Toyota - Tundra :: Intermittent Misfire Only When Engine Is Started And Cold?
Jun 27, 2013
2008 Tundra 5.7 only 55K miles – What is causing an intermittent misfire at startup? It’s been running great, then 2 weeks ago when I started it up I could feel a misfire. By the time I backed out of the driveway the check engine light came on. This is what I have learned so far:
•It only happens when you start the engine and the engine is NOT at operating temperature.
•The engine code always reports misfire on Cylinder #2 I put in a new plug and swapped coils but it still reports the misfire on cylinder #2.
•Once it starts to misfire it will continue to misfire until the engine is at operating temperature and you restart the engine. NOTE: You MUST restart the engine for the misfire to go away. It will be running rough, turn engine off/on once it is at operating temperature and it's as smooth as can be, no more misfire.
•One time I started the truck, I felt the misfire and drove it to a parts store to read the code. Engine was fully warm by the time I reached the parts store. I did not power off the engine, plugged in the tester and read the code which was a misfire on cylinder 2. I cleared the code and within 2-3 seconds it logged the misfire on cylinder #2 again. Cleared the code several times and it kept reporting misfire on cylinder 2. You could also feel the misfire happening. Turned engine off, started it right back up, like before no misfire, cleared the code and it no longer reported a misfire.
•This just started intermittently happening. This morning it happened again, I drove it for about 5 min, engine was about 75% it’s normal operating temperature, powered it off/on, still had the misfire. Once engine temp reached normal temp (about 9 min), I turned off engine, started it back and like before problem was gone.
What is causing this to happen?
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When I bought my 2007 tundra used a year ago, it has always had a vibration that affected the whole car (not steering-wheel specific), and was worst at 60-65mph, but a hint was there even at lower speeds. It was annoying, but bearable, for example if you look at the passenger seat at these speeds, you can see it wiggle back and forth about 1/2". It seemed highway speeds were where it hit a resonant frequency.
In the past month, things have gotten much worse and when the truck has been sitting for a few days, if I quickly leave the house and hop on the freeway (only about 1/2 mile away, I get a vicious vibration mostly in the steering wheel and less so in the rest of the cab. The wheel wiggles about an inch and a half back and forth at highway speeds and letting off the gas, braking, accelerating doesn't make much of difference, just speeds up or slows down the vibration frequency.
The wild thing is that it gets much better after about 2-3 miles. No longer really shaking, just a mild vibration like it has always had. If the truck is warm and I hop back on the freeway a few hours later, no vibration, just when leaving the house in the morning.
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The vehicle: 2007 Tundra, 5.7, 4WD, SR5, 71K miles
The issue: The Check Engine, VSC and 4LO indicators came on abruptly within 5 minutes of the first start-up of the day and after driving ~ 1/2 mile on paved road. Weather conditions: high humidity and unseasonable high ambient temperature.
What has been done: Immediately returned home. My local "guy" stopped by with his code checker. Codes that came up: C10201 and P2440 (Wheel sensor and secondary air pump, I am unsure which is which). Codes were cleared, indicators went off. Within 0.2 mile of driving "around the block" the same indicators and codes came on. My local guy recommended a trip to the dealer for repair as he would have to get sensors/parts from Toyota and be replacing sensors until the problem was repaired (I respect him for that).
The question: what is the guesstimated cost for dealer repair? The truck can be operated in a "failure" mode and can get to the local dealer under it's own (reduced) power.
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