What is check engine code 35 mean on a 1993 chevy van with 350 cubic in engine?

There is no standard OBD-I (On-Board Diagnostics I) code 35 across all manufacturers for a 1993 Chevy van with a 350 cubic inch engine. OBD-I systems varied significantly between manufacturers and even between models within a manufacturer.

To find out what code 35 means *specifically for your vehicle*, you'll need to consult:

* Your vehicle's repair manual: This is the most reliable source. It will have a section dedicated to diagnostic trouble codes (DTCs).

* A 1993 Chevy van repair manual specific to the 350 engine: You can often find these online or at auto parts stores.

* A Haynes or Chilton repair manual for your specific vehicle: These are less detailed than the factory manual but still helpful.

Without the correct manual for your specific model, any interpretation of code 35 would be pure speculation and could lead to unnecessary repairs. The code might not even be a standard code. Some systems use a different code number system altogether or use a combination of flashing lights to indicate problems.