Question about 1997 Chevrolet Blazer

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I have no spark on occasion--if i pull the coil wire off the coil and leave it just above the coil--it will them get spark and start most of the time but not always like today

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Hi: Sounds like your coil is Bad.Try replacing the Coil Wire 1st.If that does'nt work then I recommend that you Replace your Coil ,Spark Plug Wires,And Distributor Cap And Rotor and Spark Plugs Not knowing when you have tuned your Blazer up last. Look in where the Coil wwire goes to See if you see any Corrosion,Also Check the Coil Wire For Corrosion.Before you Buy all the Tune-Up its I mentioned Above. Your Coil is located inside your Distributor Cap on The Top inside your Distributor Cap Its Secured with 4-Small Bolts.
While you Have Your Distributor Cap Off Inspect the 6 or 8 depending if you have a V-6 or a V-8,To see if they have Corrosion and the Rotor as well. If replacing ALL for a Routine Maintenence which should really be done around 20,000-25,000 Miles Unless you Have Problems Before That Time Line.Make Sure to Inspect ALL of your Wiring Connections.You'll Need to Set your Timing It could vary a litle depending on what engine you Have.Get Specs.In your Maintenece Manual. Use a timing Light Don't Guess. Set your Timing around 4-8 Degrees before Top Dead Center (BTDC) You'll need to Clean Off The Bottom Pulley which is your Harmonic Balancer.Use Engine Degreaser so you can see the Marks on the Damper,Also you'll see a Pointer pointing to Your Bottom Pulley or Harmonic Balancer which is the Same pulley.Mark it with Either a Soap Stick at the 4-8 Degree (BDTC) Also mark The Pointer.Loosen Distributor Hold Down Clamp under your Distributor Bolted to Your Intake Manifold.Just Loosen it Enough to Turn but still have some Resistance and after you have Moved The Distributo Clockwise or Counter Clockwise until you Have Lined Up the Marks you Made on The Harmonic Balancer. Then Be Sure Not to forget to Tighten Your Distributor Hold Down Bracket.Otherwise it will Work its self Back out of Time.Once you have Followed my Solution you Should be Good to Go.Please Let Me Know How my Solution Worked out.I'm Almost 100% sure you'll be Satisfied and you'll have a Even Better Running Vehicle. from d_hubbs at FIXYA

Posted on Jun 05, 2010


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Spark plug or coil likely problem. Might put a spark plug in the #3 wire and crank it over and see if it sparks. Plug will need to be grounded and someone to watch or crank engine for you. Leave original plug in hole while doing this. If you have a timing light. Attach it to the wire with it plugged to the original spark plug and start engine. If the light flashes the the coil and wire has power. If no light then more likely a coil. Depends on year of auto as well. Most of the newer ones have a coil for each plug. If its a older one... likely a plug or plug wire.

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    Remove the top cover on the valve cover concealing the coils. Remove and inspect the spark plugs, and replace as necessary. Start the engine and see if the miss has been eliminated. If the miss is still there, a problem could also exist in the wires or coil or even the fuel injector, which will all need to be addressed as the diagnosis progresses. A fuel injector will cause the same type of a miss if it sticks.

  • 2 Mist the spark plug wires, and watch for evidence of arcing to the cylinder head cover. This will indicate a bad wire. If this is visible, then replace the spark plug wires.
  • 3 Turn the engine off, and loosen the wires at the coil by giving them a twist and pulling them out of the coil. Leave them on the coils--you just want to loosen them a bit to make the next step easier.
  • 4 Start the engine. Using a pair of pliers with insulated handles, pull one plug wire out of the coil at a time and watch for a noticeable drop in engine RPM. The cylinder that has no drop or noticeable decline in RPM is the one causing the miss. Also when the wire is removed, watch for a good spark at the coil to the wire when the wire is held close to the coil. This could indicate a bad coil if the plug wire checks out fine.
  • 5 Check the suspect wire with the Ohm meter, and test for continuity through the wire. If there is continuity, the miss is still present and there is no spark to the wire when it is removed from the coil, replace the coil.
  • 6 Check the fuel injectors. If the plugs and wires are good and there is a spark at the coil to wire test, then checking the injectors is the next step. If this is fine, then a compression test should be done to locate an internal engine problem. Start the engine, and remove the electrical connectors to the fuel injectors one at a time and listen for a significant engine RPM drop. If one cylinder is found to make no difference or very little in comparison to the others, replace the injector.
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    1) First of all check the power and voltage to the battery. With meter it will show exact 12 volt if the battery is charged. If the voltage is less get the battery charged at local auto repair shop. If the battery is internally drained and not getting charged then its time to replace the battery.

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