2G Bought a 2GB GST. Multiple Codes

[redGT]

Hello Everyone!

Just got a 97 GST and it's a bit of a basket case mechanically.

The car doesn't rev clean or hold idle and is throwing the following codes:
P1105-Fuel Pressure Solenoid
P0120-Throttle Position sensor Circuit A
P1400-Manifold Differential Pressure Sensor
P0443-Evap Emission System Purge Control Valve
P1105-Fuel Pressure Solenoid Malfunction

It was suggested that the MPI/MFI relay could be bad causing most of these issues so I ordered one and will have it soon.

Is there anything else I should be looking at?

Thanks

 

[pauleyman]

Have you tried to diagnose any of those circuits?

 

[redGT]

Have you tried to diagnose any of those circuits?

how would i go about doing that?

 

[steve]

how would i go about doing that?

By getting ahold of a factory service manual for your year and testing each. You're going to need the docs to maintain the car going forward.

 

[dustyboner]

97 4g63 MFI_TroubleShooting

97 FSM vol.1&2

 

[redGT]

UPDATE:

I ended up buying a new Throttle Position Sensor, Fuel Pressure Solenoid, Manifold Differential Sensor, and MFI/MPI relay as they all looked original.

Swapped everything in the car and drove it 50 miles yesterday and the car now drives perfectly.

I reset the CEL and am gonna put some more miles on it this week to see where i am in terms of error codes and will report back.

 

[redGT]

97 4g63 MFI_TroubleShooting

97 FSM vol.1&2

Thanks for this. Just downloaded.