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Will not start, injectors not getting fuel

Tiny
JEFFMARTINHYKO
  • MEMBER
  • 1990 BUICK REGAL
  • 166,000 MILES
3.1 MFI Will not fire up. I shot fuel into the throttle body and it fired right up, seems that the injectors are not all working, tries to start but barely. Check the wiring to injectors found some smashed, corrected that issue, still same problem. Does anyone have a wire diagram and/or what I should be getting at injectors. Should they have constant power which is what I seem to be getting. Replaced crank sensor, coil packs, plugs, wires, fuel pump, and filter. Does not throw any codes. I did check all wires from computer to injectors for continuity all have it.
Have power to injectors, should they pulse? They only show power constantly.
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Sunday, November 3rd, 2013 AT 12:14 PM

10 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sounds like the fuel injectors ground circuit is out-Have the computer tested-
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Sunday, November 3rd, 2013 AT 1:01 PM
Tiny
JEFFMARTINHYKO
  • MEMBER
  • 6 POSTS
How do I test it myself
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Sunday, November 3rd, 2013 AT 1:05 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check your fuelpressure first with a gauge auto part s rent them 41-47 psi with key on
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Sunday, November 3rd, 2013 AT 1:24 PM
Tiny
JEFFMARTINHYKO
  • MEMBER
  • 6 POSTS
Fuel Pressure is 40 pounds. Key on jumps right to 40 key off goes to zero
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Sunday, November 3rd, 2013 AT 1:27 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Not enough pressure, must meet minimum and check regulator as it should old pressure for 5 minutes
regulator is on the fuel rail
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Sunday, November 3rd, 2013 AT 1:33 PM
Tiny
JEFFMARTINHYKO
  • MEMBER
  • 6 POSTS
Does anyone know what voltage I should be getting at the injectors and which wires and colors to test. A diagram would be great
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Sunday, November 3rd, 2013 AT 1:33 PM
Tiny
JEFFMARTINHYKO
  • MEMBER
  • 6 POSTS
So what you are saying is that the fuel pressure should stay and hold pressure even with key turned back off? The fuel pressure regulator was replaced also. I was thinking the pressure was low. And that it should hold even after key was turned off. What would cause the fuel pressure to go imeadiately back to zero when I turn the key off.
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Sunday, November 3rd, 2013 AT 1:36 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Look you have low fuel pressure you have to fix that first. A faulty fuelpump check valve will cause what you are experiencing.
A faulty in-tank fuel pump check valve will allow fuel in lines to drain back to tank after engine is stopped. To check this condition, turn ignition off, disconnect fuel pressure line at fuel rail, remove filler cap, and connect a radiator test pump and apply 15 psi (1.0 kg/cm2 ) pressure. If pressure will hold for 60 seconds, check valve is okay injectors have 12.2ohms resistance. Besides you need wha tis called a noid light to test injectors not a probe. Here is injector wiring colors
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Sunday, November 3rd, 2013 AT 1:46 PM
Tiny
JEFFMARTINHYKO
  • MEMBER
  • 6 POSTS
Thank you very much I will check all of what you said and get back to you. Again thank you so very much.
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Sunday, November 3rd, 2013 AT 1:55 PM
Tiny
AIYELAGBE
  • MEMBER
  • 4 POSTS
On how to check the injector wires, one is ignition current while the other one will be the ground wire, if it correct then your injectors are bad if not check the whole fuse in the car.
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Tuesday, November 5th, 2013 AT 2:49 AM

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