Question about 1997 Dodge Grand Caravan

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There is no spark at the spark plugs. I replaced the coil an there is no change. I am ready to turn this thing into a bon fire.

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Has a coil pack ?
check to make sure you have power coming to the pack and check your ground

Posted on Oct 06, 2009

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1994 Toyota Camry. I was driving on the hwy at 60mph when it just died. No fire. I had to replace the distributor a few months ago when the same thing happened. I checked the coil and found the primary...


It sounds like you know what you're doing. The two things I did not see covered are: do you have fire at the spark plugs: you checked the efi fuse but I see no indication that fuel to the cylinders has been verified. Have you pulled a spark plug to see if fuel is reaching the cylinders?

Jan 04, 2011 | Toyota Camry Cars & Trucks

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I have a 2001 Focus that is showing a #3 misfire, changed the spark plugs and wires and it is still running rough? What next?


had the same thing with my crown vic on the #8 cylinder. changed plugs and wires. still missing. wound up replacing the coil pack. you can check resistence of the coil between companion spark plug towers. ford marks each tower with 2 cylinder #'s. resisistence should be around 10-12 ohms

Mar 15, 2010 | 2001 Ford Focus

2 Answers

Car will not start.Engine turns over but spark plugs willnot fire


I would say replace ignition coil, that might me the problem, otherwise it can be the ecu, which might have some electrical problems not allowing the car to stay running. Good luck.

Dec 29, 2009 | 1997 Eagle Vision

2 Answers

Code po304 #4 cylinder mis fire


ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

Oct 12, 2009 | 2000 Cadillac DeVille

1 Answer

Motor won't start


You need 3 things for a start condition 1 spark 2 fuel 3 compression. If you have lost spark and have changed wires and coil then you should look at the crankshaft position sensor. This sensor tells the computer when to fire the coil and which plug to fire. Hope this helps. I will check back on the 14th.

May 14, 2009 | 1990 Jeep Wrangler

1 Answer

2.7 l misfire after changing plugs


From karjunkie:

If the plugs get wet, then you have a spark problem somewhere in the ignition system. Pull a spark plug and hold it against a ground while you turn the engine over. You need to see a fat blue spark. If not, check the distributor, spark plug wires and coils. An easy way to test for spark is with an inexpensive spark tester. This is a device that is readily available at most auto supply stores. If the plugs do not fire properly, check the spark plug wires for fraying or cracking. Next, you need to check the coil(s). If firing voltage is low (weak spark), measure the coil primary and secondary resistance with an ohmmeter. If it is out of specifications, replace the coil. Also, make sure the coil is receiving normal voltage from the PCM or ignition module. If it is low, check the charging system for anything that may be reducing alternator output (battery and alternator cable connections, ground connections and voltage output).

Mar 22, 2009 | 2000 Chrysler Concorde

1 Answer

How to change spark plugs 1998 Expedition


Hi Glloyd806

the spark plug gap is .054
This is at best difficult and if not done right can destroy your heads ( about $2700.00). My advice is to have the dealership take the risk. However, If you decide to change the spark plugs yourself you'll need to know a few critical things first.
The 5.4L has aluminium heads, there is a design flaw in that the thread depth is to shallow, only 4 or 5 threads. because of this it is EXTREMELY IMPORTANT to apply anti-sieze on the threads of each spark plug and torque the plugs to NO MORE THAN 14 LBS. Also, if the plugs have been improperly changed before, it is to late, and you will rip the threads out when removing the old plugs.
Still wanting to do it yourself? OK here is how it is done;
Each spark plug has it's own coil, you will need a 8mm socket to remove the retaining bolt. Then disconect the coil wires on the coil. pull out the coil assembly (coil and boot). they may be stuck a little so you may need to wiggle it out. Now you are ready to remove the spark plug. You will need a THIN WALLED 5/8in spark plug socket, at least one extension, and on the #3,4,7, and 8 spark plugs you'll need a universal joint. the holes that the spark plugs are in are machined very thght and I found that I needed to try several different sockets before I found one that would fit inside the hole. Remove the old plug. apply anti-sieze on the threads of the new plug and install. DON'T CROSS THREAD, THERE IS ON SECOND CHANCE! TIP.. replace the old rubber boot with a new one and apply a liberal amount of spark plug moisture protectant gel inside the boot, spark plug end, this will save you from spark plug mis-fire due to moisture in the future. Place the new boot back on the coil and place the coil/boot back into the spark plug hole, it may need some wiggeling. Replace the coil retaining bolt (anti-sieze), reconnect the coil wires. Now do this 7 more times.

In all honesty, take it to a Mechanic, because this is a real pain in the....

Best of luck, and I'm not responsible for any damages you do :(

Lazaruselite

Feb 24, 2009 | 1998 Ford Expedition

2 Answers

1990 Subaru Legacy shorted out the ignition coil. I replaced it and in less than 1 mile,it shorted out the new one.


Subaru engines (including Legacy and engines of many other automobiles, GM, etc.) have returned to so-called wasted spark ignition systems since advent of the electronic distributor-less ignition (having been used historically in early engines with magneto ignitions). With this approach, the ignition systems are less expensive and usually quite reliable. At the same time, however, a shorted spark plug (cracked or carbon clogged, etc.) (or bad ignition spark plug wire) grounds both the ignition spark and the false spark being used. This means that it also grounds the corresponding respective ignition spark of the other 180 degree out of phase cylinder (that uses the same the same coil because the spark current is connected to the spark plugs of two cylinders). Since such a defect allows more current to flow in the spark coil to two plugs when the resistance of the spark plug gap disappears due to a cracked plug, etc, it seems likely to hasten coil burn out if the spark plug/plug wire defect is not corrected before installing the new spark coil.

To explain further, wasted spark means that when a cylinder is ready to fire, it gets a spark to its spark plug while part of the spark (from the same coil and current) as a sort of copy is also sent to another cyclinder at the same time but when the piston in that cylinder is exhausting its ignited gases 180 degrees out of phase from when its spark is needed. When the second cylinder is ready to fire and receives its "spark, the first cyclinder the also receivesa "wasted" spark "copy" of the one needed by the second cylinder. Economy is achieved in manufacture because otherwise electronics would have to turn on and off four different spark coils to distribute four different sparks as needed to the four cylinders. With wasted sparks (which are cheap), because the spark current of one coil is connected (internally in the ignition coil unit) to two cylinders that are in the same position but 180 degrees out of phase in firing, the system can turn on and off two spark coils twice as fast with half the electronics and fire two cylinders that are 180 degrees out of phase. A four cylinder engine thus uses only two coils, a six cylinder engine, three coils, etc., in a wasted spark system.

Jul 27, 2008 | Subaru Legacy Cars & Trucks

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