starting problems

1989 GMC SIERRA
4WD • AUTOMATIC
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CRAIG C
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,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
Apr 3, 2011 at 5:52 PM
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JDL
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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.
Apr 3, 2011 at 6:12 PM
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CRAIG C
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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
Apr 3, 2011 at 6:39 PM
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JDL
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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.
Apr 3, 2011 at 6:58 PM
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CRAIG C
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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
Apr 3, 2011 at 10:13 PM
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JDL
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The white wire should have a pulse, engine cranking. If voltage but no pulse, suspect the ignition module or pickup coil.
Apr 4, 2011 at 12:09 AM
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CRAIG C
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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?
Apr 4, 2011 at 11:47 AM
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CRAIG C
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rechecked does not pulse checked coil wire shows good ohms
Apr 4, 2011 at 2:15 PM
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JDL
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My thought is the ignition module. I believe the coil sits on top of it.
Apr 4, 2011 at 3:19 PM
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CRAIG C
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replaced pick-up coil and ign mod,hooked everything up.truck fired off, runs good ."thank you" for sending me the right direction
Apr 4, 2011 at 4:51 PM
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CRAIG C
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i went hi-tech and bought a m/m lol.turned out to be the p/u coil
Apr 4, 2011 at 4:57 PM
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JDL
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Well, glad you got it going your way.
Apr 4, 2011 at 5:08 PM
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