* Incorrect installation: The most likely culprit. Double-check *everything*. Did you:
* Connect all the connectors securely and correctly? Loose or incorrectly seated connectors are a common source of problems.
* Ensure the MAF sensor is properly seated and functioning? A faulty MAF can trigger codes related to fuel and air mixture.
* Properly ground the new computer? A poor ground can cause all sorts of erratic behavior.
* Verify the new relay is the correct part? Using the wrong relay could cause issues.
* Check all fuses related to the fuel system and the computer.
* Underlying problem: The codes might not be caused by the replacement but reveal a pre-existing issue that was masked or exacerbated by the replacement. The old computer might have been compensating for a problem in another system, and now that it's replaced, that problem is more apparent.
* Damaged wiring: During the replacement process, you might have accidentally damaged some wiring harnesses. Carefully inspect all wiring related to the MAF sensor, fuel system, and the computer for any cuts, shorts, or loose connections.
* Faulty replacement parts: While less likely, it's possible the new computer or relay is defective.
Code Breakdown (assuming a standard GM OBD1 system):
* Code 54 (often): This usually indicates a problem with the Throttle Position Sensor (TPS). It's a common problem on older vehicles. A faulty TPS can cause erratic idle, poor performance, and set various codes, including possibly 54.
* Code 34 (often): This often points to an issue with the Oxygen Sensor (O2 sensor). A bad O2 sensor prevents the computer from accurately adjusting the air-fuel mixture.
Troubleshooting Steps:
1. Recheck all connections: This is the single most important step. Go through every connection related to the MAF, TPS, O2 sensor, fuel system, and the computer.
2. Visual inspection: Look for any damaged wiring or connectors.
3. Test the TPS and O2 sensor: Use a multimeter to test the voltage output of these sensors. You'll need a repair manual to find the proper testing procedures and voltage specifications.
4. Check for vacuum leaks: Vacuum leaks can also affect the air-fuel mixture and trigger codes like 34.
5. Verify the fuel pressure: Low fuel pressure can also contribute to air-fuel mixture issues.
Without knowing the exact definition of codes 54 and 34 for your specific 1989 Camaro (some variations exist), a repair manual is essential. It will provide the pinouts for testing the sensors and give you the precise meaning of the trouble codes. A scanner capable of reading OBD1 codes will also be very helpful.
