help with chevy truck

[Ed Wright]

Originally Posted by Jim Woods

I have a very nice 1995 tahoe and I started having problems upon acceleration. I changed plugs, wires, rotor and cap also fuel filter, no help. the local garage said o2 sensor, no helpI changed fuel pump, fuel reg in TB and TPS sensor, still no help, egr valve and spark controller in distributor. no help, today i changed timing gears and chain, started up but when I went to unplug wire to set timing the engine stops . I 'm lost can anyone help?

Jim, check the shaft in the distributor for weak magnets. To do that just hook up your timing light, unplug that tan wire, and fire it up. Someone may have to sit inside and keep it runing for you. At idle the timing should be at Zero (TDC), rev it up to 2500 RPM. By 2500 the timing should jump up ten degrees. Won't be gradual, it will jump. If it does not advance, or even retards slightly, you need a new shaft in the dist. Don't go to Autozone,O'Reiley's, etc, for a reman distributor. Go to the GM dealer to buy a shaft, and pray it is still available. I used to keep three or four of those things on the shelf. Also causes stalling at idle when shifted into Drive, or Reverse. Most did it worse going into Reverse, but don't ask me why. Watch the dimple in the gear, it is supposed to align with the rotor blade. Knock the pin out, pull the gear, turn the distributor upside down and spray Berryman's Chemtool B12 down inside the housing, around the shaft. Let it sit a while and the shaft should slide out. Going to make a mess, so don't do it anyplace clean. Knock the shaft out and you will usually break the distributor housing.
Good luck, Ed