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Re: 91 GMC K1500 Won't Start
The coolant switch near the exhaust manifold is only for the gauge. The coolant temp sensor for the ECM is in the intake manifold near the tstat housing.
You could try unpluging the coolant temp sensor and try to start it. With it unpluged, the ECM will think the engine is cold and give it more fuel.
The pickup coil in the dist could be bad. Ignition module is another possibility.
Check that the vacuum hose the MAP sensor is good. My 90 will not start if the hose is disconnected.
//2000CAYukon
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