on my 2000 4wd tundra, suddenly got a p307 code, misfire in cylinder #7. Replaced all plugs (over 100k on originals and they looked brand new!!), got the same code, then swapped the ignitor on #7 to #2, ran till warm and got a multiple misfire on #1, #3 and #6. Makes no sense. Can all these ignitors be bad, or is it something else? 105,000 miles, and up until now (except for 2 02 sensors) has run perfectly. This started out of the blue.
2000 misfire - then multiple misfire
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971 Posts
It could be any number of things.
Bad gas,
Cam or crank sensor bad,
Plugged fuel filter, bad fuel pump, (check fuel pressure if possible).
Maybe injectors.
I once got cylinder misfire code after driving on a very low tank of gas, must has sucked some air in the pump.
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Sometimes residue from gasoline can accumulate at the bottom of a gas tank, and the pump only picks it up when the tank is really empty. That's the same reason why it's recomended to fill up at the same gas station because it lessons the chances of residue forming from slightly differnt gas.
Just a slightly usefull tip
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643 Posts
It is highly unlikely that several or all of your coil packs have simultaneously malfunctioned. Something else that effects all cylinders is the primary culprit. You just need to eliminate or confirm the possible causes.
My Haynes manual lists what low c1500 said plus checking of the vacuum lines. Have you checked all of your vacuum lines to make sure they are sealing tight at the ends and connected to the right palces?
Has the fuel filter in your truck ever been changed? If not, I would start there and pull it to see what condition it's in and to replace it regardless. I just did this on my truck and it was very easy. If you pull it, I'd check to see if it's clogged by simply blowing through it (after of course shaking out as much of the gasoline as you can.) If there is ANY significant resistance, then that might be the cause. My old filter was very difficult to blow through while the new one had almost no resistance to it at all.
A little more info would also help in diagnosing your engine.
- Before your CEL came on, could you feel that your engine was misfiring? If so, how bad was the misfire?
- Does the misfire or CEL occur while idling or when driving?
- When was the last time that your MAF and throttle body were cleaned?
- Has anything else recently been done to your engine, whether or not you think it might be related to your current problem?
That's all I got for now.
Paul
Thanks for all the good ideas. Started with the easy stuff: Changed fuel filter, plenty of nice dark brown stuff. Also cleared the codes, and just let it idle, (roughly) showed a misfire in cyl. 6, so I swapped with #2, and it followed to that cylinder, so I replaced that coil, and so far, smooth running. New plugs and filter sure didn't hurt anything, past due for those.
Right now, no codes, so life is good. Under $100 fix, can't beat it. Thanks to all!!!:ts:
Right now, no codes, so life is good. Under $100 fix, can't beat it. Thanks to all!!!:ts:
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643 Posts
Glad to hear that you found the problem and thanks for providing the follow up. Sounds like your fuel filter really needed replacing.
How does your truck run now compared to how it did before the misfires started? Where did you buy the new coil pack from and how much did it cost?
Thanks,
Paul
Got the coil at Advance Auto, 69.99, theirs was 92.00, but they said they would match NAPA's price and could get in by the next morning. NAPA would take 2 days. Since I needed to get it running asap, I went this way. Probably could find it cheaper, but time was important.
Runs as good or better than before the misfires started.
Haven't replaced the timing belt, but if I keep it I will do so pretty soon. Just bought a '05 Tacoma, so I might be selling this one.
Runs as good or better than before the misfires started.
Haven't replaced the timing belt, but if I keep it I will do so pretty soon. Just bought a '05 Tacoma, so I might be selling this one.
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HOW many miles can be expected from timing belt changes?
IIRC the interval is 80k miles or 5 years. I only focused on the 80k miles and went 12 years before my first replacement in 2013. My second replacement this last summer was at 160 k and 8 years.
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The '07 Tundras that went to 1 million miles did not replace more than 3 or 4 times. Do the math... Different scenario though because they were driven very frequently in a short time but worth considering.
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