I recently bought a 1996 12 valve sight unseen with 300k miles. I've been trying to restore it and was told that it had fueling problems. I have replaced all of the fuel lines to the tank, the return overflow valve, the in tank fuel module, and did a filter change. I also changed the oil and replaced a few other things that I seen were messed up.
So the problem I am having now is that I'm getting fuel to all of the injectors, the truck runs, but runs rough. I originally thought that the #3 and #6 injectors were bad because when I cracked the lines, the truck stayed running the same. I had all of the injectors tested and cleaned and they were good so I put them back in while also switching the suspected bad injectors into different holes. The point I'm at now, I know the injectors are good and I'm getting good pressure to all of the cylinders, but there is no combustion going on. I was thinking either the valves were bad or the rings are bad so I'm going to check them. Before I take the head off I will be doing a compression test whenever my compression tools get here. I was thinking that since cylinders 3 and 6 are on the same stroke, could the timing be off? I noticed that whoever had the truck before had cranked the star wheel all of the way, the preboost screw all of the way, and had a #0 fuel plate in the truck, which made me think that they may have tried to adjust the timing. Could the timing be the cause of this? If so I'll order a timing kit and check that as well. Any help or input would be greatly appreciated.
So the problem I am having now is that I'm getting fuel to all of the injectors, the truck runs, but runs rough. I originally thought that the #3 and #6 injectors were bad because when I cracked the lines, the truck stayed running the same. I had all of the injectors tested and cleaned and they were good so I put them back in while also switching the suspected bad injectors into different holes. The point I'm at now, I know the injectors are good and I'm getting good pressure to all of the cylinders, but there is no combustion going on. I was thinking either the valves were bad or the rings are bad so I'm going to check them. Before I take the head off I will be doing a compression test whenever my compression tools get here. I was thinking that since cylinders 3 and 6 are on the same stroke, could the timing be off? I noticed that whoever had the truck before had cranked the star wheel all of the way, the preboost screw all of the way, and had a #0 fuel plate in the truck, which made me think that they may have tried to adjust the timing. Could the timing be the cause of this? If so I'll order a timing kit and check that as well. Any help or input would be greatly appreciated.
