You can set the timing but the ecm, engine control module will reset it back to specs. So it useless to try. Good luck dont forget to rate
You have to unplug set timing wire under hood or dash , ecm acts as an advance , 20 degrees back or forward but timing should be placed at spec , if you check timing with wire still plugged in it will jump around due to constant advance or retardation
SOURCE: I have a 1994 GMC 1500 Sierra with 350 engine 5.7
The timing (base), is 0 degrees before tdc. Keep in mind the timing connector must be unplugged. usually a brown wire with a black tracer, has a single connector, located under glove box, or by distributor. Thanks...
SOURCE: 93 gmc sierra heater not working
THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER
SOURCE: 93 gmc sierra running rich no computer codes
Oxygen sensor[s],map sensor and fuel pressure regulator.Although you should have a check engine light "on" with any sensor malfunction.I would look at fuel lines for a leak under vehicle.
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