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Module overheating and cuts engine

VW Fox 1998 1.6l Electrical module overheats within two to three km and cuts engine. I have tried replacing the module and the coil three times, checked the plug and spark leads, run the car on only battery i.e. alternator disconnected ( so no overloading problem from alternator) Still Clueless!

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  • 33 Answers

Start going through all of the body and engine grounds. look for any that are corroded or loose. Had a similar issue on a domestic vehicle. It had been at the body shop post my wife wrecking the car. The body shop left half the grounds off or loose. The thing was going nuts. Spent two days looking in, under, and around the enngine bay and found a body ground off on the lower firewall. The car went right back to normal as soon as I re-attached that one body ground.

Posted on Nov 28, 2013

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6ya6ya
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Posted on Jan 02, 2017

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Ajkill
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SOURCE: IGNITION FAILURE ON 280 ZX (82)

  1. Turn the ignition switch OFF. Disconnect the fusible link connector for the fuel injection wiring harness. Be sure the ignition is OFF before doing this. Disconnect the cold start valve wiring harness connector. Disconnect the high tension lead (coil-to-distributor) at the distributor and hold it 0.13-0.25 in. (3.3-6.3mm) away from the cylinder head with a pair of insulated pliers and a heavy glove. When the engine is cranked, a spark should be observed. If not, check the lead and replace as necessary. If there is still no spark, go on with the following system checks.
    1. Make a check of the power supply circuit. Turn the ignition OFF. Detach the connector from the top of the IC unit. Turn the ignition ON. Measure the voltage at each terminal of the connector in turn by touching the probe of positive lead of the voltmeter to one of the terminals and touching the probe of the negative lead of the voltmeter to a ground, such as the engine. In each case, battery voltage should be indicated. If not, check all of the wiring, the ignition switch and all connectors for breaks, corrosion, discontinuity etc., then repair as necessary
    2. Check the primary windings of the ignition coil. Turn the ignition OFF. Detach the harness connector from the negative coil terminal. Use an ohmmeter to measure the resistance between the positive and negative coil terminals. If resistance is 0.84-1.02 ohms, the coil is OK; replace it if the reading is far from this range.
  2. If the power supply, circuits, wiring and coil are in good shape, check the IC unit and pick-up coil as follows:
    1. Turn the ignition OFF.
    2. Remove the distributor cap and ignition rotor.
    3. Using an ohmmeter, measure the resistance between the two terminals of the pick-up coil, where they attach to the IC unit. Measure the resistance by reversing the polarity of the probes. If approximately 400 ohms are indicated, the pick-up coil is OK, but the IC unit is bad and must be replaced.
0900c152800716f1.jpgFig. 10: Connect the ohmmeter to the pick-up coil terminals-1979-83 models 0900c152800716f3.jpgFig. 11: Remove the screws (arrows) to detach the IC unit-1979-83 models
  1. If the resistance is other than 400 ohms, proceed with the following:
    1. Be certain the two pin connector to the IC unit is secure.
    2. Turn the ignition ON.
    3. Measure the voltage at the ignition coil's negative terminal.
    4. Turn the ignition OFF.
WARNINGRemove the tester probe from the coil negative terminal before switching the ignition OFF, to prevent burning out the tester.
    1. If 0 voltage is indicated, the IC unit is bad and must be replaced.
  1. If battery voltage is indicated, remove the IC unit from the distributor, by proceeding as follows:
    1. Disconnect the battery ground (negative) cable.
    2. Remove the distributor cap and ignition rotor.
    3. Disconnect the harness connector from the top of the IC unit.
    4. Remove the two screws securing the IC unit to the distributor.
    5. Disconnect the two pick-up coil wires from the IC unit.
WARNINGPull the connectors free with a pair of needlenose pliers. DO NOT pull on the wires to detach the connectors.
    1. Remove the IC unit.
  1. Measure the resistance between the terminals of the pick-up coil. It should be approximately 400 ohms. If so, the pick-up coil is OK and the IC unit is bad. If the resistance is other than 400 ohms, the pick-up coil is bad and must be replaced.

Posted on Oct 13, 2008

  • 1 Answer

SOURCE: ENGINE TURNS OVER BUT WON'T FIRE

Are you getting a check eng lite? you may have a crank or cam position sensor not picking up correctly.

Posted on Jan 22, 2009

  • 35 Answers

SOURCE: cobalt no spark

I was going to say crank sensor, but you changed it. What have you done to it latley? Or did this just start? I kinda want to say PCM for some reason. Any welding done on the car latley?

Posted on Feb 26, 2009

  • 15 Answers

SOURCE: No spark at coil

check and clean the points if it has them. under the rotor in the cap

Posted on Jun 03, 2009

  • 316 Answers

SOURCE: My 1999 saturn sl2 will

Sounds like a bad timing chain.

Posted on Jun 21, 2009

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