Question about 1996 Jeep Grand Cherokee

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No spark at plugs

Low voltage at coil 4.0 volts at dist 2.0 volts

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  • 3 Answers

Replace coil packs

Posted on Jul 02, 2013


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Posted on Jan 02, 2017

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SOURCE: 1996 jeep cherokee country willnot start engine turns no spark

First place I'd look is at the crank position sensor.(it is on the drivers side of the bellhousing in line with the flywheel...harness extends up into the rear of the engine near firewall.) Disconnect it at the harness and using an ohmeter, check between the b&c terminals (this should be marked on the connector. Thaer should be no continuity between the two terminals. If there is, replace it. There are other things to look at but it's most common...I'll stay with this till fixed.

Posted on Mar 17, 2009

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SOURCE: 1990 Jeep YJ 6 cyc. Won't Start---No Spark From Coil

It would be great if you could find the Ignition Control Module!!! From my experience on my Jeep...90 YJ 4.2 liter carb. it does not have one...Computer controlled only...

Posted on Sep 10, 2009

SOURCE: my 99 grand cherokee laredo misses at an idle and

You can't answer that kind of question. Have to have the vehicle,know the systems and follow a diagnostic tree to find the problem.

Posted on Apr 30, 2010

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SOURCE: Not getting fire to plug wires. I have replaced

You have spark on the coil wire but not coming from the cap. You replaced the cap right. Did you replace the rotor too. Sometimes the rotor burn in the center and the spark goes right thru it in to the distributor shaft.

Posted on Aug 11, 2010

  • 504 Answers

SOURCE: I have no spark to

there should be 12volts at coil pack

Posted on Feb 28, 2011

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1 Answer

What would cause a coil to burn out on a Mazda Tribute 05 v6

Ignition coils fail due to bad spark plugs or plug wires. Another potential cause is heat and vibration, which can damage the ignition coil's windings and insulation. If an engine is experiencing repeated coil failures, the underlying cause may be resistance from worn spark plugs or excessive spark plug gap. And in rare cases, the failure may be due to a lean fuel condition caused by leaky valves.

With coil on plug (COP) type coils, the rubber insulation dries up (over time and heat from the engine) and cracks and will arc across the engine's metal- shorting out. (Electricity seeks the path of least resistance)

By design, coils take low voltage energy from the battery (12-Volts dc) and transform that energy into a very high voltage charge (in the range of 30,000 to 35,000 volts) to energize the spark plugs which in turn ignites the fuel.

If a spark plug or plug wire is open or has excessive resistance, the ignition coil's output voltage can shoot higher (above the max threshold of 35,000 volts) and burns through the coil's internal insulation, causing a short.

When a coil failure occurs, the coil's voltage output drops, and the engine may not start or may misfire badly when under load.

Extreme caution should be exercised when handling coil packs that are energized- a lethal dose of voltage can arc across the air into the body. So don't touch them when the engine is running!

As stated earlier, if you need to replace the COP, replace the spark plug too, make sure the spark plug is properly gapped.

You can read more about coils here:

Ignition Coil High Voltage Display

Feb 05, 2017 | 2005 Mazda Tribute

1 Answer

Trying to figure out what the name of a part is

That would be the ignition coil, the part that creates spark at the spark plug. If you follow the electrical path from the coil wire to the distributor cap, and from there, the spinning rotor just under the distributor cap carries the path from the coil wire at the cap's center to the spark plug wires around the dist. cap, and through the plug wire to the spark plug.
The high voltage causing the spark is created in the ignition coil by the engine computer at the precise right moment signaling an ignition module to cut 12 volts current to the ignition coil. This causes the coil to internally build up high voltage which is passed through the coil to distributor cap wire. The computer knows the precise right moment to initiate spark from engine sensors, primarily the crank position sensor and the cam position sensor.

