Digital Tuning Need Help! 97 Gt

[Cupples981]

I have a little bit of a problem. It has to be fuel related because it has a flat spot or hesitation during accel. It shouldn't be a coil problem because its not a COP system. The MSD coils are fairly new.

The codes I have are:
P0135
P1131- 02 indicates lean
P1132- 02 indicates rich (I do sometimes smell it running rich)

I installed a new IAC, MIL eliminators and new spark plugs thinking that would help. No change after that.

Mods include-
BBK Cai
Exhaust cut outs between front and rear 02 sensors
Full exhaust without cats
SVE MIL eliminators
MSD coils

 

[wmburns]

Confirm that the MIL's were installed on the rear O2 sensors (not the front).

Focus first on the P0135 (passenger/front right) O2 sensor. When ever there's a circuit malfunction DTC think, bad/dirty/loose/wet connector, wiring fault, or totally failed/shorted O2 sensor.

IMO, it's possible the other codes are from the P0135. Also would expect the car's power would be down as long as there are any unresolved DTC codes.


>>
P0135 - HO2S Sensor Circuit Malfunction (HO2S-11)

• Short to VPWR in harness or HO2S.
• Water in harness connector.
• Open VPWR circuit.
• Open GND circuit.
• Low battery voltage.
• Corrosion or poor mating terminals and wiring
• Damaged HO2S heater.
• Damaged PCM.