Question about 2000 Yamaha YZF-R6

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Struggles to start. misfires when running. idle surges. all coils ohmed out within specs. pickup coil is also good. tps good.

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  • Dick
    Dick May 11, 2010

    Be methodical in your troubleshooting. Start with the easiest items to verify. Are the battery connections tight? Is the battery on the verge of failure? Is it full of electrolyte? Are the spark plugs all good? Spart plug wires?



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  • 33 Answers

Could possibly be a pulse sensor which is found on the timing cover. If that is ok and the rest of the CDI ignition is ok, then more than likely you're looking at the carbs which would need to removed, drained and thoroughly cleaned!

Posted on May 27, 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, 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

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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

I have a 1985 4runner 22re, it is having an intermitant start up. it will start normal and run for a couple of days then it will not start again. i have changed out fuel pump, fuel filter, fuel regulator,...

Try this----there should be two or three coils in the distributor. Check these coils with your ohm meter. The car will run with one bad coil in a "limp mode". However, if a second coil goes bad, it will not run or start. These coils can be intermittantly bad so you have to check them when you have a no start condition. If you check when car is running well then you may not find the problem coil. What are the code numbers?

Jan 11, 2011 | 1985 Toyota 4Runner

1 Answer

1998 chevy venture has electricity arcing across the harmonic balancer

The coil pack on these engines runs hot, so it's important to make sure there is heat sink grease under the coil to transfer heat. If the coil module gets too hot, it will fail.
If an engine is hard to start or has a misfire at higher speeds, the problem may be a weak coil, a bad plug wire, or a fouled or worn spark plug. On 1996 and newer vehicles, you should get a cylinder misfire code. A code for one cylinder would likely indicate a fouled plug, bad plug wire, or possibly a clogged or dead fuel injector, or a compression leak (burned exhaust valve). Misfire codes for two cylinders that share a coil would likely point to a bad coil.
Another way to figure out if a misfire is a bad coil is to swap two of the coils on the coil pack. If the misfire moves to the new cylinders, the problem is the coil. If the misfire remains in the same cylinders, the coil is OK and the problem is the wires, plugs, injectors or compression.
If you test a coil with an ohmmeter, the test specs are 0.5 to 0.9 ohms for the primary terminals under the coil, and secondary resistance of 5,000 to 8,000 ohms at the high-voltage terminal.

Dec 18, 2010 | 1993 Honda Accord

1 Answer

1997 S-10 4.3 6 cyl, 5 speed, VIN X, 250,000 miles, Misfires under load, Fuel Pump and pressure good, Plugs, Cap, Wires and Coil replaced, Timing Chain replaced, Gets random multiple misfire code 0300 and...

Check the ohm's reading on the fuel injectors, they should each read around 14-16 ohm's cold for most 1997 GM engines, and if any fuel injectors are not within range replace them.

May 09, 2010 | 1997 Chevrolet S-10 Pickup

1 Answer

1991 Dodge 318 no spark

Yes,an ohmeter across the two power leads(pimary) should yeild a fairly low resistance I'm not sure on the specs but it is just a winding so maybe 10 ohms,then test the secodary winding with one lead to either power lead and one lead to the high voltage post(the coil wire connection),should read about 10k ohms,you can go to and register and they have a repair guide that should have the test specs.

May 17, 2009 | 1991 Dodge D150

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