99 blazer with no compression in all 6 cylinders
10

Asked by Cory Oct 06, 2020 at 09:06 PM about the 1999 Chevrolet Blazer 4-Door RWD

Question type: Maintenance & Repair

99 Blazer rwd 4.3L v6
I recently replaced the head gaskets and now that I
have it all put back together, it won't start. I made
sure to mark the distributor. I put the push rods in
order in a cardboard box, Tighten the lifters to
spec, tighten all bolts to Haynes manual. I followed
all the manuals steps. So I'm stumped. I checked
the fuel rail and it's getting fuel. So I believe its
compression. Any help would be extremely useful.
(Edit)
So I am getting spark. hooked it up to a spark plug
tester. So that's good. I rented a compression
tester. So far I checked all six cylinders and have
no compression at all. 0. So what could cause 0
compression on all cylinders... someone I asked
said it cod be blown piston rings. But could all 6
piston rings be blown at once ? Also could It be the
distributor not lined up to top dead center?

5 Answers
101,595

KenF answered 3 years ago

The timing is off. You should look at the timing belt and make sure that is ok. A bad head gasket and cause LOW compression, but NO compression is timing related.

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10

Cory answered 3 years ago

Ok, also I was told maybe the distributor might be slightly off, could that be a possibility ?

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101,595

KenF answered 3 years ago

zero compression in all cylinders would likely be cam timing, it may be the timing chain jumped. To have 0 compression across the board means the intake and exhaust valves are out of sequence or something is preventing them from closing completely. I would first however open the valve cover and make sure the valves are opening and closing when they should. Compare the new pushrods to the old ones, valve stems, springs, etc. The distributor being misaligned will throw off spark, but the engine would still make compression.

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10

Cory answered 3 years ago

Ok, I removed the valve cover on the driver side, and the valves are opening and closing.

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10

Cory answered 3 years ago

I went ahead and removed the distributor and set the motor to top dead center.made sure the lines matched up. Re installed the distributor so it waa firing on the first cylinder. Put it all back together. It sound a little better. Now It sounds like I'm getting compression on a couple cylinders.

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