* Fuel pump module (low output) Possible
* Engine mechanical problem Not likely
* TPS voltage change not smooth Not likely
* TPS voltage greater than 0.92 volts with throttle closed Not likely, but have your TPS checked at the dealership
* ECT sensor (out of calibration) Very possible, your engine coolant temperature sensor is in direct relation to your fuel mixture. It's on your engine block between the alternator and AC compressor. It's pretty easy to have checked.
* Fuel filter/pressure regulator (low pressure) Possible
* Fuel pump capacity (volume) out of specs Not likely
* MAP sensor (out of calibration) Possible.
Start by checking the ECT and MAP sensors. Next have the fuel pressure checked, followed by the TPS
355 and 357 are circuit codes for the #5 and #7 ignition coils. They have absolutely no bearing on anything but the electrical pulse being sent to the spark plugs. Those two codes, no matter what's setting them off, cannot mean you need a new motor. Start with the spark plugs and work your way back. If your GC is an older model (pre-2004 I think), use Champion Platinum truck plugs. Post-2004 use NGK-R platinum spark plugs. They are what's meant for the motor.Another Jeep GC question (got the codes)...?I would suggest checking into your down stream 02 sensors.
thats the code your throwing.
A good way to check for a bad 02 sensor is the simply swap them to the other side of the car then rescan the computer.
if the cel jumps from bank one to bank2 you know the sensor is bad. good luck.Another Jeep GC question (got the codes)...?I think your P0355 and 357 are you 5th and 7th spark plug. You may have them gapped wrong. Make sure you are not using platinum plugs.
