Question about 2006 Subaru Outback

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I was wondering about the life of my plug wires,so I would like to check the Resistance with an ohm meter to see if they are still in spec. Does anyone know the ohm spec? Thanks Mike P.

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Don't know the actual resistance but the general resistance I use that has not let me down is 1000 ohms per foot and not more than 10,000 ohms on any wire.

Posted on May 12, 2009

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Computer says misfire 1&2. plugs & wires ok. Wires go to two double coils? Can they be tested? How? How much resistance will a good plug wire have?


Usually, about 1,000 ohms per inch is acceptable for spark plug wires. You also use an ohm meter to check coils. Primary resistance is typically low-about 1 or 2 ohms. Secondary resistance is typically high-about 7,000 - 12,000 ohms. It is specific for different coils, you would have to see the coil specs for your Toyota. Register for free at autozone.com, giving make, model, year, and engine size. The repair guides there may have the coil specs. It would also show how to test the coils.

Aug 05, 2013 | 1999 Toyota 4Runner

1 Answer

Have a 97 Mitsubishi eclipse gs. idles rough at a stop but runs smooth once I give it gas. Check engine light is on. had scanned and all it reads is cylinder 1 misfire. Any ideas?


Guessing you have a diagnostic trouble code of P0301. I would start by checking the spark plug first but the most common causes for a single misfire in your vehicle would be a bad fuel injector or bad spark plug wire. Now I am going by you have the basic Eclipes GS and not the GS-T with a turbo and that you have a 2.0 liter with dual overhead cams. You can check the injector with an ohm meter simply by unpluging it and checking the reisistance from one terminal to the other on the injector (see picture below). The resistance should be between 11 & 15 ohms. If it's not within specs, then it is bad and you need to replace it. In most cases the plug in that cylinder will be black as well when you check it but that's not always the case. If that tests out good I would visualy inspect the spark plug wire for that cylinder to see if it arching out soemwhere. There are so many aftermarket plug wires that there really isn't a full proof way of checking it. According the the specs for the wires as if it had OEM spec wires would be 3,000 to 12,000 ohms per foot of resistance when checking end to end with an ohm meter. These are the things I would start checking and if I was a betting man I would guess the injector was bad. Hope this helps


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Apr 08, 2013 | Cars & Trucks

2 Answers

How to Test for faults in wire Due to a ground or short. I have a nice multimeter And i dont know how to go about testing. Thanks!


Clean your battery terminals!!! To test a wire for a ground fault, you put either lead tip to a clean point on the block of the engine and the other to one end of the wire to be tested. The Meter setting should be on Ohms. The reading should be close to infinity if ok, and close to zero if shorted. The wire should be pulled from BOTH ends to check for opens and your meter should be connected with one lead at each end of the wire.

Jan 19, 2013 | Cars & Trucks

1 Answer

How to test a coil with a voltage meter


There are two places to check resistance. Set the voltmeter to ohms, and pull off all wires on the coil. Measure the resistance between the plus and the neg. terminals on the coil. Second, measure between the coil tower (where plug wire connects) and the negative terminal.
You have to know the specs for your coil, so you will know if your tests are within the specs. Consult a repair manual for your vehicle, or ask at the dealer service department, or maybe the parts person there will know (then again, it's an '87, they'd have to look it up somewhere...).

Your first reading should be low-on the order of 0.8-2 ohms, or maybe 3 ohms at most. The second reading is always pretty high, say 8,000-10,000 ohms, or 8 to 10 kilo ohms. You have to know the specifications for your coil-it would be in a repair manual. If the coil falls within the specs, it is good.

