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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)
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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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