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97 GMC With 350 V/8 has spark at coil, no spark at plugs

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Sounds like the contacts on the distributor cap are worn replace the cap and see if that fixes the problem and if the spark plug wires are old id replace those to

Posted on Nov 27, 2012


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Posted on Jan 02, 2017

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SOURCE: GMC 2500 P/U 350 Vortec.. Installed rebuilt

Have you checked to see if your distributor is aligned properly? I just had to change out a distributor on a 1997 GMC 3/4 ton that has the V8 Vortec in it as well and you need to pay attention to the (2) numbers around the mating surface / rim of the distributor. You should see a number 8 and a number 6. You need to find TDC on your number 1 cyl. You can either slowly crank the motor over or turn the motor over with a ratchet and socket on the bolt securing the main pully to the crank while another person places their finger over the spark plug hole and when it just starts to Stop pushing air out past your finger then stop. Is the rotor aligned with the number what ever size engine you have in your truck (i.e. 6 or 8)? If not then your timing is off. You will need to remove the distributor and rotor, then install your rotor (before re-installing the distributor) and align the rotor pointer with either the number 8 or 6 stamped on the lip of the distributor where the cap sits down and creates the seal. I have found that they run both numbers on the distributor because they use the same distributor in both the V6 and V8 Vortec motors or a least the plastic base of the distributor. There will be (2) numbers here and sometimes hard to see. Align the pointer with what size engine you have and lower the distributor down into the hole. If the end of the shaft starts to turn the rotor as it aligns with the oil pump causing the pointer to no longer be pointed at the number that indicates which engine this is being installed in then you need to remove the distributor and look down into the hole where the distributor goes in and you'll see the end of the oil pump shaft with a slot (perfect for a big flat head screwdriver) staring back up at you. You'll need to insert a long shanked large flat head screwdriver down into the hole and turn the slotted oil pump shaft until you can successfully lower the distrubutor into place and not lose your mark. I also found that you'll need to have to pointer of the rotor a bit retarted from where it is suppose to be. This is because the distributor shaft gear is swirled and will cause the rotor to turn as it finds its mark, aligns and lowers down into a seated position. When it is seated and the rotor has stopped turning it should be pointing at the indicated cylinder Stamp in the lip that is your size motor (V6 or V8). Now it should be on time. The computer will take care of advancing and retarding.

If not the timing, then I would also consider that you may have a bad crank shaft sensor. These are merley suggestions because there is no more to go on than what you've submitted.

Posted on Mar 29, 2009

  • 1 Answer

SOURCE: 97 gmc sierra no fuel no spark replaced ign module

1996 GMC 1500 Pickup.
Replaced Coil, Dist cap/Rotor, Ign Mod & pick-up.
All showed to be bad with OHM meter.

20A ECM-B fuse keeps blowing out and I'm afraid to burn these new parts up....


Posted on May 19, 2009

  • 499 Answers

SOURCE: chevy 350 no spark

check if the wires ends isn't corroded try to clean it if it corroded or not also try to determine its resistance by using th multimeter and check its resistance (wire resistance) try this link

Posted on Jun 11, 2009

  • 10319 Answers

SOURCE: 94 gmc sonoma 4.3l vortec new coil, plugs, wires

The ignition module in the distributor is what you need to give the engine spark to the plugs. It senses signals from the PCM to regulate the spark control and this item is the part that took over the old style point & condensor type ignitions. It is time for a new one in your truck

Posted on Apr 17, 2010

  • 3113 Answers

SOURCE: 1997 GMC Sierra with 350 what is spark plug gap?


Posted on Jan 17, 2011

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98 Chevy 2500 350 vortex won't start it will hit but won't start put cam sensor and coil and changed the spider to a used one was taking out of running truck crank sensor 72lb of fuel pressure

I own a '97 GMC Safari, I don't know if yours has the same connector to the fuel pump, but mine has a round electrical plug just in front of the gas tank that has given me a lot of trouble. The fuel pump starts, comes up to pressure, then the vibration of the engine starting causes the plug to lose a connection, and the engine then dies. I pull on the plug, and it runs normally. If you have that plug, pull it apart and pay close attention to the center pin.

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Cylinder 3 misfiring on a 97 gmc jimmy 4wd. Did a tune up about 2 months ago (ignition, wires, coil, spark plugs), replaced fuel pump last week, used fuel injector cleaner, still no luck...any ideas?

go back and check all the plugs, wires and the total tune up. check your firing order, and timing. put a timing lite on the plug wires and if the plug is bad it will show with the light. lol.

Oct 05, 2015 | GMC Cars & Trucks

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My 97 jimmy has a no run tested coil have power to coil but no spark at the plugs any help would be great

Check the coil wire for spark at the distributor cap. If you have spark there, check the rotor button and the cap for corrosion or failure.

Jan 25, 2011 | 1997 GMC Jimmy

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I havea 97 silverado with a 350 vortec in it. im haveing a hard time starting it up. the eng. turns,has fuel presure,and has spark at the plugs.but the spark on the plugs is a orenge color not a bright...

Hello. I can assist you. You need to get your truck on a scanner. You can have this done at a dealership or at many autoparts stores, often auto zone [for instance]. the scan will isolate the problem so that it can be solved.

Nov 02, 2009 | 1997 GMC Sierra

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No spark at coil

Check the ignition switch located on the steering column under the dash. If you do not hear an electric contact click when you turn the key on, this could be the problem

Oct 01, 2009 | GMC Sierra 1500 Cars & Trucks

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In what order do yu arrange the plug wires on the distributor cap or a 1990 gmc 350

1-8-4-3-6-5-7-2 Distributor turns clockwise Number one should be in the 5 oclock position. You should be able to draw an imaginary straight line between the coil tower and number one tower on the cap and the number one spark plug.

May 15, 2009 | 1990 GMC Sierra

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No spark but turns over replaced ignition module,coil,ecm

could be in the crank position sensor

just a thought shack

Apr 18, 2009 | 1995 GMC Sierra

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check the ecm fuse and power wire from starter

Feb 01, 2009 | 1997 GMC Sierra

1 Answer


Go to a library that has a set of the factory service manuals (not Chlton's or Haynes or Motor's). The FSM's will give you all the trouble hotting charts that the dealer techs use.

Feb 01, 2009 | 2007 GMC Sierra 1500

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