Question about Crown Fog Light Bulb Jeep Grand Cherokee 98 97 96 95 94 93 Car 4728646

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Check o2and crank sencors

O2 and crank sensors ,I have 11.8 volts to coil and distributor but have no spark from coil

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Try replacing coil and module.

Posted on Nov 15, 2014


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1999 chevy blazer will not start. No spark!?!? No spark from the coil to ground.

Could be a bad coil, bad Ignition Control Module (what controls the ignition coil as commanded by the engine computer), or a bad crank position sensor, or cam position sensor. Or the wiring and circuits to all the ignition parts.
Often it is the crank sensor (CKP sensor)-The pcm must have this information from the crank sensor to determine spark timing. If no good signal from the crank sensor, there will be no spark.

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Since you have replaced all of the parts, perhaps the problem is the wires. Check continuity of critical wires. Are you getting power to the computer, ignition module and coil? Check continuity of wires from computer to ignition module and crank sensor. Check for bent pins and pushed back female terminals in connectors.


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Car will crank there is no spark have replaced coil and condenser

Test the ignition system output, ignition systems can vary in configuration but operate on the same principal. Ignition systems can consist of a coil, pick up coil, crank angle sensor, cam angle sensor, spark plugs, spark plug wires, distributor cap, ignition rotor and a distributor and any variations of these components. An ignition coil is a voltage stepper coil that transforms a low voltage (12 volts) signal into tens of thousands of volts needed to jump the gap of the spark plug.

This coil is activated by an ignition module triggered by using the camshaft/crankshaft angle sensor; timing is adjusted by the PCM (computer).This primary electrical signal is generated by the PCM which calculates spark timing by using a variety of sensors including coolant temperature, mass air flow, and oxygen sensors. Go to for a video on how to check this using a 12v light tool. On the engine repair section search, type, "engine cranks but will not start." If my answer helpe you, please leve good feedback. thanks

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1 Answer

Mazda mvp 03 spark plugs #5 and #6 are not firing. I pull the conector at idle and nothing. Ive cleaned and checked the injectors. New spark plugs. Ive checked fire, fuel and compression. All seems...

no the bad oxygen sensor never affects misfire it affects only the air/fuel mixture
those are causing misfire (a bad coil, ignition module, distributor pickup, crank sensor,).
and i doubt the
crank sensor cuz computer says sensor even if it said to be o2 but no its the crank one its ok if computer fault
i hope my answer was useful

May 30, 2011 | 2002 Mazda MPV

2 Answers

No spark from coil 1991 chrysler labaron v 6

Start by testing the ignition coil primary, and secondary resistance.

To measure the primary resistance, connect an ohmmeter between the positive (+) and negative (-) terminals (the terminals which are connected to the engine wiring harness) on the coil. To test the secondary resistance, connect an ohmmeter between the positive (+) coil terminal and the high voltage cable terminal on the coil. Then, measure the resistance between the positive (+) coil terminal and the coil case; the resistance for the case should exhibit infinite resistance. For coils manufactured by Diamond, the primary resistance at 70-80°F (21-27°C) should be 0.97-1.18 ohms and the secondary resistance should be 11,300-15,300 ohms. Coils built by the Toyodenso company should exhibit a primary resistance at 70-80°F (21-27°C) of 0.95-1.20 ohms and a secondary resistance of 11,300-13,300 ohms. Replace any coil with a new one if it does not meet the specifications.

