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Repeated ignition coil failure - 1993 Jeep Grand Cherokee

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That shouldn't happen...but, I'd check the operating voltage to see if it's overcharging...coil will operate at higher voltage but won't last long. Best voltage should be about 13.5, can go to 14 but that is a bit high. If high, you may have a regulator problem.
If everything else is ok, it may be sustaining heat damage. cure for that is to place a square of aluminum about 1/8" thick between the coil and mount to act as a heat sink,(takes a bit of fabrication) or extend the wiring and move the coil to a cooler location.

Posted on Apr 27, 2010


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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

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I have a 2004 ford explorer and it keeps blowing ignition fuse cant seem to find out why. could someone help me please

An IGNITION coil failure is the most probable cause for a 30 amp fuse (F2-116, CJB) to repeatedly operate... If my drawings are correct you have a coil to check on EACH plug.

"COP" (coil on plug)... ignition system...
A simple resistance check to ground ought to reveal the failing COIL.
using a multi-meter as illustrated below... "Ohm" setting).

Central Junction Box:
Wiper F2 48 CJB ... 10 amp... has no relation to your
30 amp CJB ignition system fuse.

Check the physical connections at the bottom of your steering column... and make sure your battery connections are clean and tight...

Failing any of that you probably have a bad ignition switch as well

Jan 14, 2016 | 2004 Ford Explorer

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Evison: According to " If your vehicle is behaving erratically and you have problems with it running smoothly, it could be showing signs of ignition coil failure. The ignition coil takes power from the generator and relays it to the spark plugs. This ignites the fuel and makes your vehicle run. The severity of the symptoms vary according to which of the ignition coils are failing.
Backfiring If your vehicle is backfiring, this can indicate early symptoms of a failing ignition coil. This occurs when unused fuel is emitted through the exhaust system. If you do not address the issue, you can also do serious damage to your exhaust, resulting in unnecessary and costly repairs. Your exhaust may emit a black smoke and you may even detect the smell of gasoline.
Starting Problems Check your high tension leads (HT Leads). These run between the distributor and spark plugs. Ignition coil failures result in one or more spark plugs not receiving the appropriate amount of charge. If you have trouble starting your vehicle in the cold, this is a good sign of potential ignition coil failure. You can run a simple test on the HT leads to check that there is in fact a spark going from each lead to each spark plug.
Fuel Economy If your vehicle is getting a lot less mileage for the gallon, This can also be a sign of ignition coil failure. When less power is reaching the spark plugs, your vehicle will struggle and use more fuel to compensate for the lack of power transfer.
Engine Misfiring Trying to start your vehicle when the ignition coils fail will result in a rough ride. Your vehicle will cough and splutter regularly and when you drive at higher speeds, your vehicle will jerk and spit. It will also vibrate when you are running idle at a stop sign or intersection.
Vehicle Stalling With ignition coil failure, your vehicle will have irregular sparks emitting to the plugs to keep it running. This will result in stalling. When you bring your vehicle to a stop, it may just shut off totally, thus leaving you needing to restart it.
Coil Failure If your spark plugs are worn out, it forces the ignition coils to operate at a much higher output. Keeping your sparks plug in optimum condition can reduce your chances of having ignition coil problems. Some simple regular maintenance will save you a lot of money in the long run.
If the gap in your spark plug widens due to normal erosion, it leads to an increased voltage being required to create a spark in the chamber. That increased voltage demands more current flow through the primary circuit and this increased current flow can overload the primary transistor. Keeping all these components in good running condition is also a big help towards keeping your coils in a good working condition."

May 25, 2015 | Mitsubishi Lancer Cars & Trucks

1 Answer


Bad pick up coil in distributor. Also. Could be crank sensor that's. Is bad. Or ignition module. ... or it has a bad p,c.m ( brain )make sure all fuses are good and relays

Sep 01, 2014 | Cars & Trucks

1 Answer

92 ford ranger engine code 222

224 - Failure in ignition coil primary circuit (ignition systems.)

223 - Dual plug (DPI), SPOUT or IDM circuit fault. (Ignition systems.)

222 - IDM open or high or right coil pack failure. (Ignition systems.)

218 - IDM signal open or high or left coil pack failure. (Ignition systems.)

Mar 29, 2014 | Cars & Trucks

1 Answer

I have a 94 F350 with a 460 that keeps shorting the pick-up coils out. This is number 5 that I have put in. Can you tell me what may be causing this?

Your truck does not have a pick up coil. It has a hall effect switch in the distributor. Are you referring to the TFI module on the driver's side of the engine compartment/ inner fender. The Thick Film Integrated Ignition Modules TFI's were notorious for overheating and failing when they were mounted on the distributor body. Ford relocated them to the inner fender in a finned aluminum heat-sink to keep them cooler and last longer. Usually the cause of failure is an ignition coil that is shorting-out or drawing too much current. This will cause premature or repeat failure of the ignition module (TFI) and is often missed by most technicians because replacing the module gets the vehicle going again, for a while, as you know.

Dec 08, 2013 | Cars & Trucks

1 Answer

2005 Mercedes Benz C230 Kompressor - Mileage: 110,000+ Experiencing repeated failures with replacement Ignition Coil Packs - failures have occurred at Cylinders 1, 3 and 4. Cylinder 2 still carries...

Try leaving the dress up cover over the coil packs off. It may be engine heat. Also check alternator voltage is not over 14.6 volt when engine running at fast idle. You are not alone with this problem.

Oct 20, 2013 | Mercedes-Benz C230 Cars & Trucks

1 Answer

Multiple Ignition coil failure w/ On-board computer failure

This is a common problem on most Ford products since around 1998. The issues is mostly with the COP--Coil-On-Plug. Their individual coils for eack spark plug,vs. a single coil pack or distibutor and wire type system. Now the good part. With all of fords problems, ALL MFG's use this type system,Nice move.
The coil driver failure, shouldn't be a wide spread issue
Forget recalls?

You saw Nissan ,recall issues,back to 2004 thru 2008,once Toyota had the gas peddle issues. If it wasn't for Toyota,they were laying low. Everyone new there were problems. Same thing on Chevy Colorado,Etc

May 09, 2010 | 2005 Ford Escape

1 Answer

Multiple Ignition coil failure w/ On-board computer failure

to beds_borders

That sounds very familiar. Our 2005 Ford Escape just had about the same problem to the tune of a $2800 repair. Computer failure caused two iginition coils to fail and had to drive over the Continenetal Divide on 4 cylinders. The vehicle is only 5 years old. Happened about 3 weeks ago. Ford said there is no recall. I have a big problem with that.. Where is the "quality" they are trying to sell?

Mar 24, 2010 | 2005 Ford Escape

1 Answer

1999 ES300 - Repeated Ignition Coil Failures

The coils are probably all the same age and if one goes it is not unusual for the others to follow. Oxygen sensors fail routinely. Some at 15K some at 115K. The failures you have describe for the most part are unrelated to each other.

Jul 12, 2009 | 1999 Lexus ES 300

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