Question about 1987 Porsche 944

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I grounded out the negitive side of the coil to the negitave battery cable. Now engine will not start. Coil has been replaced and still will not get spark. What else could we have fried?

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The electric part of the ignition

Posted on Mar 19, 2011

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2 Answers

2000 Kia Sportage ECM ECU Bad?


Check the pcm ground pins to make sure they are grounded. 6, 28, 34, and 55.


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Jul 23, 2017 | 2000 Kia Sportage

2 Answers

I have a Triumph Spitfire MK2 1965. How do I tell if it is a pos gnd or neg gnd


Easiest way is to follow the battery cables. if the Negitave (-) goes to the engine block , frame or body, that is a negitive gorund system. If the Positive (+) does, it is a Positive ground system.

Mar 23, 2011 | Triumph Tr 7 Cars & Trucks

1 Answer

My 92 dakota is not getting any spark


Engine Fails To Start

The "Checking For Spark'' test should be performed prior to this test.

This is a basic test of the ignition system that systematically examines the battery, the coil, the engine controller, and its wiring harness and connections; the most likely culprits in a no-start condition at this stage.
88472304.gif

Fabricate this special jumper with a 0.33 MF capacitor in-line to test the ignition coil
Click to Enlarge

  1. Unplug the ignition coil harness connector at the coil.
  2. Connect a set of small jumper wires (18 gauge or smaller) between the disconnected harness terminals and the ignition coil terminals.
88472314.gif

Terminal locations on the engine controller 14-way connector-1989 models
Click to Enlarge 88472305.gif

Engine controller 60-way connector-relevant terminals for testing are shown numbered
Click to Enlarge

  1. Attach one lead of a a voltmeter to the positive (12V) jumper wire. Attach the negative side of the voltmeter to a good ground. Measure the voltage at the battery and confirm that enough current is available to operate the starting and ignition systems.
  2. Crank the engine for five seconds while monitoring the voltage at the coil positive terminal:
    1. If the voltage remains at zero, diagnosis of the fuel system should be performed. Also check the engine controller and auto shutdown relay.
    2. If voltage is at or near battery voltage and then drops to zero after one or two seconds of engine cranking, check the engine control module circuit.

WARNING

The ignition must be turned OFF prior to unplugging the engine controller connector. If it is not, electrical surging could occur causing damage to the unit or other electrical components in the vehicle.

  1. If the voltage remains at or near battery voltage during the entire five seconds, turn the ignition key OFF. Remove the 14-way connector on 1989 models, or the 60-way connector on 1990-96 models at the engine controller. Check the 14-way or 60-way connector for any spread terminals.
  1. Remove the test lead from the coil positive terminal. Connect an 18 gauge jumper wire between the battery positive terminal and the coil positive terminal.
  2. Make a special jumper cable (see illustration). Using the jumper MOMENTARILY ground terminal 12 on the 14-way connector (1989), or terminal 19 (see illustration) of the 1990-96 60-way connector. A spark should be generated at the coil wire when the ground is removed.
    1. If a spark is generated, replace the engine controller computer.
    2. If no spark is seen, use the special jumper to ground the coil negative terminal directly. If spark is produced, repair the wiring harness for an open circuit condition. If spark is not produced, replace the ignition coil
    this is for distributor ignition
THIS IS TESTING OF DISTRIBUTORLESS IGN
Testing

This procedure requires an ohmmeter to test the coil packs for primary and secondary resistance (specifications are given for an ambient temperature of 70-80°F/21-27°C).
88472320.gif

The two coil packs contain five independent coils, which fire paired cylinders (shown numbered)
Click to Enlarge

  1. Disconnect the negative battery cable.
  2. Determine the manufacturer of the coil. It should be labeled either a Diamond or Toyodenso.
88472779.gif

Location of critical terminals for checking the coil primary resistance-V10 engine front coils
Click to Enlarge 88472780.gif

Location of critical terminals for checking the coil primary resistance-V10 engine rear coils
Click to Enlarge

  1. Check the secondary resistance of each individual paired coil by connecting an ohmmeter across the coil towers. This must be done between the correct cylinder pairs: 3/2, 7/4, 1/6, 9/8, or 5/10. Resistance for a Diamond coil should be 11,300-15,300 ohms. For a Toyodenso manufactured coil pack, resistance should be 11,300-13,300 ohms.
88472323.gif

