1990 Buick Skylark No start

Tiny
TEXASDAWG2003
  • MEMBER
  • 1990 BUICK SKYLARK
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
Car has new fuel pump, it will run on carb cleaner, it will light the test light on the dark wire to the injector
Nothing from blue wire also the computer wire to the fuel pump relay does not are any g or h
Fuel is good and have all at her hots and grounds to relay
What is causing this

Car will not start on its own and it will not turn feel pop on
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Friday, March 28th, 2014 AT 3:13 PM

12 Replies

Tiny
JDL
  • EXPERT
With the fuel injector connector plugged in, key on, If you probe wires, both wires should be hot?

Could be problem with ignition module?

Because your obd1, you can check codes, yourself. You use a jumper wire between the A & B terminals at your data link connector. Turn key just till the dash lites come on, no further. Then the mil on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes.

The picture is just to show location of terminals A & B. The data link connector should be a long lower edge of dash between steering column and driver door.
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Friday, March 28th, 2014 AT 3:46 PM
Tiny
TEXASDAWG2003
  • MEMBER
What about fuel pump not coming on
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Friday, March 28th, 2014 AT 4:09 PM
Tiny
JDL
  • EXPERT
When you first turn on the key, no crank, can you hear the fuel pump run for a couple of seconds? If not, I'd check voltage and ground at the fuel pump connector, engine cranking. If good voltage and ground at the fuel pump and no fuel pump action, I suspect the fuel pump.
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Saturday, March 29th, 2014 AT 8:01 AM
Tiny
TEXASDAWG2003
  • MEMBER
Fuel pump does not come on when you turn key on,
the fuel pump is new can jump the test wire under hood it will come on it has power and ground to relay but the wite from computer does nothing
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Saturday, March 29th, 2014 AT 12:10 PM
Tiny
JDL
  • EXPERT
If I remember correctly, there is an oil pressure switch in parallel with fuel pump relay on this vehicle, once you crank it enough to bring up oil pressure, the pump should run, regardless of the computer. The only thing is, I can't hear the pump run, with engine cranking. I have to use a gage and check fuel pressure.

I'll post the wiring for fuel pump.
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Saturday, March 29th, 2014 AT 3:18 PM
Tiny
JDL
  • EXPERT
Fuel pump wiring.
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Saturday, March 29th, 2014 AT 3:23 PM
Tiny
TEXASDAWG2003
  • MEMBER
Would the oil pressure switch stop the dc current going tot the pump if it was bad. Only time I get current to the pump is when I jump to the prim wire from the battery. But the car still does not run unless I spray carb cleaner down tbi that tells me spark side is good its all on the fuel side
Even when cranking the prime wire will show power so that should rule out the oil sending unit but the car does not spray fuel would the ING module be bad on this side or should I be looking at computer the batter was dead so it did not store any codes
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Saturday, March 29th, 2014 AT 6:24 PM
Tiny
JDL
  • EXPERT
Do you have an injector pulse, engine cranking? If the computer doesn't pulse the ground, could be issue with wiring circuit--computer or ignition module.
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Sunday, March 30th, 2014 AT 1:53 PM
Tiny
TEXASDAWG2003
  • MEMBER
There the nod light does not flash
So does ign mod make fuel pump come on when you first turn key on
Because these are the only two things not working
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Sunday, March 30th, 2014 AT 7:39 PM
Tiny
JDL
  • EXPERT
The oil pressure switch and fuel pump relay are a redundant power supply to the pump. They are parallel circuits, one doesn't effect the other, although both may get voltage from the source.

Did you check fuel pump injector fuse for voltage? The green wire with white tracer at the relay, should be hot, initial prime or engine cranking, that voltage comes from the pcm.

Like I said, if the oil pressure switch has voltage and is functional, the pump will run, even without the relay. I don't know what else to tell you? I can't see much from here.
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Monday, March 31st, 2014 AT 10:32 AM
Tiny
TEXASDAWG2003
  • MEMBER
Just to let you know it was the computer,
I just hate putting in computers when a lot of time is something else before you get it the computer it's one of the parts that get changed when it don't need to be replaced
Car runs good know
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Monday, April 7th, 2014 AT 8:25 AM
Tiny
JDL
  • EXPERT
Good job. Glad you got it going your way.
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Monday, April 7th, 2014 AT 9:10 AM

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