Question about 2004 Ford Escape

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Is there a way to check if a coil pack is good or bad by connecting an ohm meter to it?

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You can use a standard ohm meter, set the scale to 20K ohms and take a reading between the front spring (located inside the rubber insulator) and either one of the contacts on the top side. If the COP is good it will give you a closed contact reading. If the COP is bad it will be open.

Posted on Jan 03, 2011


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Posted on Jan 02, 2017


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I have a 2007 Saturn ion 2 .I have replaced the coil packs the spark plugs the mass air flow sensor. Iam still getting a check engine light and it runs rough at low idle speeds. Please help.

Have your fuel injectors ohm meter tested for a dead one. You can do this yourself with an ohm meter. Just unplug each injectors electrical connection plug and touch the leads to the pins for a reading. the bad one will be a much lower reading of the rest. Keep track of reading on each cylinder. Replace the dead injector.

Aug 14, 2017 | Saturn Ion Cars & Trucks

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I can be driving down the road and My Honda just cuts off, it feels like it is running out of gas

More deatails are needed. how old is car, what other signs ar u having before car cuts off, sounds lik starving for fuel or water in gas, what have you tried that may be quicker

Sep 01, 2014 | Cars & Trucks

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2004 Saturn, "L" series, 3 liter V-6. po300,

300 is random misfire and 306 is cylinder #6, I would check the coil pack on #6. If it has separate coils per cyliner, swap the coil, see if the misfire goes to that cylinder. If it does replace the coil.
If it has three coil packs you can still swap the coils. If that doesn't fix your problem, then you will have to check the injector with an ohm meter. resistance between the prongs should be between 11 to 15 ohms. check another injector and they should be relatively close. Let me know
Good luck

Nov 09, 2010 | 2004 Saturn L-Series

1 Answer

I am trying to replace the igniyion coil but i dont know which one is bad

  • Unplug the spark plug wires from the coil and label the wires if necessary for proper installation.
  • 4 Unplug the pack's electrical connector and remove the coil pack from the engine, using a wrench or ratchet and socket if necessary. If your coil pack is mounted on the back of the engine, raise the front of the vehicle and safely support it on two jack stands to reach the coil pack from underneath the engine.
  • 5 Set your ohmmeter to the 20000 ohms range. Turn on your meter and touch the spark plug wire terminals on one of the coils with the meter leads. You may get a reading between 5000 to 15000 ohms, depending on your particular model. This checks the secondary resistance.
  • 6 Set your ohmmeter to the 10 ohms range, and touch the terminal B+ (usually the center prong on the coil pack electrical connector) with one of the meter test leads, and touch the corresponding coil prong on the electrical connector with the other test lead. You may get a reading between 0.3 and 1.0 or more, depending on your particular model. This checks the primary resistance on each coil.
  • 7 Repeat steps 6 and 7 for each coil in the pack assembly, and compare your resistance readings to the specifications given on your vehicle service manual (see "Tips"). If your readings are out of range, replace the coil or coils as necessary.

  • Read more: How to Check Coil Packs With a Voltage Meter '

    Oct 28, 2010 | 1997 Toyota Tercel

    1 Answer

    How do you tell if the coil packs are bad

    With an OHM meter to check the resistance

    Contributing Member
    Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805 im_aim.gif So you got codes P0300, P0304 and P0305

    You need to check primary and secondary resistences, not just primary as you did.
    Primary = 0.67 - 1.05 ohms (You may have a bad multi meter if all read the same)
    Secondary = 9.3k - 16k ohms Contributing Member
    Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805 im_aim.gif So you got codes P0300, P0304 and P0305

    You need to check primary and secondary resistences, not just primary as you did.
    Primary = 0.67 - 1.05 ohms (You may have a bad multi meter if all read the same)
    Secondary = 9.3k - 16k ohmsSo you got codes P0300, P0304 and P0305

    You need to check primary and secondary resistences, not just primary as you did.
    Primary = 0.67 - 1.05 ohms
    Secondary = 9.3k - 16k ohms

    Jun 29, 2010 | 2000 Chevrolet Blazer

    1 Answer

    Stalled while driving, now will not start and run.

    check with inline spark tester between the coil and the plug wires for fire. also check the sparkplugs for a fouled out condition. if all checks out then check the coil with ohm meter. unplug the ignition wire connector from the coil. there should be 3 terminals on the coil. connect the ohm meter to the center pin and the other to either outside pin to check primary resistance. then using the ohm meter check the secondary resistance by connecting one end of ohm meter one tower on coil and the other end of ohm meter across to the opposite side of coil to check resistance. primary resistance--0.95- 1.20 ohms secondary resistance-- 11,300 to 13,300 ohms. if it does not check out then replace the coil.

