Question about 1993 Chevrolet C1500

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GM TBI low voltage at the injectors

87 4x4 suburban won't start has spark, fuel pressure, injectors have been cleaned, truck will start if fuel is poured down the TBI and then dies. Pulled injector plugs to check voltage both plugs pulse from 0 to .02 volts. Checked all fuses all seem to be good. What am I missing? I have almost the same problem. I have a 93 chevy 350 TBI that was sitting for about 2years. It was running when I parked it but now I had to put a fuel pump on it to get it running . It doesn't want to start and when it does it asts like it is flooding for about 1 minite then runs fine.. If you turn it off for 5 minites it starts flodding all over again for about 1 minite. Does anyone know what could be the problem?

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Sounds like a computer issue on the burb, but i would check the IAC(idle air control) valve and the TPS(throttle position sensor) first.
I would start with the IAC on the 93'.

Posted on May 29, 2009

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IAC would be were I would start as well. This was a problem for us when doing propane conversions

Posted on Nov 29, 2012

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1 Answer

Injector not fireing


you have a TBI 8valve engine. just like my 91
the injector , not firing, so by guy method.
1: it dont click? (sonic ,stethoscope)
2: the noid dont flash. (use a noid lamp and win)
3: it dont squirte, watching it with eyes, cranking,

if the noid fails, that means ECU is bad or one of 3 inputs to ECU are dead.
if noid works, that means, the injector is cogged, it has 10 micron screens that are easy to clean. or there is no 35 PSI fuel pressure.

here is the page just for that.
  1. THE ECU IS PROGRAMMED to cut fuel if there is no spark preventing TV like crashes and burns. (and other fire reasons)
  2. the tests are all easy. no order but #1 is #1
  3. fuel pressure at spec.
  4. injector coil reads 1.0 OHMS.
  5. injector clean. (there is only one, so all hope is just here)
  6. noid lamp fails , so is CMP dead? or TPS TP pin stuck high or , ecu throwing code 41./42s errors, BINGO!

http://www.fixkick.com/INJECTORS/injectors.html

or no starts

http://www.fixkick.com/INJECTORS/injectors.html

May 06, 2014 | 1992 Geo Tracker

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Geting fuel .spark.i spray gas in the throttel it run


you need to pull throttle body off and do an inspection and cleaning built up grime on it

Nov 09, 2013 | 1995 Isuzu Trooper

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1992 4.3 v6 tbi s10 starting problem. Won't squirt


Are the injectors getting power and a ground signal from the computer ?

Sep 06, 2013 | Cars & Trucks

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I have a 1988 suburban 1500 4x4 5.7 liter v8. I replaced fuel pump and filter, will start and run for about 10 seconds then die and will not restart. Not getting fuel somehow. Injectors were also replaced....


Most likely it is the fuel pressure regulator..also check for spark here's some info for you.. The first thing to do is check for spark.

Disconnect #1 ignition wire at the spark plug.
Install a spark tester into the end of the spark plug boot.
Have an assistant crank the engine over and check for spark at the tester.
Repeat this process at each spark plug.
If any cylinder does not show spark, proceed to secondary component tests.
If ALL secondary components show no spark, test components individually.
If all cylinders test O.K., inspect for fouled spark plugs and clean or replace as necessary.

2010-08-21_174426_1.jpg

If spark checks out good, then you could have a fuel delivery problem. I would recommend to start by checking fuel pressure. Fuel injected cars are very fuel pressure sensitive. Fuel pressure is very important and must be within specifications! But if the pressure is low, it does not mean the pump is bad. A plugged fuel filter, a pinched line, and low voltage at the pump can contribute to low fuel pressure. All three must be check before replacing the pump! You can get a fuel pressure gage at a local auto parts store for cheap.

Fuel pressure testing is frequently overlooked but it is one of the common causes of poor performance. The test procedure must include testing that will insure normal
fuel pressure under all operating conditions.

Key Factors

1. Fuel demands are low at idle.

2. Wide open throttle at high engine revs uses the most fuel.

3. Port injection fuel pressure must be reduced when manifold vacuum is high. Vacuum pulls fuel out of the injector causing it to deliver too much fuel if the pressure remains high. Manifold vacuum is used to open the pressure regulator at a lower pressure when vacuum is high.2010-08-21_175858_1.gif

Mar 31, 2013 | Cars & Trucks

2 Answers

1989 K1500 was running fine and just quit. Not getting gas but I can hear the fuel pump start when I turn the key on. took fuel line off of TBI and seem to have plenty of gas flow but nothing comes out of...


you need to have the fuel pressure checked with a gage and volume as if its not at the spec the injectors won`t open to spray enough fuel.also you should check the injectors for proper voltages and ground as if these are not within specs then the injectors won`t work either

Oct 17, 2011 | 1989 Chevrolet K1500

1 Answer

1992 chevy s10 2.8l v6 tbi 2wd 5-speed. no signal on the noid light tried a new computer, new distributor, fuel pump and relay, fuses, can it be a sensor? or oil pressure switch? oxygen sensor?...


i assume your talking noid light for the injector.have you checked for battery voltage at the injector and for the ground side of the circuit at the injector as either one missing it won`t work.the injector is grounded by the computer and the power is supplied when the key is turned on.these are the two places to start to check.

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My 1998 Chevy Blazer crank excessively when I try to start it. It always starts, and runs good when I get it started, but I would really like a smooth start. I have recently changed the fuel filter, spark...


leaky injector/s is flooding motor, mechanically clean or replace. And clean throttle body while you are at it with spray cleaner. Should be almost spotless where large throttle valve opens and closes.

Oct 21, 2010 | 1998 Chevrolet Blazer

1 Answer

89 suburban. No spray from injectors after replacing ESC


The fuel pump should be in the 20s. Also it could be losing presure slowly. Leave the fuel pump pressure gage on for at least 2 to 3 hours to see if it is losing pressure - It's a start

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89 GMC K2500 5.7L TBI not spraying fuel


have you checked the coolant temp sensor? it controls air-fuel mixture.

Jul 16, 2009 | 1989 GMC K2500

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