Nov 06, 2012 | 1999 Dodge Durango

1 Answer

How to check faulty 6 volt coil

pull the coil wire from the dist cap attach a spark plug to the coil wire make sure the plug is grounded. attach a jumper wire from the - side of the coil turn key on. touch the jumper to any good ground. then remove the jumper from ground every time you do this the coil should emit a spark from the plug if no spark the coil is bad if the plug sparks the coil is good

Mar 26, 2012 | Cars & Trucks

1 Answer

What are the coil packs, is it the plugs?

No, entirely different, although both coils and spark plugs have been around since the beginning of time....well, modern time, or as we might say in montana, horseless carriage time, lol.
A spark plug is a spark plug. Todays are better engineered and designed than the very first working spark plugs, but they look and work just alike. A coil pack (think of a rack with 2, 3 or 4 individual coils attached) is a modern day version of the same coil that has been a fixture on automobiles since the beginning of ( mass production). Same function, same design-only packaged different to accomodate todays distributorless ignition systems, where electronics have taken over many previous mechanical operations, like the distributor, for one. Manufacturers just built bigger and more complex systems around the coil and the spark plugs, or that what makes the internal combustion engine work, you know.
The function of the coil or of the coil pack is to dramatically increase the voltage to the spark plug. Think of it, only 12 volts from the car's 12 volt system enters the coil, but exiting the coil and going to the spark plug is a voltage measured in the thousands, 40 to 60 thousand volts in modern systems, and before electronic ignition when cars used mechanical "points" to make and break electrical contact so the coil would do it's job, the coil output was something around 10,000 volts, still a shocking upgrade as I recall.
Now why is this necessary, you ask? Because the function of the spark plug is to simply provide a path for an electrical current from the coil to jump to ground by jumping a gap at the end of the plug with a spark. The bigger the voltage push, the bigger the spark.
Well, there you go, diego, hope you understand it a little better. I'm no expert, still don't know a lot about electrical theory, and car systems, but you have to learn a little when you can't afford to pay somebody else to fix it.

Mar 25, 2012 | 2000 Honda Accord

2 Answers

What does the ignition coil do?

the ignition coil changes low voltage from the battery (12 volts) to high voltage (about 50,000 volts) to fire the spark plugs and ignite the fuel in the engine cylinders and drive the piston down

Oct 21, 2010 | 1999 Chevrolet Malibu

1 Answer

Where does spark come from coil or dist

The primary voltage signal that produces the spark in the ignition coil comes from the distributor, but the secondary voltage that actually fires the spark plugs does come from the ignition coil, and then it is sent to the distributor usually through a coil wire where it is "distributed" out to the correct spark plug.

Jun 08, 2010 | 1995 Plymouth Acclaim

1 Answer

Firing Order diagram for 2006 Ford Explorer

Hope this helps. The ignition coil:
  • changes low-voltage pulses from the PCM to high-voltage pulses.
  • fires 2 spark plugs simultaneously.
  • has 3 transformers.
    • One transformer fires the spark plugs for cylinders 1 and 5
    • One transformer fires the spark plugs for cylinders 2 and 6
    • One transformer fires the spark plugs for cylinders 3 and 4
Spark plug wires:
  • carry high-voltage pulses from the ignition coil to the spark plugs.
The spark plugs:
  • change high-voltage pulses to spark at the gap, which ignites the fuel and air mixture.
The firing order is 1-4-2-5-3-6.


Jun 06, 2010 | 2006 Ford Explorer

1 Answer

No spark runns fine then loses spark wait 10 minutes starts

The spark plugs receives power to spark from coil pack.Check the power at the coil pack and also check the voltage at the coil pack with meter.If the coil pack shows proper power as well as voltage then its fault in spark plugs.Otherwise its faulty coil pack.The coil pack receives power from also check the voltage of the battery it should be exact 12 volt.
If the battery shows low voltage then the battery needs to be re-charged.
Then check out.
Thanks. you can rate this solution and show your appreciation.

May 20, 2010 | 1992 Pontiac Bonneville

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