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About a year and a half ago my Tundra died on the way to work. It seemed bad enuf at the time to retire it. 335,000 miles on the original drive train. I started looking at it today just for fun. It still starts pretty easily. Barely idles.....will not rev. No MIL light. My Autel tester shows cylinders 1, 3, 5, & 7 miss-firing but not enuf to throw a MIL. These are all on the drivers side of the engine....the same head. There is no oil in the water or water in the oil. I haven't done a compression check yet....What could cause one side of the engine to miss-fire?
Thanks in advance.

Ray
 

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While your tinkering swap the coils from 1,3,5,7 with 2,4,6,8 and see what you come up with. I am assuming you have checked the spark plugs? If the miss shifted to the other side of the engine replace the coils. With that mileage I would replace all 8 and might include a new set of plugs. But don't just replace anything without trying this suggestion first. If the miss remains on 1,3,5,7 then the culprit is is before the coils, maybe the plug wires.
We all have a shelf of parts we bought out of impulse waiting for the vehicle to need them, maybe later... Keep us posted... Chap
 

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While your tinkering swap the coils from 1,3,5,7 with 2,4,6,8 and see what you come up with. I am assuming you have checked the spark plugs? If the miss shifted to the other side of the engine replace the coils. With that mileage I would replace all 8 and might include a new set of plugs. But don't just replace anything without trying this suggestion first. If the miss remains on 1,3,5,7 then the culprit is is before the coils, maybe the plug wires.
We all have a shelf of parts we bought out of impulse waiting for the vehicle to need them, maybe later... Keep us posted... Chap
Thanks, that's a good idea. Hopefully next weekend I can do that and a compression check.
 

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It’s all 4 on the same side so i would be looking for a common ground to either the injectors on that side or the coil packs on that side. I can’t imagine it would be a fuel rail issue so I would look for a bad or cut ground wire on that side somewhere. Test for spark. If you’re getting spark, it should be a fuel issue. No spark, it is probably a wiring issue for the coil packs.

Has it has it’s timing belt replaced? It’s possible it could’ve jumped time on the drivers side cam. That’ll cause that entire side to misfire.


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Same problem, 2000 Tundra 265K New England truck ran like crap and would die. Then it would run fine for about 60 secs and do it all over again. 1,3,5,7 misfires, bank 1 lean code. Lots of flashing lights on dash. After tearing hair out trying to diagnose - as mentioned it would run fine for a minute then crap out- Randomly saw something about testing for fuel pressure on here. Popped fuel line off at intake and immediately noticed water sprayed out. Bypassed fuel pump relay (tricky) ran tank dry into a 5 gal pail. Over 1 gallon of water in fuel. Turned out sending unit( you’ll love the location- look down between gap in bed and cab) was rusted and gasket shot, every rain let water into tank. Dropped tank(remember NE truck-nightmare) and replaced gasket and sealed w RTV. New fuel pump for insurance. Truck has run like new ever since. See my post about towing a 6000# camper from NH to Fla- Just a thought
 

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While your tinkering swap the coils from 1,3,5,7 with 2,4,6,8 and see what you come up with. I am assuming you have checked the spark plugs? If the miss shifted to the other side of the engine replace the coils. With that mileage I would replace all 8 and might include a new set of plugs. But don't just replace anything without trying this suggestion first. If the miss remains on 1,3,5,7 then the culprit is is before the coils, maybe the plug wires.
We all have a shelf of parts we bought out of impulse waiting for the vehicle to need them, maybe later... Keep us posted... Chap
I have had this before it is or can be 1 or more coil packs.
Have a helper (wife or freind) sit in truck engine running g E Brake on and foot on gas. Put truck in gear advance idle to engine miss. Using a non conductive type tool or rag pull a coil wire if engine runs worse reinstall and move to the next, if you pull a coil and the engine is still missing as before. Mark that wire with tape and. Continue, if pulling all the rest of the coils one by one made the truck miss more the one coil pack is your problem.
The code is driven by the program and you see all the numbers were odd ones as the computer puts out that it is a odd numbered cylinder. I had you pull all even and odd as alot of people do not know there firing order.
Change that one coil and retest ,by start,Ebrake on put in gear raise idle if no miss you did good.
Inspect the coil for obvious problems. Burnt spots, cracks,etc to see what you can do to stop the next problem. But it is most likely just its time to die worn out.
 

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While your tinkering swap the coils from 1,3,5,7 with 2,4,6,8 and see what you come up with. I am assuming you have checked the spark plugs? If the miss shifted to the other side of the engine replace the coils. With that mileage I would replace all 8 and might include a new set of plugs. But don't just replace anything without trying this suggestion first. If the miss remains on 1,3,5,7 then the culprit is is before the coils, maybe the plug wires.
We all have a shelf of parts we bought out of impulse waiting for the vehicle to need them, maybe later... Keep us posted... Chap

Very stable advice Chappie!
 
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