Dec 31, 2012 | 1987 Dodge Ram 50

1 Answer

Just need instructions on how to change the spark plugs and wires


Spark Plugs Spark plugs ignite the air and fuel mixture in the cylinder as the piston reaches the top of the compression stroke. The controlled explosion that results forces the piston down, turning the crankshaft and the rest of the drive train. The average life of a spark plug 30,000 miles (48,300 km). On the 2.2L (LN2),engine the life of the spark plug is 100,000 miles (166,000 km). Part of the reason for this extraordinarily long life is the exclusive use of unleaded fuel, which reduces the amount of deposits within the combustion chamber and on the spark plug electrodes themselves, compared with the deposits left by the leaded gasoline used in the past. An additional contribution to long life is made by the High Energy Ignition (HEI) system, which fires the spark plugs with over 35,000 volts of electricity. The high voltage serves to keep the electrodes clear, which suffer less pitting and wear compared to breaker point ignitions. Fig. 1: Breakdown of a common spark plug 86812008.gif
Fig. 2: Heat range on spark plugs explained 86812006.gif
Nevertheless, the life of a spark plug is dependent on a number of factors, including the mechanical condition of the engine, driving conditions, and the driver's habits. When you remove the plugs, check the condition of the electrodes, they are a good indicator of the internal state of the engine. Since the spark plug wires must be checked every 15,000 miles (24,000 km), the spark plugs can be removed and examined at the same time. This will allow you to keep an eye on the mechanical status of the engine. A small deposit of light tan or rust/red material on a spark plug that has been used for any period of time is to be considered normal. Any other color, or abnormal amounts of wear or deposits, indicates that there is something amiss in the engine. Fig. 3: Explanation of the spark plugs numbering system ---
Spark Plug Wires INSPECTION & TESTING Every 15,000 miles (24,000 km), inspect the spark plug wires for burns, cuts, or breaks in the insulation. Check the boots and the nipples on the distributor cap. Replace any damaged wiring. General Motors requests that you replace your spark plug wires every 30,000 miles (50,000 km). The resistance of the wires should be checked with an ohmmeter. Wires with excessive resistance will cause misfiring, and may make the engine difficult to start in damp weather. To check resistance, remove the distributor cap, leaving the wires in place. Connect one lead of an ohmmeter to an electrode within the cap; connect the other lead to the corresponding spark plug terminal (remove it from the spark plug for this test). The following chart gives resistance values as a function of length. Replace any wire which shows a resistance over 30,000 ohms.
  • 0–15 in. (0–38cm): 3,000–10,000 ohms
  • 15–25 in. (38–64cm): 4,000–15,000 ohms
  • 25–35 in. (64–89cm): 6,000–20,000 ohms
  • Over 35 in. (89cm): 25,000 ohms
It should be remembered that resistance is a function of length; the longer the wire, the greater the resistance. Thus, if the wires on your car are longer than the factory originals, resistance will be higher, quite possibly outside these limits. prev.gif next.gif

Aug 01, 2010 | 1993 Oldsmobile Cutlass Ciera

1 Answer

1995 nissan pickup throttle position sensor


ok on a 2.4l on the black/green and white wires use ohm meter and there is no specific spec for that engine just make sure the the resistance changes and there is no dead spots. for the 3.0l black and white wires specs are 1.0-9.0k ohms im guessing the specs are the same either engine. close to full open


Jul 13, 2010 | 1995 Nissan Pickup

1 Answer

Dodge neon 1996.it has no spark.already le intal crank position sensor and cam sensor.and yet has no spark.that may be.


remove electrical plug from coil,with test light check tosee if u are getting power to the coil with the key on.(remove fuel relay during the testing) if there is power to coil then check resistence on coil. with plug still disconnected.take ohm meter and connect to the two outside plugs to check ohm resistance 0.45 - 0.65 ohms then use ohm meter to check secondary resistance.connect ohmmeter across the two secondary terminals of each coil. resistance 11.5-13.5 k-ohms. if all checks out test wires and plugs. hope this will help!!!

Apr 20, 2010 | Dodge Neon Cars & Trucks

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

How do you check a dis coil (three coils on Ignition Control Unit) from 1997 Olds Cutlass Supreme 3.1L engine. Might you have the specs? I have a good ohm meter. Hand held OBD unit reports multiple random...


3.1L Engine
  1. Tag and disconnect the two plug wires attached to the suspected coil.
  2. Remove the two screws securing the ignition coil to the Ignition Control Module (ICM).
  3. Remove the ignition coil.
  4. Before testing, visually inspect the coil for carbon paths or cracks which will contribute to weak spark symptoms.
  5. Using an ohmmeter, check the resistance between the primary terminals on the underside of the coil. The resistance should be 0.50-0.90 ohms.
  6. Check the resistance between the secondary terminals. It should be 5,000-8,000 ohms.
  7. If the coil failed either test, it must be replaced.

Oct 07, 2009 | 1997 Oldsmobile Cutlass Supreme

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When should plugs, wires, rotor, etc be replace 2002 Nissan ext. cab Desert Runner


every 3-4 thousand miles like oil if you want maximum millage and life for your engine

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