I’ve created a discussion a long time ago about this truck and I really appreciate the past help, but I’m back for more.
My 2001 Chevy S-10 with a 4.3L V6, has finally decided to bite the dust, but I’ve been trying to revive it. The problem I’m having now is that it is hard to start, but once it does it idles perfectly. Not only this, but while it’s in its “warm up” mode (where it idles at about 950 RPM) the engine will accelerate, hold any RPM and purr like a kitten, but as soon as it gets out of this “warm up” period (where it idles at about 650) the engine will not accelerate. It only spits, sputters, tries to run up and, if I dont back off, will finally die. If I do back off, though, it will return to idle and idle perfectly. Any attempt to press the accelerator again will cause it to spit and carry on like above.
Here’s some additional info: It’s throwing the P0300 “Random-multiple misfire” code. I’ve replaced the following parts: Fuel pump–fuel filter–fuel injection unit (spider)–fuel pressure regulator–coil–distributor cap and rotor–plugs and plug wires. Here’s the things I’ve checked: fuel pressure 50-60psi–spark at the plugs O.K.–borescoped the #1 cylinder and the valves are opening and closing on the correct strokes–removed the catalytic converter and muffler (running open pipes) so there shouldn’t be any blockages–lastly, the throttle position sensor (in accordance with a web-site) it checks out O.K. I’ve also put a hand-held scanner on it and if this strikes your fancy, I’ll provide all the diagnostic readings it gave me.
Any suggestions, direction, advice…or matches? Thanks a million.