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Ecm S10

February 27th, 2010 admin

Blazer blowing ECM fuse?

I have a 1986 Chevy s10 blazer, 2.8l V6, 700r4 trans w/4wd. It starts fine, and as long as I putt around it runs all right, but When I try to accelerate hard, the ECMB (10 amp) fuse blows. I can race the engine as much as I want in park or neutral, but in gear, when I gun it, it dies. Could it be a bad TPS? It seems to be a common phantom to deal with, and would appreciate any information.
I found the problem. The wires off the oil pressure sending unit had come off and found their way between the exhaust manifold and the frame. Repaired such, and now its good as gold.

I own a shop, and think this; I will agree with the answer above me on this one. They are bad to blow this fuse when the fuel pump is going out. When you get on the gas pedal, the demand rises, and the pressure drops to a level to make the pump run more often, so if its going bad, the pump gets hot enough, or is shorting out internally to make the fuse blow. Since this is a 10 amp fuse, the pump must be getting pretty hot to blow it. The throttle position sensor wouldn't blow this fuse, as it is not powered off this side of the power supply, and works to ground anyway. Do this; When it blows again, feel the wires that go into the gas tank to see if they feel hot. You can also feel the wires going to the TPS, and you will see what I mean. The fuse you are talking about does blow when there is an issue with the fuel pump, or a short in the harness going back to the tank from the ECM. This system is also wired through the oil sending unit, so you may have to check there as well for any wires shorting to ground.
Glad to help out, Good Luck!!!

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