Ja, Einar du verkar ha jobbat hårt och satsat en del pengar redan för att försöka lösa problemet. Med all tid och pengar du lagt ner på detta så borde du ha fått i belöning att problemet var löst.
Skrev följande fråga på nätet “1986 Camaro TPI engine is running rich” och fick nedanstående svar, samt länk till en video (svaren är dock från AI).
Men du har väl säkert kollat all de punkter som listas upp nedan…
———————————————————————————————————
A 1986 Camaro TPI (Tuned Port Injection) engine running rich often stems from a failed Mass Air Flow (MAF) sensorleaky fuel injectors, or a stuck fuel pressure regulator.
Common symptoms include “eye-burning” exhaust, black smoke, and poor fuel economy.
Key, immediate checks include unplugging the MAF to see if performance improves and checking for fuel leaks in the vacuum line of the pressure regulator.
Top Causes for 1986 TPI Rich Condition:
Mass Air Flow (MAF) Sensor: The 1986 MAF sensor design is prone to failure. A faulty MAF can cause the ECM to miscalculate air intake and dump excessive fuel. Troubleshooting: Unplug the MAF sensor; if the car runs better (likely in limp mode), the MAF is likely bad.
Fuel Injectors: Stock Multec injectors are notorious for failing, causing them to stick open and “dump” fuel, or failing completely.
Fuel Pressure Regulator: A ruptured diaphragm in the fuel pressure regulator can feed fuel directly into the vacuum line, overloading the engine.
Troubleshooting: Check the vacuum line to the regulator for raw fuel.
MAP Sensor/Vacuum: If the engine has a vacuum leak or low vacuum, the MAP sensor may tell the computer to enter a high-load, high-fuel map.
Coolant Temp Sensor: If the sensor fails, it can trick the computer into thinking the engine is constantly cold, keeping it in open-loop “cold start” mode, which adds extra fuel.
Oxygen (O2) Sensor: A lazy or failed O2 sensor can cause the ECM to incorrectly richen the mixture.
Diagnostic Steps
Check Spark Plugs: Pull spark plugs to identify which cylinders are burning rich (plug will be dry/black) or if all are affected.
Check Fuel Pressure: Test the fuel pressure to ensure the pump is not overloading the rail. Ensure the pressure is within spec (\(35-45\) PSI for most ’86 TPI).
Check Vacuum Lines: Ensure all vacuum lines are connected to prevent erroneous sensor readings (MAP/ECM).
Scan for Codes: While 1986 OBD1 systems are basic, they can flag sensor errors.
Exhaust Leaks: A leak near the O2 sensor can introduce oxygen into the exhaust stream, making the computer think the engine is running lean, leading to increased fuel dumping.
Ja, Einar du verkar ha jobbat hårt och satsat en del pengar redan för att försöka lösa problemet. Med all tid och pengar du lagt ner på detta så borde du ha fått i belöning att problemet var löst.
Skrev följande fråga på nätet “1986 Camaro TPI engine is running rich” och fick nedanstående svar, samt länk till en video (svaren är dock från AI).
Men du har väl säkert kollat all de punkter som listas upp nedan…
———————————————————————————————————
A 1986 Camaro TPI (Tuned Port Injection) engine running rich often stems from a failed Mass Air Flow (MAF) sensorleaky fuel injectors, or a stuck fuel pressure regulator.
Common symptoms include “eye-burning” exhaust, black smoke, and poor fuel economy.
Key, immediate checks include unplugging the MAF to see if performance improves and checking for fuel leaks in the vacuum line of the pressure regulator.
Top Causes for 1986 TPI Rich Condition:
Stock Multec injectors are notorious for failing, causing them to stick open and “dump” fuel, or failing completely.
A ruptured diaphragm in the fuel pressure regulator can feed fuel directly into the vacuum line, overloading the engine.
Troubleshooting: Check the vacuum line to the regulator for raw fuel.
If the engine has a vacuum leak or low vacuum, the MAP sensor may tell the computer to enter a high-load, high-fuel map.
If the sensor fails, it can trick the computer into thinking the engine is constantly cold, keeping it in open-loop “cold start” mode, which adds extra fuel.
A lazy or failed O2 sensor can cause the ECM to incorrectly richen the mixture.
Diagnostic Steps
Pull spark plugs to identify which cylinders are burning rich (plug will be dry/black) or if all are affected.
Test the fuel pressure to ensure the pump is not overloading the rail. Ensure the pressure is within spec (\(35-45\) PSI for most ’86 TPI).
Ensure all vacuum lines are connected to prevent erroneous sensor readings (MAP/ECM).
While 1986 OBD1 systems are basic, they can flag sensor errors.
A leak near the O2 sensor can introduce oxygen into the exhaust stream, making the computer think the engine is running lean, leading to increased fuel dumping.
This video shows how to diagnose a running rich condition by checking for vacuum leaks:
https://www.youtube.com/watch?v=TDbRw-xEtyI&t=809
————————————————————————————————————