I've never owned a diesel powered car, but was wondering if they also get intake valve gummy deposits like direct injection gas engines.
Do diesel engines also get intake valve crud?
- Thread starter berniedd
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If they use EGR, absolutely they used to. Some of the newer vehicles use post-DPF exhaust for EGR, thus eliminating the main source of crud in the intake tract - soot. TDIs used to required occasional intake manifold cleanings (usually done at the same time as the timing belt) as they would get pretty gunked up. Especially if the owner drove like a grandma.
This looks disgusting: http://forums.tdiclub.com/showthread.php?t=214903
(The people there seem to think waste vegetable oil is part of the cause, but I remember a friend's 1979 VW diesel used to lose power over time.)
(The people there seem to think waste vegetable oil is part of the cause, but I remember a friend's 1979 VW diesel used to lose power over time.)
Originally Posted By: spackard
This looks disgusting: http://forums.tdiclub.com/showthread.php?t=214903
(The people there seem to think waste vegetable oil is part of the cause...)
WVO was the direct cause of those valve deposits. TDIs run on actual fuel (#2 diesel, biodiesel) almost never get valve deposits, it all gets gunked up in the intake manifold. Driving like a little old lady or a hypermiling hippie really contributed to the issue as well. Yet another reason to take the car out and cane it once in a while - the good 'ol Italian tuneup.
The few people with documented WVO cars that don't have those deposits are few & far between - and those owners are fanatical about maintenance & how their WVO has been processed before pouring it into the car.
This looks disgusting: http://forums.tdiclub.com/showthread.php?t=214903
(The people there seem to think waste vegetable oil is part of the cause...)
WVO was the direct cause of those valve deposits. TDIs run on actual fuel (#2 diesel, biodiesel) almost never get valve deposits, it all gets gunked up in the intake manifold. Driving like a little old lady or a hypermiling hippie really contributed to the issue as well. Yet another reason to take the car out and cane it once in a while - the good 'ol Italian tuneup.
The few people with documented WVO cars that don't have those deposits are few & far between - and those owners are fanatical about maintenance & how their WVO has been processed before pouring it into the car.
The EGR's caused a lot on the Mercedes up until 1999, but they don't really lead to poor performance, just ugly dirty valves. Its not like on VW's where I have seen ports almost totally restricted, Mercedes diesels just seem to get dirty to a point and that's it.
Luckily it isn't that hard to disable the EGR.
Not sure how the CDI's are doing, but I haven't heard anything so I think MB solved the problem.
Luckily it isn't that hard to disable the EGR.
Not sure how the CDI's are doing, but I haven't heard anything so I think MB solved the problem.
Many diesels are turbos, and the blower overcomes some deposits.
But deposits are very real.
An old timers trick was to heat the carbon in the runners red hot with a torch, and then turn off the acetylene and use straight O2 to burn the deposits out!
But deposits are very real.
An old timers trick was to heat the carbon in the runners red hot with a torch, and then turn off the acetylene and use straight O2 to burn the deposits out!
In diesel's case it was directly a result of poor fuel. I doubt you will see anything now with ULSD being available country wide.
EGR devices were just the purpose for it getting in there, poor fuel was the direct cause.
EGR devices were just the purpose for it getting in there, poor fuel was the direct cause.
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All diesel fuel sold in this country is garbage compared too what they have in Europe.
The few times I found some BP with a Cetane of I think 55 ie more in line with what they have in Europe, man my Mercedes ran good. It was like candy!
ULSD has no affect on Mercedes motors one way or the other, the IP's are oil lubed. What does affect them is the low cetane level and poor quality.
I can't speak for other brands.
The few times I found some BP with a Cetane of I think 55 ie more in line with what they have in Europe, man my Mercedes ran good. It was like candy!
ULSD has no affect on Mercedes motors one way or the other, the IP's are oil lubed. What does affect them is the low cetane level and poor quality.
I can't speak for other brands.
Ya cetane leaves a lot to be desired but hey I guess we should just be thankful with ULSD for now haha.
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