1989 S10 Blazer miss

L8ndeb · 2005-05-16T06:18:57+00:00

Hello All,I've got a 1989 S10 Blazer 4x4, 4.3L, auto, TBI, with approx. 175Kmiles on it. Last week, my wife, on her way to work, ran over a rock.Since then, the engine has developed a miss. I'm not saying the causeof the miss was hitting a rock, but I thought it might be relevant. Themiss is especially noticeable under a load.I have tested the coil and distributor pickup, both are OK. The vacuumtube where the PVC valve attaches to the bottom ot the TBI was clogged.Cleaned that and now have vacuum there. Replaced the PVC valve and aircleaner just because it was time. This week I'll replace the plugs,check plug wires, and throw a bottle of Techron in the tank. Nothing sofar has eliminated the miss.I need help with this. What is the next thing(s) I should be checking?EGR? IAC? Would LOW back pressure cause this? (I found the muffler wasloose where it attaches to the cat.)By the way, there is no service engine light illuminated (bulb works).I have not checked for codes because of this.Any help appreciated and welcome. TIA Leyton at Tahoe

May 16, 2005 21 Replies

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Bret Chase 21 years ago

if the s10 is like the full size, the fuel pump fuse is in the engine compartment next to the fuel pump relay, under a plastic cover.

-Bret

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bobby swift 21 years ago

The fuse is 10 amp ecm located in the fuse panel near the emer.brake pedal. Bobby

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