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  #1  
Old 03-09-2007, 09:34 AM
juanesoto's Avatar
Diesel freak!
 
Join Date: Mar 2006
Location: San Jose, Costa Rica
Posts: 300
ATF smooth, Diesel rough!

Hello guys!

I would like to hear your opinion about this. Two days ago I changed my engine oil and while doing that, I decided to try to clean my injectors using ATF. I readed this was possible due to the detergents the ATF has.

I made a little fuel tank from a gallon and poured 2 quarters of ATF and completed the gallon with Jet-1 fuel. I had the engine burn half of the gallon and the idle got really really smooth and quiet. I poured the remaining half gallon in my fuel tank (which was a 1/3 full) and the car was running like it never did before!

Yesterday I filled my tank with normal diesel and now the anoying nailing noise from the injectors is back!!!

Why could this have happened?

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  #2  
Old 03-09-2007, 09:43 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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Did you have the injectors tested for pop pressure and spray pattern?
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  #3  
Old 03-09-2007, 09:54 AM
juanesoto's Avatar
Diesel freak!
 
Join Date: Mar 2006
Location: San Jose, Costa Rica
Posts: 300
nope, my experiment was that, a simple experiment....

You know, I was there, waiting for the engine oil to drain.... I saw an empty gallon container, the atf quarts... I recalled having a couple of Jet-A1 fuel somewhere in the warehouse....

With the mix I did, the engine was running incredibly smooth! I was very very impressed with the smoothness and the quietness of the idle.
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1982 W123 300D NA Euro, 300K Miles, 4-speed manual, 3.46 rear diff, early W126 front brakes, Penta rims with 205/60R15 FH900's, custom fitted (by me) audio system, more to come into the money pit... Soon to be installed: Bilstein HD, R107 front discs and 4-piston calipers, HD Suspension springs, wagon front swaybar.

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  #4  
Old 03-09-2007, 10:03 AM
mrhills0146
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A Diesel will run very quietly and smoothly on ATF, that should not be a surprise.
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  #5  
Old 03-09-2007, 11:44 AM
H-townbenzoboy's Avatar
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Using ATF frequently has been known to coke injectors.
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  #6  
Old 03-09-2007, 06:06 PM
ConnClark's Avatar
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Using ATF has done nothing but clean mine out. Of course I only add mine when I change the fuel filter. I top off the fuel filter with ATF before I screw it on then purge the system of air like you should when changing the fuel filter. The other method is to just add a quart to the fuel tank and drive it.

Maybe you got air in the system?
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  #7  
Old 03-09-2007, 06:31 PM
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Join Date: Jul 2004
Posts: 7,381
The 616 and 617 will run very quiet on ATF, veg oil, motor oil and just about any other thicker oil you would add to the fuel. Why? I dont know. The engine sounds much better- but that certainly does not mean it is better for the engine. Even 1/2 gallon of any of these "fuels" will quiet the engine when added to a full tank. The louder engine will return when the oil is no longer burned. Same event occurs when cleaning the injectors with diesel purge.

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