MVS Forum member HWG09 asks how to tell if his ’99 V70 R has a burnt valve, and what follows is literally pages of discussion on how to diagnose and treat burnt valve conditions.
Just in case I got a new coil in case #2 was bad. I put the new plugs in last night along with the coil and nothing changed. Still shaking.
Today I tried the new coil in every cylinder with no luck. So I’ve still got a shaking engine and CEL.
With the MAF Sensor I cannot for the life of me get the old one off of the hose. It twists around no problem but will in no way separate enough to pull it off. I thought it best to clean the existing sensor before installing my new one but no way to get it off. Any ideas?
I don’t really want to take the car back in to the shop since I’ve pretty much done everything they were gonna do but I’m not sure what my next step is.
Here is a video of how the engine is shaking these days…
socompsp » There is debate on the topic, but usually bad air to fuel mix ratio (running rich or lean), and/or valves covered in oil from back guide seals. the oil causes the valve to cool and heat unevenly, then cause carbon buildup and not set/seal correctly causing hotspots and chipping. id do a comp test before you spend your money, cause you could be needing every cent you have.
How did i burn mine? i assume one of the above mentioned reasons but cannot be sure. all i do know is it bogged down suddenly under alot of load and my CEL started blinking indicating a dead miss. how much load? to paint a picture for ya, when it lost power and i looked at the gauges, i was at 135mph and dropping. but now i have a machined head, new gaskets all around, all new seals in and out of the head including cam and guide seals. all that, and my indy did an idler pulley and oil change for the $2000 i stated prior.
rspi » I have seen burnt valves in these white blocks with less than 65,000 miles on them.
If you need to, you can drive the car with the #2 fuel injector disconnected. Have not heard of anyone having problems with doing that. I would likely pull that coil plug as well but that probably doesn’t matter.
I usually check oil shortly after a change and monthly after that. Heck, the owners manual advises people to check oil at every fill up like they use to do at the full service gas stations years ago.
Check your receipt to see if it shows how much oil they added when they changed it in September.
