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1 23rd January 21:34
mav
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


I have a 97 chevy Blazer 4.3 that won't run worth crap now. I replaced
the fuel pump unit, spark plugs, plug wires, cap/rotartor, and ingnition
coil. The truck will start then stumble to a halt seconds later. I used
starter fluid to keep it running by spraying in to the throttle bore, once I
stopped the start fluid feed it stumbled to a shaking halt. I am thinking
it is an injector problem or injector controller problem but don't know how
to go about trouble shooting this problem. Also I tested the fuel pressure
at the fuel line on the engine and it reads between the 60-66 psi like it is
suppose to.

I also kept getting a P0300 code for the last couple of months but then it
would go away. P0300 multiple/random misfire detection. When I pulled the
plugs they were all black as coal so I am assuming it's been running really
rich lately.

Any help would be appreciated.


Thanks,
Mav
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2 23rd January 21:34
transsurgeon
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


EGR valve is jammed open by carbon deposits
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3 23rd January 21:34
\doc\
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


Or it's time for the injector nut kit.................. Doc
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4 23rd January 21:34
mav
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


Nope not EGR, no flag on it since I replaced it a year....besides the truck
runs good when I directly pour fuel into the intake or spray starting fluid
in there also for prolonged moments...soon as I stop the truck comes to a
stumbling starving stop.....

What is this nut kit on the injectors your talking about?
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5 23rd January 21:34
\doc\
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


My bad, if it's starving for fuel it ain't the pressure regulator/injector
nut kit. When they go it runs super rich. Doc
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6 23rd January 21:34
commentator
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


The only "nut kit" required is for the OP....

I question anyone who uses starter fluid at the best of times. This sure
didn't sound like a situation that called for it.
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7 23rd January 21:34
mav
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


It was safer than directly pouring the gasoline in from a can......at least
I can stand back a little ways when spraying into the intake. We do this
all the time when we ran our race buggies to get them ready to start....
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8 23rd January 21:34
mav
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


I'm thinking something wrong with the injectors or the control for firing
the injectors. It did look as though the truck was running rich for some
time since the plugs were all nice and black coated all over. I just wish
someone new how to test to see if the injectors were bad or what might be
causing it.

Anyone know how to test using a multi-meter to get readings off the
injectors or the sender for anything like that and what the output reading
should be? I wish I had bought a helms book set for this truck already but
I didn't think it would take a crap already at only 100,000 miles.

Mav
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9 23rd January 21:35
commentator
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


Do you have any idea what that does to your engine though? As an FYI, it is
one of the quickest ways to lose an engine warranty.

The ONLY time I have ever felt comfortable using that stuff is to start the
pup engine on a CAT tractor that has been sitting in the field in -40
weather in Labrador. At least those pup engines are more or less
disposable. Other than that, the biggest use starter fluid has ever been to
me is cleaning my tools.

I appreciate your comment about the gas, but I have seen friends blow up
their engines because they thought it was ok to use that stuff on a cold
day.
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10 23rd January 21:35
john alt
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Default 97 Chev Blazer Fuel/Injector Problem? HELP


In article <XSCVb.32263$4X.780750@twister.tampabay.rr.com>,
mavcam@cfl.rr.com says...

It sounds like a fuel relay to me. They have a timer function that
allows oil pressure to build up, then the system goes into it's normal
operation. If the oil pressure is lost, the fuel pump is cut off. It
sounds to me when the timer runs out, the pump is cutting off.

I'm not sure what the wiring looks like on the 97 blazers, but there is
a test point on the fuel pump circuit. It's in the trouble shooting
section in the Hayne's book, I know I've seen it. On the older TBI
units, there was a test point in the ALDL connector, but that's gone
now. It's now in a pigtail off the relay, IIRC. Anyway, put a voltmeter
on the fuel pump wire, crank it, and watch for the voltage to drop after
a few seconds, FOLLOWED by the engine quitting. If the engine dies
first, THEN the pump loses voltage, that is normal (since there is now
no oil pressure). If that's it, check your oil pressure switch wiring.
If you haven't done so since it quit, pull the dipstick. The gauge on
the dash has nothing to do with the computer oil pressure switch, BTW.
Separate circuit.
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