Question about 1990 Chevrolet K1500

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My 1990 chevy pickup truck did not pass epa emissions test. I put in new plugs and wires, new distributor cap and rotor, and changed the oil. It ran alot better but still a little viberation, so I replace the ign. coil. Then there was no spark from the coil to the distributor cap, so thinking that the new coil was bad, i exchanged it for another. Still no spark coming from the coil to the distibutor cap. I checked the fuses and the wires for breaks, all that is ok. I am puzzled now. Can you help me?

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  • Contributor
  • 4 Answers

Have you tried reversing the wire's on the coil ?

Posted on Nov 29, 2012

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

MNfisherman
  • 11896 Answers

SOURCE: 1996 chevy truck 305 new rotor and distributor cap

did you test or replace the crankshaft position sensor? That is where the spark signal begins.

Posted on Sep 24, 2010

csmock132
  • 4669 Answers

SOURCE: no fuel no spark 1990 k5 blazer 350

Take off the distributor cap. Check the star wheel that is splined to the distributor shaft that the pick-up coil uses. Make sure this wheel is not loose on the distributor shaft. It is right above the pick-up. If it is loose, replace the distributor. This is a common problem. If it needs one, all the part stores stock the distributor.

Posted on Mar 08, 2009

  • 420 Answers

SOURCE: went to PEP Boys they ran a diagnostic test and

My experince with PEP Boys is they do not honor their warrenties. But I would go back and complain about the car running hot since the only part of the cooling system they didn't change was the radiator they did something wrong. It should not be running hot. Is the cooling fan running? If not they probably didn't reconnect the wires to it or broke a wire. They also conned you on the water pump, you have to take out the distibutor to get to the water pump not the other way around.

Posted on Apr 21, 2009

co7196
  • 3433 Answers

SOURCE: 1990 Chevy Silverado Pick-up. No spark from the plugs.

fairly new won't quite do it. HEI ignition? They have a very hot spark and that hot spark burnsthe rotor in its center under the tang through to groung,advance weights. Change rotor and place some silicone on center of cap and the underside center. - Good luck. -Ned
Note, HEI ignition, coil is on top of distributor under a plastic cap.

Posted on Jun 23, 2009

  • 491 Answers

SOURCE: 1990 K5 Blazer DIED(Electrical?)?

There may be no injector pulse if the computor does not see a RPM signal.
There will be no spark if the ignition module does not see a dist pulse from the dist pickup.......a RPM signal.
Because you do not have both ......I would suggest to check/change the dist pick up.
Follow the wires from the ignition module inside the dist to the pickup which is also inside the dist.
If it is just a bad dist pickup....keep all your old parts as good spares.
Also...is the dist turning? to provide a RPM signal?
You will have to remove the dist to change the pick-up.....mark your timing locations......"rotor position" and "dist body location"before removal.
A quick test before installing the "repaired dist" .....plug it in the the truck wiring and turn on the key....DO NOT CRANK THE ENGINE OR YOU WILL LOSE YOUR DIST ROTOR CORRECT POSITION......as you spin the dist by hand .....the injectors should spray.

Posted on Aug 23, 2009

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Do a fresh oil change will lower the HC.

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Change spark plugs,wires,cap and rotor if they are over 24,000 miles
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Make the smog check appointment for the EARLY MORNING. Colder air will help the fuel burn better.

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Clean or change the air filter and pcv valve.

Clean Mass Air Flow sensor with CRC Mass Air flow cleaner or electronic part cleaner.

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Do a quick wipe down on the wires and cap to take the moisture off.

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Check spark plug wire contacts for corrosion.

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Fill the tank to around 3/4.......just in case your fuel pump is weak.

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Ran the truck for 20+ minutes on highway before the test.

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Do not carry excessive cargo on the truck bed.


These are the little things I would do to get the HC and CO down.


Please post more information on the comment window.

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