Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
1998 Mustang GT mild misfire in 2nd and 3rd gears between 1.5k and 2.5k RPM
98 GT (116.7 K miles) misfires in 2nd and 3rd between 1.5k - 2.5 k RPM when holding throttle constantly. If I floor it through that range, it will be okay.
Things I've replaced before finding Scanner Danner:
Air intake:
MAF
Cleaned the throttle plate
Sealed a few leaks in the cold air intake tube (or whatever you call it)
Replaced the air filter.
Replaced the IAC ( it was leaking and causing bad idle), helped with the idling issues
Ignition:
New Coils
New Wires
New Plugs
Fuel delivery system: Had low fuel pressure at the rail (19 at idle), after replacing the fuel pump, went up to 37 PSI
New Fuel pump assembly
New Fuel filter
Have not touched the injectors
Sensors:
New upstream 02 sensors (had a cod for one of them, helped clear the code)
New engine temp sensor as it seemed to run better through the RPM ranges when the car was warmed up
TPS
How it all started:
One night I went to a car show, parked as usual and turned off the car. When I wanted to leave, the battery had died (everything was switched off), my buddy jump started me and I was on my way.
A couple of mins after leaving, it started misfiring. Back then it felt as if the drive belt was stuck and pulling on the engine (the belt was okay, I just never experienced misfire before)
My car kept dying on me until I reconnected the battery terminals, it seems that either of them was loose).
Prior to the incident I replaced the AC compressor and recharged it. While working on the car, I would sometimes disconnect the battery, and after reconnecting it, my car would drive normally for a while and then it would start misfing? Electric issue?
In the beginning I had P0174 lean/ rich conditions but they disappeared once I replaced the O2 sensors. My CEL also seems to have gone out. I don't if it is connected. I remember taking the dash apart to replace the odometer gears maybe I have damaged the bulb or the wires. Then again if it was on when the codes popped.
Finally fuel trim log is in the attachment if it helps. Any advice would be appreciated. Thanks for looking.
