Misfire 1-3-5-7

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Colorado80

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Hi All,

I need some expertise on this one. I am at my wits end. I have a 2000 Land Cruiser with 200k miles and I have taken care of it to the best of my abilities. Currently there is a misfire issue with the vehicle. The codes that is throwing are 300, 301, 303, 305, 307, 1300 and VSC Off

After reading the FAQ, I figured out that I needed to do check the coilpacks and plugs. So I went to the local dealership and got plugs and coilpacks. Now, when I start it, it still feels like a miss but now the CEL is flashing and not throwing up a code.

When the miss first started occuring I drove approximately 70 miles on it to get home. It would smooth out over 2500 rpm. All the plugs are new and there are four new coils on the driver side bank as it was showing up Cyl 1,3,5,7.

I am going crazy over this one. I am thinking maybe it ran the cats too hot with unburnt fuel and I might need a new cat. Please help me figure this out.
 
Have no idea why your entire bank is throwing codes. Have you cleared the codes by pulling your batt cable? This is more of a bump than anything.
 
I don't think the cats will matter at all. All the fueling should be controlled by the o2 sensors before the cats. The second sensor is just to keep an eye on emmisions, not performance.

I would also be sure you have re-set the codes and then go after wiring, connetors,etc.

In some cases folks have had good luck with replacing ecu fuses that (test ok, not blown) due to some minor corrosion issues causing voltage drop.

Just talking out my other end here but; maybe it's a fueling problem on that bank that's causing the misfire or head gasket (compression issue)? Misfire is not necessarily just an ignition issue.
 
Thank you so much for the responses. There is no such thing as a bad idea when you are trying to do things like this. So please keep them coming, sometimes things are very obvious which one may overlook.

@ Muddy Bean: I cleared them with my bluetooth piece and after your suggestion had a friend bring over a snap on unit and cleared; still no dice.

@ Oregon LC: Checked all the ground. Added another 4 gauge ground to the block upon your recommendation

@ AimCOtaco: Reset the codes; replaced the fuses and tried to go after wiring. Good news, I think I found the issue: rat/mice droppings behind the dash. The problem on the other hand is a whole another story. Still misfire on 1-3-5-7. I pulled the ecu out, took out the wiring out of the firewall and I can't see anything frayed or cut.

Thank you for your suggestions. They are very much appreciated from all. Please let me know if you have any other ideas of where I could be looking for wiring related issues that would cause this.
 
You don't suppose the timing belt jumped a tooth do you? Just trying to think what is common to a single bank.
 
I don't think it jumped a tooth as it was done right on time (90k) at the dealership and it is due for one now. But I do have some great news. As I was utterly frustrated, I setup an appointment with powderpig to take a look at the vehicle because I was about to break out a sledge hammer.

I will keep everyone updated.
 
Definitely interested in the outcome. Never heard of an entire bank out before
 
Colorado80 said:
I don't think it jumped a tooth as it was done right on time (90k) at the dealership and it is due for one now. But I do have some great news. As I was utterly frustrated, I setup an appointment with powderpig to take a look at the vehicle because I was about to break out a sledge hammer.

I will keep everyone updated.
Click to expand...

Any update? I have the exact same problem, but on the other side of the bank, 2-4-6-8 all putting out codes along with flashing chk engine light and VSC off. Toyota dealer tech is saying no way it's 1 bad coil causing it. They want to run a test to see if there are any bent rods from a faulty timing/tensioner belt (both changed 30k ago along with water pump). They are into it 3 hours after the test tomorrow and I'm really looking for any advice!!

I don't know much about this stuff...just weird, the shaking/vibrating came out of nowhere and 5 mins later the lights started blinking...over 2500rpm it runs super smooth.
 
We had this happen on our GX470. You have a wiring problem somewhere. Mice got to the wiring for the secondary air injection and it did the exact same thing you're describing. You don't have secondary air injection, so it's got to be some other wiring.
 
I have a problem very much like thia would like to know what you did to fix it
 
@OZARK From my recent research, it most likely is the timing belt skipping a tooth. Which cylinder bank is out? (1,3,5,7 (Drivers side) or 2,4,6,8 (passenger side))?

I was able to easily pull the timing belt cover off, turn the crank to match the crank pulley match 0° and check that the cam timing gears matched their respective timing marks.

The belt tensioner after some time may not produce the required force on the belt which may cause the belt to skip a tooth.
 
bajaphile said:
@OZARK From my recent research, it most likely is the timing belt skipping a tooth. Which cylinder bank is out? (1,3,5,7 (Drivers side) or 2,4,6,8 (passenger side))?

I was able to easily pull the timing belt cover off, turn the crank to match the crank pulley match 0° and check that the cam timing gears matched their respective timing marks.

The belt tensioner after some time may not produce the required force on the belt which may cause the belt to skip a tooth.[

It is the 2-4-6-8 bank misfiring. I pulled the plugs all were wet with fuel on that side, replaced with new plugs no change. Coils have power and ground to them .not sure on how to test the control wires so I did not. This problem happened over-night, with pack rat evidence on intake and inside air filter box fender side. I have been all over looking and feeling for a wire that could be cut and can't find a thing chewed. pulled the glovebox and boot from fire wall all looks intact. I don't see how it could jump time, but I had considered it and will check there next. thanks for the input.
Click to expand...
 
It is the 2-4-6-8 bank misfiring. I pulled the plugs all were wet with fuel on that side, replaced with new plugs no change. Coils have power and ground to them .not sure on how to test the control wires so I did not. This problem happened over-night, with pack rat evidence on intake and inside air filter box fender side. I have been all over looking and feeling for a wire that could be cut and can't find a thing chewed. pulled the glovebox and boot from fire wall all looks intact. I don't see how it could jump time, but I had considered it and will check there next. thanks for the input.
 
Mr Julian is right, mouse in intake + 3 or more cylinder misfire counts, basically fsm order with 3 or more cylinders reporting. Deal with all codes other than 0300 , 0301-0308 first.
1 check pcv hoses
2 check air induction for vac leaks
3 check valve timing
4 check fuel pressure
5 check coolant temp sensor
6 check MAF

being mouse evidence I would first spend time on ALL rubber vac and pressure hoses, pcv valve and maf wiring, grounds on same side.
Then cam crank and coolant sensor wires because it's easy. Then go for timing belt cover look see, which is the most plausible, except for the mouse which is why I'd think rubber or electrical. (and the entire bank at once)

one other random thought, you wouldn't think fuses that look ok that are ten or more years old could affect things, but they do. Rub all the prongs clean on something, it will help.
 
No, I think you just need to turn your crank to match the mark to 0°, then remove the bolts that hold the passenger side plastic timing cover, pull it back enough to peek in and verify that the timing mark on the cam gear matches the timing mark. I would do this first before doing anything else.

When you pull back the cover, you can see a "T" (hard to see in this image) and to the left of it is a distinct line (where my arrow is pointing to). There's a line on the star gear (marked) as well as a dot (marked). Make sure that its lined up perfectly after you turn your crank to match the matchmark on the crank pulley to the 0° on the timing cover.

timing marks.webp
 
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