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Starting problems

Tiny
CRAIG C
  • MEMBER
  • 1989 GMC SIERRA
  • 4WD
  • AUTOMATIC
, 89 gmc/350 I replaced ing coil and still not getting a spark, I even poured gas into carb and truck still wont fire off and also when I turn key on I dont hear the fuel pump run
Sunday, April 3rd, 2011 AT 5:52 PM

11 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you check primary voltage at the coil, pink wire, goes hot with the key on.

As far as your fuel pump, there should be an o/p, oil pressure switch, in the fuel pump circuit. Once you crank it enough to bring up oil pressure, the switch closes and the pump gets voltage. I can't here the pump with engine cranking.
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Sunday, April 3rd, 2011 AT 6:12 PM
Tiny
CRAIG C
  • MEMBER
  • 7 POSTS
Yes all wires hot when plugged in all I have is circuit tester should the spark post to the dist be hot also w tester
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Sunday, April 3rd, 2011 AT 6:39 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Take the coil wire loose from center of distributor cap, hold close to engine ground, engine cranking watch for spark to jump. Anything?

Check for applicable trouble codes. You can check those codes yourself.
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Sunday, April 3rd, 2011 AT 6:58 PM
Tiny
CRAIG C
  • MEMBER
  • 7 POSTS
Yes I went and swaped coils again and put a ing spark tester between coil and coil wire and still no spark out of coil can 2 new coils have the same problem
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Sunday, April 3rd, 2011 AT 10:13 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The white wire should have a pulse, engine cranking. If voltage but no pulse, suspect the ignition module or pickup coil.
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Monday, April 4th, 2011 AT 12:09 AM
Tiny
CRAIG C
  • MEMBER
  • 7 POSTS
I dont know if it pulses while cranking but, both sets of pink and white wires are hot when pluged into coil and nothing comes out?Thats where im lost power goes in and not out, but is the pick up coil in inside dist, im not to sure where the ign module is located. But these would cause coil not to spark?With my lack of test egt how can I check these items?
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Monday, April 4th, 2011 AT 11:47 AM
Tiny
CRAIG C
  • MEMBER
  • 7 POSTS
Rechecked does not pulse checked coil wire shows good ohms
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Monday, April 4th, 2011 AT 2:15 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
My thought is the ignition module. I believe the coil sits on top of it.
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Monday, April 4th, 2011 AT 3:19 PM
Tiny
CRAIG C
  • MEMBER
  • 7 POSTS
Replaced pick-up coil and ign mod, hooked everything up. Truck fired off, runs good."Thank you" for sending me the right direction
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Monday, April 4th, 2011 AT 4:51 PM
Tiny
CRAIG C
  • MEMBER
  • 7 POSTS
I went hi-tech and bought a m/m lol. Turned out to be the p/u coil
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Monday, April 4th, 2011 AT 4:57 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Well, glad you got it going your way.
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Monday, April 4th, 2011 AT 5:08 PM

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