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Old 11-14-2019, 06:03 PM #1
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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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Old 11-14-2019, 06:38 PM #2
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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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Old 11-14-2019, 06:41 PM #3
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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.

Misfire help!-spark-plug_wires-zcruiser-jpg


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Old 11-14-2019, 06:42 PM #4
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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..
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Old 11-14-2019, 06:50 PM #5
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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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Old 11-14-2019, 06:51 PM #6
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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..
But two breaking at the same time? What are the chances? Maybe the OP should buy some lottery tickets as well.
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Old 11-14-2019, 07:55 PM #7
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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.

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Old 11-14-2019, 08:11 PM #8
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Quote:
Originally Posted by mtbtim View Post
But two breaking at the same time? What are the chances? Maybe the OP should buy some lottery tickets as well.
I only lost 1 plug. It was misfiring and my cel was flashing. ;) I kept the plug as a conversation piece. I will post pictures of it on my build thread.

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Old 11-14-2019, 08:36 PM #9
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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.
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Old 11-14-2019, 10:10 PM #10
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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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Old 11-14-2019, 10:36 PM #11
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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.
Those are your upper and lower intake plenums. The intake manifold is much harder to see. Even if the gasket was bad, that wouldn't cause a misfire.
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Old 11-15-2019, 12:09 AM #12
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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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Old 11-15-2019, 12:53 AM #13
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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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Old 11-15-2019, 01:53 AM #14
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Quote:
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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.
If the intake manifold is leaking it can introduce unmetered air into the engine which can throw off the air fuel mixture and cause a lean condition causing a misfire. check for vacuum leaks and also clean the maf sensor.
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Old 11-15-2019, 09:28 AM #15
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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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