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Trumpeter Extraordinaire
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Here's some info regarding the P1131 code, from the 1994 PC/ED manual:

H40 DTCS 1131, 1151, 1132 AND 1152: DETERMINE CAUSE OF UPSTREAM HO2S(S) NOT SWITCHING. DTCS 1130 AND 1150: HO2S NOT SWITCHING FUEL SYSTEM AT THE ADAPTIVE LIMITS (RICH OR LEAN).

* Diagnostic Trouble Codes (DTCs) 1131 and 1151 indicate the system is correcting RICH for an overly LEAN condition. HO2S voltage less than .45 volts.
* DTCs 1132 and 1152 indicate the system is correcting LEAN for an overly RICH condition. HO2S voltage greater than .45 volts.
* DTCs 1130 and 1150 indicate the fuel control system has reached its maximum compensation for a lean or rich condition.

* Possible Causes:

* Fuel System
o Excessive fuel pressure.
o Leaking fuel injector(s).
o Leaking pressure regulator.
o Low fuel pressure.
o Plugged injector(s).

* Induction System
o Air leaks after MAF.
o Vacuum leaks.
o Restricted air inlet.
o PCV system.

* Base Engine
o Oil over fill.
o Cam timing.
o Compression.

* Ignition
o Coil and secondary side of ignition system.

I read through the testing procedure (rather long test!)...oxygen sensors are what you end up testing after ascertaining all other things listed are ok.


Regarding the P1443 code:

From the 1995 Service Manual:

Continuous Diagnostic Trouble Code (DTC) P1443 can be initiated by an IAC valve speed error sometime during vehicle operation. If a Continuous DTC P1507 is received with the DTC P1443 in Self-Test, GO directly to Pinpoint Test Step KE30 .

Continuous Diagnostic Trouble Code (DTC) P1443 indicates an Evaporative Emission System - vacuum system, Canister Purge (CANP) solenoid (mechanical) or Vapor Management Valve (VMV) (mechanical) Malfunction.

Possible causes:

Damaged or blocked carbon canister.
Pinched, plugged, blocked, cracked, cut or disconnected fuel vapor tubes/hoses between the carbon canister, Canister Purge (CANP) solenoid, Purge Flow (PF) sensor, Vapor Management Valve (VMV) and the engine intake manifold.
Damaged CANP solenoid.
Damaged PF Sensor.
Damaged VMV.
CANP, VMV, or PF circuit shorted to VPWR.
Note: Fuel saturation of carbon canister cannot be effectively checked by the canister weight or intensity of odor (smell). Engine must run over an extended period of time to purge fuel (vapor) build-up in carbon canister.


Try a search here on those codes, and read about what others have done to correct them.
 
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