new 4.3L 6cyl in 1995 chevy g20 no power

Asked by Aug 03, 2017 at 02:57 PM about the 1995 Chevrolet Chevy Van 3 Dr G20 Cargo Van

Question type: Maintenance & Repair

i put a new "long block" motor in my 1995 chevy g20 van - it struggles to get up to speed - way less power then the old motor with 189,000 on it - cooling system, alternator, starter, plugs, wires, dist. cap and rotor are new also.  intake and exhaust manifolds were cleaned completely - what else to check?

3 Answers

more detail on the "struggle" - i turn the key and it starts good, idles good, then seems to have way less power at the lower rpms, once it gets to 10mph(in 1st gear) it goes a little better...then shifts, and that is when it feels way weak. if im going uphill at all, or the a/c is on, it wont go any faster. if its on flat ground or downhill, it speeds up really slow(got lots of one finger waves lately in traffic). if i get to 50 mph, it can hold it...until i hit a hill, then slows down(sounds like bogging out) while im still on the gas, until i get to 15 mph, then climb the rest of the hill in 1st gear. feels like im dragging a house, but much more noticable at lower rpms. doesnt misfire, and triple checked timing. the old motor was in bad shape, but didnt have this problem at all


awesome - got it fixed, couldnt have done it without you - wooohooo!

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