WONT START

1986 GMC S15

Tiny

derbyguy74

March, 21, 2010 AT 8:18 PM

Electrical problem
1986 GMC S15 6 cyl Two Wheel Drive Manual 171428 miles

My truck wont start. It has spark and fuel to the throttle body but the injectorswont pulsate fuel. If I spary starting fluid in it it runs fine for a minute.

FOUND 51583 RELATED QUESTIONS

12 Answers

Tiny

rasmataz

March, 21, 2010 AT 8:28 PM

Hook up a noid lite to the injector/s harness and see if it flashes if so the injector/s is the problem no flashes could mean power input or the computer injector/s ground drivers-

Tiny

derbyguy74

March, 21, 2010 AT 10:18 PM

Noid lite?

Tiny

derbyguy74

March, 21, 2010 AT 10:22 PM

The ecm b fuse blew and when I put a new one in it blows imedeitley. I checked the wires that go to the fuel pump and they were fine. The ECM B fuse is the fuel pump. What else runs off that fuse?

Tiny

rasmataz

March, 21, 2010 AT 11:59 PM

The fuel pump relay, oil pressure switch, fuel pump and computer

Tiny

derbyguy74

March, 22, 2010 AT 12:31 AM

The manual says the ECM I fuse is the computer and that fuse is fine.

Tiny

rasmataz

March, 22, 2010 AT 7:27 AM

Mit1 says it powers the items I've mentioned earlier I viewed the electrical diagram/schematics

Tiny

derbyguy74

March, 22, 2010 AT 12:27 PM

Is the fuel pump relay under the hood? There are 3 relays under the hood.

Tiny

derbyguy74

March, 22, 2010 AT 2:32 PM

So I looked at the three relays under the hood on the drivers side fender and the middle relay looks like it fried because the plug and bottom of the relay are black. I cant read the numbers on the relay so I cant cross refrence tot see if it the fuel pump relay.

Tiny

rasmataz

March, 22, 2010 AT 3:28 PM

S15 2.8 liter the FP relay is located on left front fender panel behind AC compressor relay-Sorry no pic available.

Tiny

derbyguy74

March, 25, 2010 AT 5:58 PM

Ok. I have replaced the fuel pump relay, ignition control module, computer and oil pressure sensor. It still blows the ECMB fuse even when the computer is unplugged and the key is off.

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