1995 Chevrolet G-20 van, TBI 5.7L engine, 198k miles, no start condition.
Wondering if anyone has encountered something similar here, this one is a
puzzler. I bought the van not running, seller said it just wouldn't start one
day, Engine cranks over fine but shows no signs of fire at all on any
cylinders, even with starting fluid.
What I have checked/know:
1. Distributor does rotate. Resistance checked cap, rotor, & wires.
2. Engine has great spark at the spark plugs when cranking.
3. No unusual noises while cranking, no oil & water mixed in oil pan or
radiator.
4. There is fuel getting to the throttle plates, it does look weak, but if that
was the issue, starting fluid would have fired it off, or at least made a few
cylinders pop.
I'm starting to question if maybe it has jumped a tooth on the timing chain,
but there is no backfiring/popping as I would expect with un-burnt fuel in the
intake & exhaust system. Anyone have any thoughts on this?
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I had to recharge the battery (it has sat for a few months), I will be doing a compression test tonight. I can add that I did put the engine on the timing mark & confirm that the distributor rotor was in the correct position, so timing has not jumped.
Well, I believe I've found the problem. It needs a new engine. After pulling the plugs to do a compression test, I discovered cylinder 7 was the only cylinder that did not have coolant in it. Since it has sat that way for months, its good and rusty in them too, so it has to be rebuilt or replaced.
Yeah, I was thinking the same thing about a van, but this job is actually going pretty easily... The engine was definitely toast once i got the heads off for a good look. I pulled the passenger front chair, and the doghouse actually has good room around the opening to easily get to everything. The front support is a bolt on, unlike the early welded ones, it looks like GM figured it out pretty well (for once). Now having it down to a short block, there is a ton of room to operate a hoist in, the new engine will go in as a short block & final assembled in-frame. Since the trans looks to be original & fluid smelled/looked burnt, dip stick had evidence of moisture, pulling that to rebuild too. 198K is a pretty good run for a GM auto trans, but its at end life with this mileage. This van is going to be making long interstate camping trips and I want it reliable.