FAILURE-TO-START TEST Before proceeding with this test make certain that spark has been checked for at the coil. Refer to the ignition coil testing procedures. Failure to do this may lead to unnecessary diagnostic time and wrong test results. CAUTION
Be sure to apply the parking brake and block the wheels before performing any test with the engine running.
  1. Check the battery voltage. It must be at least 12.4 volts to perform the test. If the battery voltage is not at least 12.4 volts, refer to Section 1 for battery charging procedures.
  2. Crank the engine for 5 seconds while monitoring the voltage at the coil positive (+) terminal. If the voltage remains near zero during the entire period of cranking, refer to Section 4 for the On-board Diagnostic checks. The checks will test the PCM and the auto shutdown relay.
  3. If the voltage is at near-battery voltage and drops to zero after 1-2 seconds of cranking, refer to Section 4 On-board Diagnostic procedures. The problem is likely to be related to the distributor reference pick-up circuit to the PCM.
  4. If the voltage remains at near battery voltage during the entire 5 seconds, with the key OFF, remove the PCM 60-way connector. Check the 60-way connector for any terminals that are pushed out or loose.
  5. Remove the connector to the coil positive (+) and connect a jumper wire between the battery positive (+) terminal and the coil (+) terminal.
  6. Using the special jumper wire shown in the illustration, momentarily ground terminal No. 19 of the 60-way connector. A spark should be generated when the ground is removed.
  7. If a spark is generated, replace the PCM with a new one.
  8. If no spark is generated, use the special jumper wire to ground the coil negative (-) terminal directly.
  9. If a spark is produced, inspect the wiring harness for an open circuit condition.
  10. If no spark is produced, replace the ignition coil with a new one.
  1. Check for stored trouble codes, then proceed as follows:
    • Fault code 11 - proceed to the next step.
    • Fault code 54 - proceed to step 6.
    NOTE: Before proceeding, verify that a minimum of 12.4 volts is available from the battery for operation of cranking and ignition systems.
  2. Test the distributor pick-up signal reference circuit as follows:
    1. Turn the ignition switch to the OFF position.
    2. Unplug the distributor pick-up connector.
    3. Remove the coil wire from the distributor cap and have an assistant hold it 1⁄4 in. (6mm) from a good engine ground.
    4. Turn the ignition switch to the ON position.
    5. Connect a jumper wire to the gray (GY) wire terminal and touch the other end of the jumper wire to the black/light blue (BK/LB) wire terminal on the distributor harness connector several times. While performing this, observe the coil wire.
      • If there is spark from the coil wire, proceed to the next step
      • If there is no spark from the coil wire, the problem is in the engine controller or wiring.
  3. Check the power supply to the distributor reference pick-up as follows:
    1. Turn the ignition switch to the ON position.
    2. Connect a voltmeter between the orange wire in the harness connector and a known good ground.
      • If the reading on the voltmeter is 8-9.5 volts, proceed to the next step.
      • If the reading is anything but 8-9.5 volts, check for problems in the circuit between the reference connector and the engine controller.
  4. Check the mechanical operation of the distributor as follows:
    1. Turn the ignition switch to the OFF position.
    2. Remove the distributor cap from the distributor housing.
    3. Crank the engine while observing the ignition rotor.
      • If the distributor rotor revolves while the engine is being cranked over, replace the distributor pick-up coil assembly with a new one.
      • If the distributor rotor did not rotate, inspect the engine for a mechanical fault and repair as necessary.
  5. If fault code 54 (No distributor sync pick-up signal) is being received, or was received before performing this test, proceed as follows:
    1. Turn the ignition switch to the OFF position.
    2. Unplug the distributor pick-up connector.
    3. Connect a voltmeter to the tan/yellow (TN/YL) wire of the harness connector.
    4. Turn the ignition switch to the ON position.
      • If the reading on the voltmeter is at 4 volts, replace the distributor pick-up coil assembly.
      • If the reading is 0 volts, check for an open in the wiring harness between the reference connector and the engine controller.

Jan 30, 2011 | 1991 Chrysler LeBaron

2 Answers

F150 V 8 NO Spark replaced coil / distributor w/

yes!! it can bot make sure the ignition module it good and check the rotor bug

Jan 19, 2010 | 1990 Ford F150

2 Answers

1993 grand am no spark

You said you changed the ecm module, is that the ecm or the ignition module. Do you have access to a scanner to check cranking rpm? That way you can test the new crank sensor and the wiring and the ignition module.

Jan 25, 2009 | 1993 Pontiac Grand Am

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