Best injector cleaner additive for diesel engines? - Mercedes-Benz Forum
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#1 (permalink) Old 06-22-2009, 03:54 PM
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Best injector cleaner additive for diesel engines?

What is generally the best fuel additive to clean injectors?

I used a Redline product, which didn't seem to be good.

I also used putting automatic transmission fluid (dextron/metron 5) into the fuel filter to clean the injectors this way. Is this a good thing to do, or does it endanger the engine if you do it too often (I already did it twice).

Until I get an appointment for injection pump timing/ALA adjustment I'd like to make my injectors as clean as they can get. I have improved the black smoke issue, but I'd like to improve it more, and then get the timing adjustments.

Thanks!
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#2 (permalink) Old 06-22-2009, 04:18 PM
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Don't want to start any trouble here but you may want to check out Lubro Moly "Diesel Purge". I use it before I change my fuel filters at 30,00 mile intervals.

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#3 (permalink) Old 06-22-2009, 04:48 PM
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I'd like to make my injectors as clean as they can get.
An additive won't be able to do that. They only way to reach that goal is to have your injectors removed, then disassembled and cleaned, reassembled and pop tested.

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#4 (permalink) Old 06-22-2009, 05:54 PM
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Yeah, I highly recommend the diesel purge - you don't have to use anything special, just something good. I did this procedure on my old '82 with two cans of SeaFoam, and the results were significant. Simply put, you take the intake line to the injector and put it in the can, and you take the exit from the filter and put it in an empty container - then run the car for 10-15 mins on 100% SeaFoam. It's worth it bigtime.

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#5 (permalink) Old 06-22-2009, 06:22 PM
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Thanks for your input.

I'll get Lubro Moly's "Diesel Purge".

I'll check out "SeaFoam" engine cleaner. There are a few clips on YouTube.

Burning automatic transmission fluid, nobody has commented to this so far. Any results?

Disassembly and cleaning and pop-testing would definitely be the best (but I'd probably put in new injector tips), but at this time I have to go the budget route.
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#6 (permalink) Old 06-22-2009, 06:40 PM
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I'll get Lubro Moly's "Diesel Purge"
Don't. Its nothing more than lantern oil and actually does nothing beneficial.

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Burning automatic transmission fluid, nobody has commented to this so far. Any results?
Even worse. Its harmful, not beneficial. ATF is not a fuel and shouldn't be anywhere near your injection system.

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Disassembly and cleaning and pop-testing would definitely be the best (but I'd probably put in new injector tips), but at this time I have to go the budget route.
So, spend $40 on useless snake oil or $75 to actually get them clean.

If you use quality fuel from a good source (a high traffic truck stop) then those snake oil cans wouldn't even be considered. If you use cr@p fuel from the cheapest gas station you come across then you'll be spending money to get your injectors cleaned every few years.

If your injectors are over 100k miles old they need to be removed and tested anyways.
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#7 (permalink) Old 06-22-2009, 06:50 PM
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Don't. Its nothing more than lantern oil and actually does nothing beneficial.


Even worse. Its harmful, not beneficial. ATF is not a fuel and shouldn't be anywhere near your injection system.


So, spend $40 on useless snake oil or $75 to actually get them clean.

If you use quality fuel from a good source (a high traffic truck stop) then those snake oil cans wouldn't even be considered. If you use cr@p fuel from the cheapest gas station you come across then you'll be spending money to get your injectors cleaned every few years.

If your injectors are over 100k miles old they need to be removed and tested anyways.
Thanks for this.

I didn't know that cleaning the injectors was only 75$ (hopefully not per injector).

The injectors worked well and weren't noisy or nailing until I had a vacuum pump breakdown. The resulting smoke must have really clogged them. I wanted to readjust injector pump timing anyway, so I can do both in one.

And no more transmission fluid into the fuel filter.

PS: you didn't mention SeaFoam. I found quite a lot on the web and people seem to like it.
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#8 (permalink) Old 06-22-2009, 07:29 PM
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I didn't know that cleaning the injectors was only 75$ (hopefully not per injector).
Most places charge about $15/injector to clean and test.

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The injectors worked well and weren't noisy or nailing until I had a vacuum pump breakdown. The resulting smoke must have really clogged them.
The vacuum pump can't cause smoke.

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And no more transmission fluid into the fuel filter.
Right, clean fuel only.
Don't pour the fuel from the old filter into the new one. I've seen some people do that and it makes changing the filter pointless.

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PS: you didn't mention SeaFoam. I found quite a lot on the web and people seem to like it.
Is snake oil like every other "cleaner" and "performance booster" on car part store shelves.
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#9 (permalink) Old 06-22-2009, 08:48 PM
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It was the breaking down of the vacuum pump that caused wild smoke.

No idea what was exactly happening. Even with the broken vacuum pump and the smoke the engine sounded OK (minus the rattle of the broken vacuum pump, which still produced vacuum).

When I got the car back from the mechanic, it was nailing hard, had no power, smoked like a wild west iron horse. It has improved, but power is still bad.

No idea what caused the injectors to clog up that quickly. I'll go for a cleaning first, and if this doesn't help, for a timing adjustment of the injector pump. (The mechanic took the timing chain off. No idea what he could have messed up).

Your advice, Zedd, is very much appreciated. Especially with the mechanical cleaning of the injectors and the pop testing.
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#10 (permalink) Old 06-22-2009, 08:51 PM
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The vacuum pump can't cause smoking. It doesn't have any influence over the engine except to turn it off.
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