Question about 1993 Chevrolet C1500

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1994 4.3 tbi spray problems - 1993 Chevrolet C1500

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Yes very common problems with the "spider" fuel injection unit.
Remove the top of the intake manifold to access the FI "spider unit"
The injectors can be replaced separately. Also sometimes it's the pressure regulator that's bad, and leaking so check for that can check the injector spray pattern if you are careful doing it.(disable the coil, have lots of rags and a friend crank the motor while you check the pattern of each injector) (hint - if you are really cheap you can actually "clean" the end of the injector with a small screwdriver , try to roll the ball around to remove varnish, then recheck the spray pattern.

Posted on Nov 29, 2013


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My 1993 Geo tracker fuel systen is not working, the injector is not spraying. now it is sprayin on the inside of the carborator and filling the carborator up.. how do i fix this problem//

there is no CARB on this car.
that must be the throttle body engine, TBI EFI.
1 injector engine not the 4 MPI engine.
G16a is TBI G1b is TBI and both sold day 1 , new.
its is supposed to spray, but you forgot to say when.
just key on over and over not running, (not spray is correct)
it sprays cranking and running,, that be its job1.

lets say it sprays key one.
That means:
1: injector leaks.
2: injector - o-rings are bad. (cracked)
3: ECU injector drivers shorted (bad ECU)
you can look at the inject on this car, air pipe off TBI horn.
see if the seals leak or injector tip leaks ?
if the injector actually leaks.
unplug the injector connector (4pin plug)
leak now.
yes, injector is bad or just o-rings
no, the ECU is bad. (common on this car)
i can even tell you which transistors are bad.... etc.....ask.

both engines covered here.

Dec 09, 2015 | 1993 Geo Tracker

1 Answer

94 tbi starts but dies unless u pump the gas it runs rough

This could be a whole range of problems from lack of fire to engine to a bad fuel pump or pressure regulator in the TBI but if all of that is good then check the Cat. converter to make sure it is not plugged or the muffler. As I have 1994 Chev Silverado myself I know you can pull the 02 sensor out ahead of the cat. and it should run better not well but better. It will relieve the back pressure to the engine.

Jul 11, 2014 | 1994 Chevrolet K1500

1 Answer

I have a 1994 Dodge Dakota, 3.9L V-6 with TBI. I just bought it 3 weeks ago, and after it's been running long enough to get up to temperature, if I shut it off it won't start for maybe 15-30 minutes. It...

Check fuel pressure with a gauge at the motor
You bought for I don't know what reason a 20 year
old vehicle,so your going to be fixing something
I had a 1992 new & except for the brake tubing rusting
I had no problems

Aug 01, 2013 | 1994 Dodge Dakota Club Cab

2 Answers

1994 chevrolet 5.7 TBI running like poop

Fuel enrichment? The TBI /ECM system increases fuel mixture when cold starting. If you have low fuel pressure or dirty injectors it will impeed this function. The computer will continuely try to solve but cannot do to the low fuel function, should get it fixed right away as it will burn out the phase of the computer that controls this. Fuel pressure test first, it should hold between 9 -13 lbs of pressure. If you have not changed the fuel filter inline located on the frame do so $10 and it could be the fix. You can hookup a timing light and point at the injectors and this will illuminate the spray making it easier to see, the spray also will run in time with the light so if it is not there is a sequence problem between modulator, computer and possibly a crank/cam position sensor. Good Luck

Apr 30, 2010 | 1992 Chevrolet C1500

1 Answer

Bad crankshaft sensor on a 1994 GMC k1500 5.7L TBI Auto?

if your o2 sensor is reading too lean then you have a vacume leak spray brake cleaner on all your vacume hoses one at a time if nothing then spray it around your intake manifold gasket they are usually the culprit

Feb 05, 2010 | 1994 GMC Sierra

2 Answers

Where is the fuel filter

To the rear of the gas tank under the car.

Oct 20, 2009 | 1994 Plymouth Sundance

1 Answer

My 94 s-10 4.3 wont spray fuel?

you can purchase what is called a noid light not to expensive they plug into the injectors conection the noise your hearing is called a two second run . if the light don't come on the ignition modual needs replaced that is mounted under the distributor cap .

Aug 26, 2009 | 1994 Chevrolet S-10

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