1994 s-10 engine problem...need help

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timbittner317@hotmail.com - 10 Dec 2006 16:24 GMT

It's a '94 s-10 p/u w/ the 4.6 Vortec engine. Automatic. Within the
past year I've replaced the fuel sending unit, fuel lines, fuel filter,
battery and several other unrelated items. Unfortunately this past
week on the way to work (in a snow storm of course) the engine stopped
and would not restart. Upon checking the battery it is strong enough
and supplying the necessary power everywhere. When I try to start it
up everything sounds like it should, except the engine is not starting.
Any ideas as to where I should start to look to figure out what is
wrong? Should the first thing I look to do is get some "dry gas"? Any
help/ideas would be appreciated. Thanks in advance.

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Bob Urz - 10 Dec 2006 16:38 GMT

> It's a '94 s-10 p/u w/ the 4.6 Vortec engine. Automatic. Within the
> past year I've replaced the fuel sending unit, fuel lines, fuel filter,
[quoted text clipped - 6 lines]
> wrong? Should the first thing I look to do is get some "dry gas"? Any
> help/ideas would be appreciated. Thanks in advance.

If you had a timing light, you could see if you have spark during no
start conditions. You need to determine if you have a no spark problem
or no gas problem. Some models had trouble with fuel injection "spiders"
or hoses in the manifold that could cause trouble. DO you smell gas
under the hood when this happens?

Why did you change the fuel system parts in the past?

Bob

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timbittner317@hotmail.com - 10 Dec 2006 16:46 GMT

> If you had a timing light, you could see if you have spark during no
> start conditions. You need to determine if you have a no spark problem
[quoted text clipped - 3 lines]
>
> Why did you change the fuel system parts in the past?

Yes there is the smell of gas under the hood. (Forgot to mention that
in the post.)

The fuel sending unit was replaced because the engine was not receiving
gas. The rest were changed at the same time because the lines were
rusted and corroded.

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jerry@peru-motors.com - 10 Dec 2006 17:34 GMT

tim-if you have spark then I would put a fuel pressure gauge on the
fitting on the back of the engine-near the fire wall, near the master
cylinder.(buy or rent or borrow one). If you key on the truck you
should a)hear the fuel pump run-if you do then b) look at the pressure
guage-in fact forget listening for the pump because if the gauge goes
up at all, the pump is running. What you'll probably see is around 60
lbs psi key on initially for 2 seconds or so. Then I suspect(if you
smell fuel) that after the fuel pump stops running(2 seconds) your
pressure will 'bleed' off immediately-if it does you have a fuel leak
somewhere and with the 4.3l vortec v-6 my guess is inside the 'plenum'.
Either the fuel pressure regulator(available after market-reasonable,
or the plastic fuel lines that feed the injector unit(I usually
purchase thru GM-called a 'Nut Unit'. If this is the direction that
you go, once the upper plenum is taken off, I unhook the neg. batt.
terminal right off the bat , then when the upper plenum is removed I
turn your ignition on, go back under the hood, reach over and thread in
the neg. batt. terminal and watch the injector unit-usually it'll
reveal the source of your problem. Keep in mind-check for spark, check
for fuel pressure, don't jump to this conclusion but this could
possibly be the way it goes. good luck Jerry@Peru-Motors
www.Peru-motors.com

> > If you had a timing light, you could see if you have spark during no
> > start conditions. You need to determine if you have a no spark problem
[quoted text clipped - 10 lines]
> gas. The rest were changed at the same time because the lines were
> rusted and corroded.

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