Misfire help!
Headed home after work and the 2000 4runner started idling rough. Took off at the stop light with very little power and the truck was shaking pretty bad. Check engine light started flashing so I pulled into AutoZone. P0300, p0302, p0304. Also a very rich smell from the exhaust. 2000 4runner, v6 4x4 with 202k
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@ASUMTNEER
cel flashing means unburnt fuel in the cat also the cause of fuel smell. Check spark plugs, coils, wires if they are all good move on to the injectors.
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This means you are having misfires in the #2, and #4 cylinders which are both on the driver side of the motor and sit next to each other. I'm wondering if your head cracked between the two cylinders and your losing compression as a result. I'd start by pulling all the sparks plugs and doing a compression test of al the cylinders. The video below will help you understand the process. It could be spark plug wires or bad coil packs but these misfires would involve more than one coil pack and the chance two coil packs decided to fail at the same time seems kind of rare to me. If it were actually bad coil packs, the coil pack on the #3 cylinder would be your only good one left. You could swap the position of the #3 coil pack with one of the others and see if the misfire changes and now gives you a cylinder #6 misfire.
Attachment 348359 <iframe width="560" height="315" src="https://www.youtube.com/embed/ky7bndfFpO0" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> |
What Spartacus stated is exactly what I would do.
Very possible bad plug coil wire. My one rig had the original spark plugs in it at 215K. It was misfiring because the electrode in the plug broke..:( |
Another thing I just thought of is the weather is starting to get colder and rodents will seek out warm areas to make a nest. Check your engine compartment carefully for any signs of rodents making a home. They have been known to chew up wires and wreak havoc with automobile electronics.
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Mine was very interesting. The po thought he was loosing a rod. As the piece of one electrode stuck in the piston. I saw it with an inspection camera. After I bought the rig with 215k on it. Engine now has 267k on it now. Still perrs like a kitten.
Best to change your plugs by the mfg time interval. So that dosent happen. Sent from my SM-J337V using Tapatalk |
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Sent from my SM-J337V using Tapatalk |
After letting it run, shut it off, and wait for about ten minutes, then see if you smell gas coming from under the hood. If not, then ohm out each injector. I would say possibly a coil in an injector failed.
As other have said though, start with the easy: wires, plugs, coils. |
Going to pull the plugs tomorrow and see what they look like. Any chance it's the intake manifold gasket leaking? I did notice the other day that there is a good bit of carbo built up around the area where the upper and lower part of the manifolds connect.
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Also, when it is misfiring, grab a long screwdriver and listen to both injectors for the misfiring cylinders.
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My suggestion is to do some diagnosing first before throwing money at it. You're having a double misfire on neighboring cylinders. There's been countless people who have started out their search for an answer by changing out perfectly good spark plug wires and coils just to find out the culprit was something else entirely. I've been guilty of throwing parts at problems myself.
Reset the CEL, swap the position of the one know good coil pack on cylinder #3 with either the coil pack on cylinder #1 or cylinder #5 and see if the misfires change. If nothing changes, it's not the coil packs. The wires will be harder to swap because they are different lengths. If you have a friend that also owns a 3rd Gen, maybe you could borrow a couple of his wires to eliminate the possibility of a double spark plug wire failure. Like I said earlier, I find this highly unlikely that 2 wires would fail at the same exact moment. |
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Don't have time to do anything with it today, but I did stop by AutoZone this morning, where the car still sits, to get my parking pass and decided to erase the codes and start the car. When I scanned for codes, there was nothing there. I started the car and it fired up fine and idled smoothly for the 15 seconds I let it run. I had to get to work, so I couldn't do anything else with it. I'm going to attempt to drive it home this evening and tear into it tomorrow. Thanks for all of the help so far.
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