Use an ohmmeter to check secondary resistance as shown

  1. Check the primary resistance of the front coil pack by attaching an ohmmeter between the B+ coil terminal and either the right (cylinders 3/2), center (cylinder 7/4), or left coil (cylinders 1/6) terminals. Resistance for a Diamond coil should be 0.97-1.18 ohms. Resistance for a Toyodenso coil should be 0.95-1.20 ohms.
  2. To test the primary resistance of the rear coil pack, attach an ohmmeter between the B+ coil terminal (see illustration) and either the right (cylinders 9/8), or left (cylinders 5/10) coil terminals. Resistance for a Diamond coil should be 0.97-1.18 ohms. Resistance for a Toyodenso coil should be 0.95-1.20 ohms.
i hope this helps any more questions repl if help at all plz vote or comment me

Jan 17, 2011 | 1995 Dodge Dakota

1 Answer

No spark in engine


Replace the coil wire. If thats not it? Is the coil wet? if it is? Its bad. Ignition module might be bad.
Make sure your getting power to the positive side of the coil when you turn the key on. Use a test light to ground from battery and probe to positive ignition wire going to the coil. The test light should go on when the key is on. If it does light? Your problem has nothing to do with anything inside the vehicle. Make sure all grounds are clean and tight in the engine compartment. if you have no response from the positive side or the coil ignition wire? Jump a wire with alligator clips one side to the positive on battery and the other on the positive side of the coil. Then try starting it. If it starts now? You have a broken wire some where between the coil and the ignition switch. I have had to replace a whole steering column because of this and it worked. but do all the cheaper stuff i had listed above .
Thanks i hope i helped with diagnosing with you.
Please leave me a good comment or feed back on here.
Thanks

Jan 08, 2011 | 1992 Chevrolet S-10 Blazer

1 Answer

Truck won't start


could be bad ground?get a set of good booster cables and put ground cable to battery, and other end to good ground on engine.
try that.
you can also hook red booster to + on battery, and other end to big nut on starter.[BE VERY CARFULL ON STARTER NOT TO GROUND + CABLE WHEN PUTTING ON...........USUALLY VERY TIGHT AROUND STARTER].....IF YOU TRY SECOND METHOD PUT CABLE ON STARTER FIRST AND THEN TO BATTERY.IF + SIDE HITS GROUND THERE WILL BE LOTS OF SPARKS,REMOVE IMMEDIATLY.
try ground first,if ok you have bad ground wire connection somewere.
be very carefull with + side.

Dec 19, 2009 | 1989 Chevrolet C/K 2500

2 Answers

MY 2005 DODGE DURANGO WILL NOT START UNLESS IT IS JUMPED. THE BATTERY POWER WAS TESTED AT ADVANCED AUTO. ACCORDING TO THE SALES REP, THE POWER WAS GOOD (450 OUT OF 600). WHAT COULD BE THE PROBLEM?


450 out of 600 what? sounds like you have somthing drawing power need an amp meter. remove key and leave window down. disconnect negitive battery cable and connect meter between the negitive cable and negitive termainal on the battery should see around 2.5 milliamp draw or less may take 1/2 hour to get to this point. also if this vechile is not driven often this could be the problem

Aug 23, 2009 | 2005 Dodge Durango

1 Answer

How do you test ingition coil


disconect coil completley find the positive on the coil conect it to the positive on battery colil output should be close to a good grounding surface or a coil lead plugged into the coil tower and the other end of coil lead very close to a ground surface then attach a wire to the negative side of coil ready?....making sure coil output is close to a ground surface or the coil lead is very close to a ground surface take the wire u just conected to negitive side of coil and hold it on the ground side of battery for about 1-1.5 seconds and release and the coil should fire as u release the wire from neg side of battery

Jun 28, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

My nissan


If you have a 12 volt test light put the point on the positive lead to
the coil and the ground lead to a good ground ( Negitive side of battery ). Then turn the key on. If the test light comes on then you have power to the coil. With power to the coil confirmed have someone crank the engine and put the test light on the negitive side of the coil. The light should flash at a rapid steady rate. If not then your pickup in the distributor may be bad. If no power to coil with key on or when cranking you may have a bad ignition switch.
Another way to test for spark is to remove the coil wire from the dist cap and hold the end close to a ground ( 1/4 inch away) and
have some one crank the engine. If you get a good spark but no
spark to the spark plugs you may have a cracked dist cap or a bad rotor. If no spark at coil wire use a wire in place of the coil wire to check for spark. You may have a bad coil wire. Good luck. Neil W.

Dec 24, 2008 | 1983 Nissan Pulsar

1 Answer

Fuel problem


on the negitive battery cable there is also a small black wire this is you fuel ground make sure this had a good connection the the negitive side of the battery.

Sep 16, 2008 | 2006 Ford Ranger

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