Hello everyone, I recently bought a 94 mustang 3.8l that has a rough idle and no
power until about ~2800 rpm. I already cleaned the
MAF and IAT, replaced the fuel filter (whoever
owned the car previously had the fuel filter on
backwards), checked the spark plugs and plug
wires, and cleaned the throttle body. I was viewing
the data with the car running and the IAT and MAF
seem to be working properly. The throttle position
reads 14.26% closed and 86.23% fully open with the
engine off, and between 14.12% and 14.52% with
the engine idling. It seems to transition smoothly
between ~14% and ~86% with the throttle going
from closed to fully open. The harmonic balancer looks fine and doesn't wobble. The timing advance
reads between 18 and 26 degrees with the engine
idling. The check engine light never comes on, but
every once in a while it'll read three codes: P00<D,
B2TAE, and ROR. Other nonsense codes that have shown are POB88, B2ERR, and DAT. I was wondering first if the
throttle percentages are in the right range, and if
the codes which seem to be nonsense might be an
indication that the PCM is bad or on its way out.
Additional Information:
The fuel flow
rate read between 23-24 cc/min, not sure what that
is in psi and there wasn't an option to change the
unit of measurement. I don't believe it was able to
read the fuel pressure. I had to adjust the screw on
the throttle body to keep the car running with the
IAC unplugged, got it to idle at about 650rpm. EGR
error read at -100% and EGR command at 4.31%.
Timing advance varied between 15 and 18 degrees.
Vacuum pressure read at -12.5psi. The engine load
was at 42% after first starting the engine and
gradually went down to 20% as the engine warmed
up. The engine temperature seemed to read
correctly, and never went higher than about 195(F)
degrees.
power until about ~2800 rpm. I already cleaned the
MAF and IAT, replaced the fuel filter (whoever
owned the car previously had the fuel filter on
backwards), checked the spark plugs and plug
wires, and cleaned the throttle body. I was viewing
the data with the car running and the IAT and MAF
seem to be working properly. The throttle position
reads 14.26% closed and 86.23% fully open with the
engine off, and between 14.12% and 14.52% with
the engine idling. It seems to transition smoothly
between ~14% and ~86% with the throttle going
from closed to fully open. The harmonic balancer looks fine and doesn't wobble. The timing advance
reads between 18 and 26 degrees with the engine
idling. The check engine light never comes on, but
every once in a while it'll read three codes: P00<D,
B2TAE, and ROR. Other nonsense codes that have shown are POB88, B2ERR, and DAT. I was wondering first if the
throttle percentages are in the right range, and if
the codes which seem to be nonsense might be an
indication that the PCM is bad or on its way out.
Additional Information:
The fuel flow
rate read between 23-24 cc/min, not sure what that
is in psi and there wasn't an option to change the
unit of measurement. I don't believe it was able to
read the fuel pressure. I had to adjust the screw on
the throttle body to keep the car running with the
IAC unplugged, got it to idle at about 650rpm. EGR
error read at -100% and EGR command at 4.31%.
Timing advance varied between 15 and 18 degrees.
Vacuum pressure read at -12.5psi. The engine load
was at 42% after first starting the engine and
gradually went down to 20% as the engine warmed
up. The engine temperature seemed to read
correctly, and never went higher than about 195(F)
degrees.
