Fuel/Carburetor/Injector Problem

1987 C20 4-wheel drive

Problem more or less is:

Can only be started - occasionally - with gas peddle fully depressed

Flooding badly.

On rare occasions - less and less frequent - runs OK. Exclusively or almost exclusively only if from cold start.

Once from a cold or nearly cold start with air filter off, ran perfectly for about 20 seconds then saw both "injectors" suddenly increase fuel spray by about 5 times normal amount. Engine stalled as typical.

Anyone have and experience or ideas?

Reply to
Al Smith
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Just about everybody with the early TBI systems will eventually run into this. The coolant sensor connector corrodes, making the ECM think it's

40 below outside. The sensor is next to the thermostat housing, and will have a yellow and a black wire into the connector. Pull the connector off and clean it very well.
Reply to
John Alt

Thanks a lot.

I should have come here before I spent about 8 hours and $50.

Reply to
Al Smith

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