To find the source of the problem, you'll need to:
1. Get the diagnostic trouble codes (DTCs): This 1985 model likely doesn't have an onboard diagnostic port like later vehicles. You'll need to either use a jumper wire method (consult a repair manual specific to your year and engine for the correct procedure) to read the codes flashing on the Check Engine light or take it to a mechanic with diagnostic equipment.
2. Interpret the codes: Once you have the codes, use a repair manual or online resource (like a Haynes or Chilton manual for your specific vehicle) to decipher what the codes mean. This will tell you which sensor or system is malfunctioning.
3. Locate and troubleshoot the faulty component: After identifying the problematic sensor, you'll need a repair manual to find its location and determine the proper troubleshooting steps. Common culprits include:
* Oxygen sensor (O2 sensor): Usually located in the exhaust manifold or downpipe.
* Throttle position sensor (TPS): Usually found on the throttle body.
* Mass airflow sensor (MAF sensor): (Likely not on a 1985 model, but possible depending on the engine) Located in the intake air duct.
* Crankshaft position sensor (CKP sensor): Located near the crankshaft.
* Various other sensors: A wide array of other sensors could be causing the light to illuminate.
In short, you can't just find one "check engine sensor." You need to diagnose the problem using diagnostic trouble codes. A repair manual specific to your 1985 Chevy S10 Blazer is crucial for this process.
