Question about 1998 Chevrolet Blazer

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I have no spark at any plugs,1998 blazer 4.3. there is spark going to the distributor I replace cap & rotor but nothing.

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Well if the module is good then you have a bad rotor new isn't always good

Posted on Jul 13, 2010

  • rachel stephens Jul 16, 2010

    well if the rotor is bad the they should exchange it free of charge and yes it would be adviseable to check the old module while at a parts store autozone usually has these machines but that only works if you can get to the parts store. now if your like alot of people, trips to the parts store to check old parts while the car is broke aren't practical the do you have access to a timing light? and before you go too far you will need to verify the distributor is spinning with the engine and your timing chain is not broken or out of time.then you will have to verify if you have spark at the coil,then verify if you have spark at the wires (this is where a timing light saves time) if you have acces to ignition testers then using them would help if not well you will have to find where the ignition system has failed ,check all connections to make sure they are clean and dry.usually a module will give signs it is failing like miss firing or hard to start while hot and i have actually gotten bad rotors before on quite a few occasions as i said new is not always good after all if you have an ohm meter and could use a manual to diagnose your spark problem you would not be here now would ya

  • rachel stephens Jul 16, 2010

    here is a way to verify timing To get #1 compression remove plug and put your finger in the hole and have someone crank the engine until you feel your finger being pushed off by the air pressure. Now line up the timing mark.

    Rotate the number 1 cylinder to Top Dead Center (TDC) of the compression stroke.

    Align white paint mark on the bottom stem of the distributor, and the pre-drilled indent hole in the bottom of the gear (3).
    Notice: The ignition system distributor driven gear and rotor may be installed in multiple positions. In order to avoid mistakes, mark the distributor on the following components in order to ensure the same mounting position upon reassembly:

    • The distributor driven gear

    • The distributor shaft

    • The rotor holes

    Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition. Premature engine wear or damage may result.

    Notice: Installing the driven gear 180 degrees out of alignment, or locating the distributor rotor in the wrong holes, may cause a no-start condition. Premature engine wear and damage may result.

    With the gear in this position, the rotor segment should be positioned as shown for a V6 engine (1) or V8 engine (2).
    - The alignment will not be exact.

    - If the driven gear is installed incorrectly, the dimple will be approximately 180 degrees opposite of the rotor segment when it is installed in the distributor.

    Using a long screw driver, align the oil pump drive shaft to the drive tab of the distributor.
    Guide the distributor into the engine. Ensure that the spark plug towers are perpendicular to the centerline of the engine.

    Once the distributor is fully seated, the rotor segment should be aligned with the pointer cast into the distributor base.
    - This pointer may have a 6 cast into it, indicating that the distributor is to be used on a 6 cylinder engine or a 8 cast into it, indicating that the distributor is to be used on a 8 cylinder engine.

    - If the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more.

    - If this is the case, repeat the procedure again in order to achieve proper alignment.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    Install the distributor mounting clamp.

    Tighten the distributor clamp bolt to 25 N·m (18 lb ft).

    Install the distributor cap.
    Install two NEW distributor cap screws.

    Tighten the screws to 2.4 N·m (21 lb in).

    Install the electrical connector to the distributor.
    Install the spark plug wires to the distributor cap. Refer to Spark Plug Wire Harness Replacement
    Important: If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.
    Repeat Installation Procedure 2 for proper distributor installation


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If you changed the modual already,...pull the coil and take it to napa or kragen. Somewhere where they test. There is a specific test you can perform with an ohms read. I don't know the numbers but it's a winner. If your numbers are within the set, specific varience for that coil, youl know for sure without having to buy another expensive part you don't really need.

Posted on Jul 16, 2010


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Since you didn't state whether it is a V6 or V8, I'll give you both.

V6 -4.3Liter
Firing Order is 1-6-5-4-3-2
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->Passenger side, spark plug order in engine,
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If it's Electronic, the distributor cap has a Left side, (Drivers side), and a Right side, (Passenger side)
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Number 1 spark plug tower on distributor cap,
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Starting from Front going back on Drivers side,
Starting from Front going back on Passenger side,

Spark plug order in engine, starting from Front going back, Drivers side:
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