Dimitar
Member
Hello there, I've been around these forums for a while, just haven't had time to sit down and do a formal registration. I have read endless threads about oil burning, but I think I have a different situation.
I bought my 99 accord 4 cyl 5mt with 270,000km (165k miles) almost a year ago. I believe the oil burning issues has been persistent since day 1 of buying the car, but I'm not 100% sure. It now has 305,000km (190k miles)
So this is the situation, when I'm driving 4k+ rpm, I get a lot of smoke from my exhaust (not all the time tho, lets say 90% of the time) It is oil burning for sure, as my coolant level is renaming the same, and its not running rich. While I understand that an engine with now 310k km is no doubt going to burn oil, the rate of oil consumed at 4k+ rpm is ridiculous. I'm talking half a quart (500ml) per 100km (60 miles). - I guess a sign that the engine is toast...
However, on my road trips (1300km, 800 miles) with the rpm and speed ranging 2,000-3500rpm (100-140kph) or 60-85mph for the American folks, the car consumed a mere 100-150ml. Fuel economy is excellent for 2.3 4 cylinder 5mt ranging from 30-38mpg depending weather conditions, A/C, etc.
I began with a compression test, all cylinders show excellent compression across the board. This would be hand in hand with the fuel consumption being good, and no noticeable loss of power from the engine. I'm aware that the valves are usually bad when it is smoking while idle, or using engine break. I have not noticed smoke on idle or engine breaking. Many people have told me oil rings (or a stuck ring) could be the problem. However, I have yet to see a car that burns almost no oil during normal operation, and excessive during high rpms.
I have run seafoam a number of times, I have removed the spark plugs (which showed no sign of oil or fuel fouling), sprayed combustion cleaner, while the car was off the ground, put it in gear and moved the front tires to move the engine. I left it over night, started it up in the morning with very little hesitation and slight smoke at start up.
Apart from trying to clean the insides or free stuck oil rings, I have tried oils of different viscosities. ( 0W-20, 5w-20, 5w-30, 10w30, 15w40, 20w50!!!)) I believe it burns around the same amount no matter the oil, except when I was putting thicker oil I was subconsciously driving regularly, without a lot of WOT which resulted in seeing less oil consumption. One observation I have made is, when I was on the highway with my friend driving behind me, I gunned it and saw a bit of black smoke (not harmful, indicates rich fuel mixture just that second) and he told me that there was no smoke following that little bit. I had it WOT for 3rd and 4th gear, so that has me confused.
I replaced the PCV valve as it was cheap and I was thinking it could be it. I removed the intake manifold, and I found it to be disgustingly oily. I'm talking about a quarter inch of built up sludge (about a cm). At the same time I removed the EGR and cleaned both thoroughly with fuel, and brake cleaner and let them dry. I did not notice the car running any different after performing this cleaning. I have been thinking of installing an oil catch can, to see if something is malfunctioning in the PCV system.
I have most likely done other things as well, or have further observations that are not coming to mind right now, but if anyone has ANY idea of what it could be, or a fix (no swap/junk) I would be very thankful
I bought my 99 accord 4 cyl 5mt with 270,000km (165k miles) almost a year ago. I believe the oil burning issues has been persistent since day 1 of buying the car, but I'm not 100% sure. It now has 305,000km (190k miles)
So this is the situation, when I'm driving 4k+ rpm, I get a lot of smoke from my exhaust (not all the time tho, lets say 90% of the time) It is oil burning for sure, as my coolant level is renaming the same, and its not running rich. While I understand that an engine with now 310k km is no doubt going to burn oil, the rate of oil consumed at 4k+ rpm is ridiculous. I'm talking half a quart (500ml) per 100km (60 miles). - I guess a sign that the engine is toast...
However, on my road trips (1300km, 800 miles) with the rpm and speed ranging 2,000-3500rpm (100-140kph) or 60-85mph for the American folks, the car consumed a mere 100-150ml. Fuel economy is excellent for 2.3 4 cylinder 5mt ranging from 30-38mpg depending weather conditions, A/C, etc.
I began with a compression test, all cylinders show excellent compression across the board. This would be hand in hand with the fuel consumption being good, and no noticeable loss of power from the engine. I'm aware that the valves are usually bad when it is smoking while idle, or using engine break. I have not noticed smoke on idle or engine breaking. Many people have told me oil rings (or a stuck ring) could be the problem. However, I have yet to see a car that burns almost no oil during normal operation, and excessive during high rpms.
I have run seafoam a number of times, I have removed the spark plugs (which showed no sign of oil or fuel fouling), sprayed combustion cleaner, while the car was off the ground, put it in gear and moved the front tires to move the engine. I left it over night, started it up in the morning with very little hesitation and slight smoke at start up.
Apart from trying to clean the insides or free stuck oil rings, I have tried oils of different viscosities. ( 0W-20, 5w-20, 5w-30, 10w30, 15w40, 20w50!!!)) I believe it burns around the same amount no matter the oil, except when I was putting thicker oil I was subconsciously driving regularly, without a lot of WOT which resulted in seeing less oil consumption. One observation I have made is, when I was on the highway with my friend driving behind me, I gunned it and saw a bit of black smoke (not harmful, indicates rich fuel mixture just that second) and he told me that there was no smoke following that little bit. I had it WOT for 3rd and 4th gear, so that has me confused.
I replaced the PCV valve as it was cheap and I was thinking it could be it. I removed the intake manifold, and I found it to be disgustingly oily. I'm talking about a quarter inch of built up sludge (about a cm). At the same time I removed the EGR and cleaned both thoroughly with fuel, and brake cleaner and let them dry. I did not notice the car running any different after performing this cleaning. I have been thinking of installing an oil catch can, to see if something is malfunctioning in the PCV system.
I have most likely done other things as well, or have further observations that are not coming to mind right now, but if anyone has ANY idea of what it could be, or a fix (no swap/junk) I would be very thankful
Last edited: