Hey guys, I'm a Dodge man so I'm hoping you Chevy guys
can help me out. I'm sure ya'll seen it & delt with it already.
I now have a 1996 Chevy Blazer LT 4.3L 4x4. This thing has
been total pain in my *** so far. I used to own a 91 S10
pickup, clearly these's LT's don't share the same heart as
thye S10's even though it's pretty much the same thing.
Anyway's, here's the issue:

My next project bringing this thing back from the grave is it's
fuel system. It take's 7 - 9 cranks for the engine to turn over.
Sometimes it will pop over after 2 - 4 but its rare.
It's also has been using fuel like it's free. I checked the trouble codes,
so far all that pops up is the three that corresponds to the three
O2's. I know they're shot & yes fuel millage goes into the toilet.
I've seen severe cases of this before in my own Dakota, when both
failed, I'd use a tank of fuel a week just going to work. I only worked
2 miles away. Although this thing drinks $20 worth in ten miles.

I was, I.E. was, trying to fix the crank issue, I've read some post's
on it here & got some insight. The fuel pressure is adequate for this
truck, the lines have no restriction, the tank doesn't build to much
pressure. No extra trouble codes. I read here it could be caused by
the fuel pressure regulator. I decided to change it. Here are picture's
of the originals condition:













The Spider condition wasn't very hot either. Injectors were horribly
crummy too. I cleaned everything up & put it back together shown in these pictures:













NOTE: Yes I know in the picture the fuel pressure regulator
is upside down, I corrected the problem before putting
everything back together.

All new Plentum gasket set installed.

Now here's the problem:

After doing this the first time, the engine jammed
after the third crank. Yeah, I almost sh*# my pants.
I thought it was the starter. It sounded like it was
stripping teeth from the fly wheel. Long story short,
it wasn't that. In a panic I tore it back down looking
into the ports with a flash light to see if I dropped
anything, I was sure I didn't, I had all ports plugged
with paper towels. Besides a small piece of paper
towel being in there, I used throttle body cleaner.







Of course I didn't see anything but got one hell of
a whiff of gas. I decided to pull the spark plugs &
sure enough, three out of six cylinders were plum
full. About a gallon of gas poured out total from all
three holes. I've never seen that before. And I know
there has to be gas in the oil pan now. I thought
mabey I got way to much gas in when purging so I
drained it by opening all the spark plug holes & hit
the starter. Starter made no abnormal noise either.
I put the plugs back in, turn the key once, after the
third crank, she locked up again. I pulled the plugs,
she was over full again on fuel.

At this point I'm thinking the injectors are shot. I over
to B&H & got another complete spider. "used of course".
That one was in worse condition so I cleaned it & put
the new fuel pressure regulator on it. It did the same
thing on the third crank.

I called around & got multiple "could be's".
Advance: check the carb, could be wide open.
The butterflies stay mostly closed.
O'Rielly's: Lot of problems with the older spiders,
update it.
Autozone: pull the wire harness from the spider
& try to start it. It "could be" the ECM opening
three ports wide open. I did that, no differance,
locked up on the third crank.

Yesterday I got so pissed I pushed it out of the
garage & it hit the house. I don't really care at
this point.

Any idea's guys?

 

Wow. Never heard this myself but I'm new to all this spider stuff. I would start by putting the old regulator back on and never calling that guy from Advanced again.

 

See that's the thing, noone seems to have heard of this. But then again I can't be the first to have this issue. If this hadent happened to myself i wouldnt even believe its possible. as far as advance goes, its just the typical know nothings behind a computer. if it aint on that computer, they know nothing of it

 

Try to work through the steps in this thread: 96+ Fuel System Diagnosisand see what the various pressure readings lead you to, but I'm going to guess that it's either a leaking regulator or the poppets are shot.
You don't have a carburetor.

 

Okay, the problem is half solved. It's alive... kinda.
I thought about what spittybays said about the
regulator. I sh*$ canned it. I went back to B&H
& swapped out the original one & got the newer
updated one. I also used the regulator it came
with. Suprisingly this spider is in fair condition.











Seems to be doing a hell of a lot better than
the other one. She isnt filling the cylinders &
jamming up. Although now I have to pump the
peddle & crank it about 10 times & she will fire.
Runs like crap though. I'm hoping thats due too
the gas in the oil. I noticed I have a magore
leak in the check valve that connects into the
valve cover & runs to the booster. Needs an
O-ring. I have the tune up parts, I'm syre that
would help too. As many times as I had too
remove the spark plugs, they aint so hot anymore.
I'm gonna dump that oil ASAP.





By the way, I tried to get a good image of the
gas build up. The cylinders were so full the air
intake was a lake.

 

That brake booster is the largest vac line on the whole motor. If you have a leak there I don't care what kind of parts you put in the thing is going to run, if at all, like complete dog sh*t. Anyway glad it was the bad reg dumping the fuel. See if you can get your money back.
Pics are nice but unless theres something specific it makes for a long scroll.

 

Thank you guys for all your help!!!
Problem done & solved.
After replacing the oil & a full tune up,
PVC valve & check valve o-ring replacement,
shes running like a champ now. 2 - 3 cranks
& she turns over. I think I found the whole
reason this took place too. Wrong fuel pressure
regulator. RockAuto: STANDARD MOTOR PRODUCTS Part # PR203T









The two configurations are VERY different.
And this is what RockAuto has listed for a
1996 Chevy Blazer 4.3L.
The two old & the new updated spider has
the same regulator. I guess caution when
purchusing from RockAuto. RockAuto has
awesome prices but I guess not everything
is dead on. Everything else I bought from them
so far for this truck works like a champ. This is
the first mess up. Thank you guys again for your
Support & suggestions. I hope this thread helps
someone else in the future so they wont go through
what I did. This was very FUBR!!!

BTW spittybays, you're seriously right about that vac line.
I replaced that o-ring. I tried to start it without the line
hooked up, it didn't run like sh*%, it tried to blow its self
up. Apon turnover, the engine about maxed it's RPM's. I
had to kill the engine, it would not lower the RPM's. I hope
noone has to go through this crap.

 

*Image Posting... PLEASE READ!*

 

I noticed my first post has somehow lost all the pictures.
I apologize for the BS.
Here are all the lost photos in order.

Original Fuel Spider & Regulator Condition:

Dirty Fuel Spider And Reg Photos by PhilBilly1987 | Photobucket

Cleaned Fuel Spider & Put On New Fuel Pressure Regulator:

Clean Fuel Spider And New Reg Photos by PhilBilly1987 | Photobucket

Plugged Ports w/ Paper Towels:

Dirty And Clean Air Intake Photos by PhilBilly1987 | Photobucket

Newer Updated B&H Fuel Spider:

Updated BandH Fuel Spider Photos by PhilBilly1987 | Photobucket

Gas Build up in the Air Intake:

Gas Build Up In The Air Intake Photos by PhilBilly1987 | Photobucket

Fuel Regulator Difference:

Fuel Regulator Difference Photos by PhilBilly1987 | Photobucket

 

Philbilly, thanks for posting such a detailed discription w/photos. I am having the exact same problem this weekend. I have gone thru the same steps as you with the same poor results including giving up in frustration.Didn't hit the house though when pushing it out of the garage! guess I will have to push it back in and try again.