    Apr 12, 2010 | 1999 Dodge Ram

    1 Answer

    Number one cyl on coil pack not firing, all others are, codes reads misfire on 1 cyl should i replace the coil pack and how do you test the pack

    Check the spark plug first. then if the plug is good you wil need a digital ohm meter to test the coil pack. if you need to know how to remove the coil pack let me know, to test put on ohms should not have more than 2 1/2 ohms restance betweent coil lead to coil connector. If you test the coil pack on both sides of the pack and get a reading then the coil is bad, if it does not read then you haave a bad fireing plate diode.

    Mar 12, 2010 | Ford Explorer Cars & Trucks

    1 Answer

    How can i check my coil pack on a 1998 f 150 4.2

    measure resistence between companion outputs. they should be marked on the coill pack.12 ohm nominal. mesasure the resistence of the input terminal. 3 ohm nominal. i recently had a coil pack go bad on a '97 crown vic where the number 8/2 tower was reading good resistence when i kept the meter probe steady. if i moved it around while still making contact, it would change. i was getting a cyl. 8 misfire and found a bad wire and the plug was worn funny, so i changed the plugs and wires. this did not fix the underlying problem. the bad coil pack. the vehicle was misfiring at cruise but upon acceleration no misfire was apparent. what are the symptoms the truck is displaying

    Mar 04, 2010 | 1998 Ford F150 Regular Cab

    1 Answer

    Misfires at all engine speeds

    First start by checking to see if the spark work and do not have a bunch of junk built up on them. If they do, clean them with a wire brush or replace them if they are real bad. If they do not, check the gap on the spark plugs to make sure that it is gapped right for the specific car. If those were not the problems take your spark plug wires off and use an ohm meter to check the resistance of the wires by putting the positive and negative wires of the meter on the ends of each wire. If one or a few of the readings are far from the rest you should try replacing the wires. BE SURE TO PUT THE WIRES BACK ON IN THE ORIGINAL ORDER. If all plugs and wires are fine check the coil packs to be sure they are working. Pull one wire off of the coil pack and have some one hold a grounded, WELL INSULATED wire close to, but not touching, the part the wire snaps on to the coil pack. Turn the engine over to see if it sparks. KEEP HANDS AWAY FROM COIL WHILE TESTING. Believe me it doesnt feel good to get shocked. I know from experience. Do this for each wire on the coil packs. If one does not spark do then the coil pack is bad and needs replaced. If you have a car with a distributor pull the distributor cap off and check for cracks. If its cracked it needs replaced. This is as far as i have ever had to go so i hope it works. Good luck.

    Jun 28, 2009 | 2000 Renault Sportwagon

    1 Answer

    2003 Hyundai Accent with Engine skip...error code P0300 P0301

    I have seen coil packs go bad on several Hyundai Accents, the coils will do exactly what they are supposed to (hence your check with an ohm meter), however, the coils short through the outer casing. Try running the car when it is dark out and spraying the coil packs with water. Listen for clicking and watch for arching from the coils to any metal around them. Look for abnormal detonation marks in the outer casing. My guess is you just need a set of new coils. If the Problem is worse in the rain then you have found your problem. Remember, If your car has been misfiring (as noted by the engine codes you listed), the EGR valve can become clogged and damage can be done to your catalytic converter as unburned fuel detonates inside it (keep an eye out for O2 codes in the future). Also, your new plugs can become fouled, be sure they are clean once you fix the problem. Checking your plugs can also be a useful indication of which cylinder is misbehaving.

    Mar 18, 2009 | 2003 Hyundai Accent

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