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Old 04-26-2012, 11:37 AM
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My TBI is recieving way too much fuel.

I have a 1991 S-10 Blazer 4x4. and I recently had it put in my buddy's shop but I'm doing the work on it myself, I've recently Fixed the timing and Exhaust leak, but it still wouldnt crank, i watched the Throttle body while a buddy was turning it over, and its pouring way too much fuel inside the throttle body, when i unplug the injectors it cranks an idles fine till the fuel already in the engine runs out, i plug the injectors back in and it turns over and cuts immediately back off. Then it wont crank until i unplug the injectors again. Any idea whats going on?

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Old 04-26-2012, 05:38 PM
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Perform a fuel pressure test.
Then look at a live datastream with the engine cold and the key on engine off. See what the coolant sensor is doing.If it is at -40 degrees then it is faulty and will cause excessive fueling.
If you dont have a scanner, then maybe you could plug one in just to see if that helps.pretty common issue with those.
Dont rule out excessive fuel pressure (blocked return line)
Fact is stranger than Fiction
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Old 04-26-2012, 06:45 PM
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Thanks A lot, i'll definately check those out! I would have never thought that a coolant sensor would cause that but then again I'm no master mechanic. I really do appreciate it though
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