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 w…

That sounds reasonable, I have found broken valve springs in Toyota engines from that year. Lexus recall 138,000 vehicles to replace valve springs in certain 2006-2008 vehicles. This is something that requires diagnosing, a person shouldn’t just dive in under the suspicion of a broken valve spring. …

How was that broken spring diagnosed to be the problem? Someone very familiar with using a vacuum meter might have found that somewhat quickly but otherwise it seems it would have been a real needle in a hay stack mystery.

Where is irlandes when you need him? He would have had this properly diagnosed several years ago…

OP responds with the solution after a 4 year delay? Seems in this case anyway it was indeed very worthwhile to the community to invoke an older post. Old or new thread, if somebody has something informational to say on the issue, why not say it?

Rod_Knox: How was that broken spring diagnosed to be the problem? Someone very familiar with using a vacuum meter might have found that somewhat quickly but otherwise it seems it would have been a real needle in a hay stack mystery. A compression test would show-up that problem, right?

Im having the problem now in 2016 and any info on a misfire on a Tundra is had to find. Im now having the cold only misfire on my 2011 Tundra 5.7. It happens randomly as in some mornings it wont do it and some it will. It will also happen if the truck is left for more than 8 hours…maybe. It will be …

My Tundra was behaving just like you described. I had a local shop do the work. They were able to pressurize the cylinder to keep the valve from dropping down and did not have to remove the head. Taking off and putting back the overhead cam was a bit tricky. It was a fair amount of work.

[image] chupik3: I will do a compression test this weekend. Were you able to change the spring without removing the head or camshaft? As poster @recmxz mentions above, you probably have to remove the camshaft in order to replace a valve spring. Its an on overhead cam design, right? Befor…

So I desided to pull the passenger side valve cover instead of doing a compression/leakdown test. Sure enough the back intake valve spring is broken on the #2 cylinder. I called the local Toyota Dealer for a price to fix it and they quoted $3600-$4200 ! They say they must remove the head to do the r…

What is causing an intermittent misfire only when engine is started & cold?

Maintenance/Repairs

recmxz August 24, 2016, 3:58am 20

Compression test showed cylinder 2 was a little low, removal of the valve cover allowed us to verify the Crack in the spring. Had to look real close to see the crack. Was able to just replace the spring to fix the issue.

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What is causing an intermittent misfire only when engine is started & cold?

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