to do with it (doubtful).
With the O2 sensors out, the computer is running in open-loop. It doesn't care about lots of sensors, it's just doing the best it can with what the engineers put into it.
So, disconnecting the O2 sensors didn't solve the problem, it just made the computer ignore lots of other things. It's probably not the O2 sensors, it's something else, you just made the computer not care about it
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Before you go to the dealer, did you change any of the temperature sensors?
Sounds like the computer is keeping rich thinking the motor isn't warmed up.
If you had a scan tool, you could check what the computer THINKS is the coolant temp.
Sounds like the computer is keeping rich thinking the motor isn't warmed up.
If you had a scan tool, you could check what the computer THINKS is the coolant temp.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Originally Posted by Miller
no i have not changed any of the temp sensors, and i do not have a scan tool
Get it fully warmed up and take a trip to the local mechanic and see if they can scan it for the current coolant temp. If it's way off, that's the problem.
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