Re: 95 blazer engine failure

On Jun 29, 10:58 pm, dahpater <dahpa...@xxxxxxxxx> wrote:
Given a few hours, the gas will evaporate past any open valves *and*
leak past the rings. The reason it spins momentarily then locks up
again on each additional start attempt is because the fuel pump gets
energized each time the key is turned to start, which blasts fuel past
the failed CPI unit into the cylinders.

Anyway, there's reason enough to stop cranking the engine all together
until the cause of the (most likely) hydrolock is repaired.

Toyota MDT in MO

Yes gas will keep going into a cylinder, but Hydro lock is a result
off 1 or more cylinders having fluid in them and that/those cylinders
being on the "compression stroke". The valves are "closed". Other then
slight seepage past the rings, (leak down), there isn't any way for
the fluid to get out, without giving the fluid a relief opening.

It "gets out" over the course of a few hours as previously detailed.

If there's that much gas in the cylinder, it will not evaporate in a
short amount of time. (>Given a few hours...<)

It has, it does, and will continue to do so. The amount of gas
required to hydrolock a cylinder is surprisingly small. It doesn't
require the volume of the squish area to accomplish this, just a few
extra unexausted squirts from an injector. Fuel will leak into the
crankcase past static rings, especially worn ones. This is a good
reason for an oil change after this Blazer is fixed.

There isn't any way for
air to get to the gas in the cylinder that is on a compression stroke.
You don't want to turn the engine over with the starter. You then take
the chance of bending a valve.

Actually, you will bend a rod or crack a piston at the pin boss, not
bend a valve. I never said continuous cranking attempts was smart. I
was explaining why the car would crank again after a short time, then
would seize again within seconds -- for the OP's benefit to learn what
is going on.

Most

Most indeed.

Toyota MDT in MO

.

Relevant Pages

  • Re: Could this be done? (engine mod, remove two pistons)
    ... It takes a certain amount of fuel burned to create sufficient power to ... Four cylinders will use a certain amount of fuel per cylinder to move ...
    (rec.autos.tech)
  • Re: Rotating Injectors Among Cylinders
    ... > "Coke bottle test" until he got all the injectors to put out the same ... > amount of fuel. ... > What you want is the fuel/air mixture to be the same for ALL cylinders. ... induction air through a longer path than the rear cylinders and therefore ...
    (rec.aviation.owning)
  • Re: Center gauge
    ... If the male thread is on the ... internally threaded them to fit the ends of the cylinder. ... used to test the rings. ... The only difference in the cylinders was slight ...
    (rec.crafts.metalworking)
  • Re: Engine opened after 380000km, Picture Gallery!!! (was: Oil consumption puzzle)
    ... It was the RINGS. ... So the oil consumption was caused by too much oil coming up between ... discussion was mostly about boring out the cylinders and putting oversized ... I don't know if I buy all the logic behind having a honing to get a good ...
    (rec.autos.tech)
  • Re: IO-540 mystery
    ... Ask a guy who currently has 2 cylinders in the back seat of his Chevy Tahoe ... Both times it was the right engine after normal approach ... Do you normally turn the electric fuel pump on for maneuvers and leave it on ...
    (rec.aviation.owning)