I'm going to ask the same question a different way... maybe that will help.
I have a 1998 GMC Z71. At 199,250 miles I changed the engine out from
a 305 to
a 350 (crate - new in the box). That was 22K miles ago. The truck has
running great until about 3 months ago when I noticed it getting hard to
coming in from offshore (2 week hitches). (By "hard to start"... I mean I
the key, the engine would turn over... but not crank up. I would have to do
several minutes until it cranked) Now...Today / currently... I'm having to
key in attempts to "crank" the engine) - for about 15 minutes before the
"crank" - "fire up" - "run".
Now, here's the kicker. This problem ONLY happens when the truck sits for
days. If I crank and drive the truck daily - it "fires" right up every time.
meaning, the engine cranks up allowing me to drive the truck) - Driven
never gives me any problem. Cranks every time. 57 times in a row if I ask
Just when it sits up for a few days does it give me this problem.
More info... I have no problems with the battery - it's hot and ready. My
my fuel pump (which I hear when I turn the key on - humming like it's
was changed not long ago and are working as designed. Plugs, cap, rotor
wires were changed when the engine was installed (22K miles ago).
So, when I'm attempting to crank the truck after it's been sitting for a few
"first attempts" - it acts like it has no fuel. Like the fuel line is empty.
will hick up and cough a little. Very little smoke from the tail pipe if any...
black when it does. It has only back fired once since all this started. It's
it's flooded at this point... but then again, once it cranks and I drive it - it will
and run every time. Until I let it sit for a few days. Then, it's more of the
So what do you guys think? What's happening here? Why is my truck
I am suspecting the spider injection assembly. Was this changed out when you put the new motor in? Do a fuel pressure bleed down test, by hooking up a fuel pressure gauge to the Schrader Valve up on the intake manifold, turn the key to the on position and let it build up fuel pressure. Fuel pressure should be 56 to 63 lbs. Then turn the key off and let it sit for 3 to 5 minutes. The fuel pressure should not drop down more than 5 lbs.
Fuel Regulator the pressure should be 65 to 68.
1998 yr. I see...My answer still stands.
Spider was not changed out with the engine. I've got another week at work and if the ole gal will crank, I'll check this out when I get home. Thanks guys for the response.
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