When I replaced my spark plugs 3 days ago I looked through the hole and saw what looked like pretty severe carbon buildup on top of the pistons.
They literally looked like the bottom of a very old baking tray, very black and course looking!
I think this could be a combination of a few things including using the cheapest 91 RON fuel, I've only just changed the original clogged/sludged up fuel filter last week, the spark plugs I took out were gapped 40% too close, oil may be leaking into the chambers through the spark plug housing seals (noticed dark oil on thread of old plugs) and also the car has been doing a lot of highway miles this year sitting at around 1,550rpm most of the time.
Maybe it's from a combination of the above and whatever happened during the 115,000kms before I bought it.
May I add the car still runs great and smooth but I still want it cleaned. I have recently been hearing a sharp metallic sounding rattle on acceleration (not lifters, they are making a different rattle!) which I suspected to be pinging and now I've seen the top of the pistons it's not looking good
I bought a 2 pack of Valvoline injector and valve cleaner because they were only $9 for the pair. It said on the box to put 1 bottle per (up to) 70 litre/quart tank, but I've been tripling that dose, putting a full bottle into about 1/3 of a tank. Is this a bad thing to do?
Does throttle body cleaner remove carbon from the top of the pistons as well? And would I benefit from running a tank of 98 RON (Shell V-Power) through?
Thanks!
They literally looked like the bottom of a very old baking tray, very black and course looking!
I think this could be a combination of a few things including using the cheapest 91 RON fuel, I've only just changed the original clogged/sludged up fuel filter last week, the spark plugs I took out were gapped 40% too close, oil may be leaking into the chambers through the spark plug housing seals (noticed dark oil on thread of old plugs) and also the car has been doing a lot of highway miles this year sitting at around 1,550rpm most of the time.
Maybe it's from a combination of the above and whatever happened during the 115,000kms before I bought it.
May I add the car still runs great and smooth but I still want it cleaned. I have recently been hearing a sharp metallic sounding rattle on acceleration (not lifters, they are making a different rattle!) which I suspected to be pinging and now I've seen the top of the pistons it's not looking good
I bought a 2 pack of Valvoline injector and valve cleaner because they were only $9 for the pair. It said on the box to put 1 bottle per (up to) 70 litre/quart tank, but I've been tripling that dose, putting a full bottle into about 1/3 of a tank. Is this a bad thing to do?
Does throttle body cleaner remove carbon from the top of the pistons as well? And would I benefit from running a tank of 98 RON (Shell V-Power) through?
Thanks!