You can remove a wire and gently bend it to see if the rubber sheathing cracks. The bend test: Even with , miles on them, the OEM plug wires take a curve without cracking. Quality OEM product right there. With the spark throwers and spark carriers cleared of responsibility for code P, we moved along to the spark makers. On this Toyota, three coil packs live on the 1, 3 and 5 cylinders, and each power a plug there and on the opposite side of the engine, at 2, 4 and 6.
The system is called waste-spark: The coil shoots two sparks at once, and the plug fires twice in the combustion cycle —once to fire the cylinder and once more to clean up the leftovers in the exhaust stroke. Find the problem, and solve it. Using a multimeter, you can test the ohm ratings of both primary and secondary outlets on the waste-spark coil, and all of those on this truck tested well between 0. Consult your repair manual or factory service manual FSM for all the test ratings.
With no indication of a bad coil, a return to the swap methodology sensible method had us switch the 1 and 3 coils, but the miss at 4 remained. One of three waste-spark coils on the Toyota V6.
With P continuing despite plug, wire and coil checks, we were done with easy fixes. On to the next suspect, indicated by the plugs lean read on 4 , misfire behaviors intermittent, heat-related and occurring at consistent rpm and the elimination of other suspects: fuel. Though an injector problem had been suggested earlier, it was best to rule out the ignition parts before moving on to a set of injectors that required some real wrenching to access. Have a few spare O-rings around.
Expect to replace gaskets most of the time. The fuel injector is nestled beneath the rail in this shot, with the rail holding it gently in the injector port. You must be equally as gentle. On this Toyota engine, the gray-top injectors often identified by color should test between 12 and 16 ohms. The Hole 4 shooter read 0. The bad fuel injector was just as dirty and slimy as the other injectors, so the multimeter was necessary to see it for what it was.
Speaking of dirty, a bottle of fuel injector cleaner could save you this job, should the injectors just be clogged and not mechanically toast. With plug-related misfires, worn or improperly installed spark plugs make up the majority. If the spark plugs are not properly torqued down, they can leak air and throw off the air-fuel ratio, and if not installed properly, plugs can cause an air gap issue.
For ignition coils, they will send a misfire code if they fail, but the code may not be the cause of the actual problem.
Another common engine misfire is called carbon tracking or flash-over. This occurs at the coil-on-plug ignition on the spark plug insulator, and it is often caused by oil, dirt, erosion, or moisture that grounds the spark. But with modern spark plugs, you can prevent flash-overs through a high-alumina, multi-rib ceramic insulator design.
Spark plugs may be one of the main causes of engine misfires, but with the use of iridium in the design of spark plug fine wire, it addresses misfires like never before. It provides fewer chances of misfires because of the metal that protects against high temperatures, oxidation, and corrosion.
We have done the research, including flame kernel measurements, heat range testing, micro material analysis, dielectric testing and many more evaluations, to enhance the performance, durability, and ignitability of plugs for domestic and import engines. This plug offers the highest level of performance and a limited lifetime warranty to show you we mean business.
Driving with a misfiring cylinder is potentially dangerous. If you lose power while you are driving, or a second or third cylinder goes out, this can cause you to get into a car accident , potentially injuring you and others around you. If you suspect a misfiring cylinder, make an appointment with a mobile technician from YourMechanic as soon as possible to have your vehicle inspected and repaired.
This article originally appeared on YourMechanic. Autoblog is partnering with YourMechanic to bring many of the repair and maintenance services you need right to you. Get service at your home or office 7 days a week with fair and transparent pricing.
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