testing/cleaning the injectors - Mercedes-Benz Forum

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post #1 of 15 (permalink) Old 04-24-2008, 12:48 AM Thread Starter
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testing/cleaning the injectors

How do I know if my injectors are working properly or not? Can I do this?
Detach the injectors from the engine heads, but leave them attached to the fuel rail. Then unplug the wire connectors and apply a 12V electricity to the injectors. Will that trigger the injectors to spay? (so I can see if they are working)

The problem I have on my CLK430 is a slight misfire at idle. The car runs fine, good power and 20+ mpg. I have changed the plugs, the wires, cleaned the MAF and the throttle body. I'm thinking of removing the entire intake manifold and clean the inside and the injectors.

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post #2 of 15 (permalink) Old 04-24-2008, 02:14 AM
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Not sure what voltage goes to the injector. Applying straight 12V might burn it.
I would start with measuring each cylinder heads or exhaust with infra red thermometer.
Bad working cylinder is going to be colder.
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post #3 of 15 (permalink) Old 04-24-2008, 04:43 AM
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A diagnostic tool I purchased for my MerCruiser boat engine includes an injector connector. The tool sends a pulse train to the injector. The tool was used to flush the injector w/ WD-40 / spray start and compressed air.

That process helped big-time. A new set of injectors would have cost $1,600. There are companies on-line that will clean, test and return your injectors.

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post #4 of 15 (permalink) Old 04-24-2008, 07:46 AM
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Cleaning injectors should bring them back to 99% performance.
So often the dealers are becoming parts changers.
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post #5 of 15 (permalink) Old 04-24-2008, 11:00 AM
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I don't see anything wrong with cleaning the intake manifold and the injectors but there might be an easier way.

Have any stored codes read at your local parts store and post them here. There are a number of commercially available fuel additives that might solve your problem. but MB only approves of two; Chevron Techron Concentrate and MB part # A 000 989 25 45 12. I would try both of these and report back.

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post #6 of 15 (permalink) Old 04-25-2008, 12:55 AM Thread Starter
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thanks for all the suggestions. Kajtek1 has a good pt. I won't apply elec. to the injectors.

The reason I want to remove the entire intake manifold is I tried that on my Alfa v6 engine. When I opened it up, the inside was coated with black oil/dirt mud-like 'stuff'. After I cleaned it, the engine was so responsive. Plus it doesn't look it's too difficult to remove it in the MB v8.

The MB dealer wants $170 to run a BG clean. I figure I can clean them better and much cheaper. I can shoot some FI cleaner directly into the injectors. I'm thinking NOT to remove them from the fuel rail to avoid the messy fuel spill. (I already bought the injector o-rings and the intake gaskets.)

I have an error code P0173, bank 2 fuel trim... Also I hear a slight hissing sound when I tap the gas. So I think I have a vac leak. If I remove the intake, maybe I can find the leak too.

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post #7 of 15 (permalink) Old 04-25-2008, 10:40 AM
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Before you roll up your sleeves you can always try some "miracle cure".
Some members here swear by SeaFoam for engine cleaning. You can add it to the fuel to clean the injectors and you can pour it slowly into intake with engine running to clean the deposits there. The sludge in the intake manifold is probably the stuff coming from EGR. On diesels that stuff can even clog the intake completly.
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post #8 of 15 (permalink) Old 04-25-2008, 10:48 AM
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P0173

I did a quick search and according to Ohlord a plugged injector can trigger that code. He also said a weak 02 sensor, faulty catalytic converter or a dirty air filter can do it.

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post #9 of 15 (permalink) Old 04-25-2008, 10:56 AM
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Quote:
Originally Posted by RK430 View Post
The MB dealer wants $170 to run a BG clean.
For what this is worth, my dealer uses a BG product also. I bought a bottle before I discovered that MB solution I mentioned earlier and have never used it. It is called Supercharge II, part no. 202. The bottle says "cleans fuel injectors". Your dealer evidently has some power flushing apparatus (BG sells those too) that they plan to use. As you stated, you can do it for less than $170.

I only mention this because they evidently feel the BG products will not harm the other parts of our engines. My Chrysler dealer technician highly recommends the BG 44K which, by the way, is strong enough to remove your car's finish so you have to be careful using it. I have added 44K to the fuel in the Plymouth and Toyota and it didn't seem to hurt anything. Did it help? Good question, and maybe ny injectors were fine and didn't need cleaning. My Toyota dealer also adds 44K at the 30,000 mile services.

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Last edited by Musikmann; 04-25-2008 at 11:01 AM.
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post #10 of 15 (permalink) Old 04-25-2008, 12:15 PM
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I also cleaned my injectors myself on an ancient Camry.
I removed the rack and then did each injector by hand.
I picked up a generic injector cleaner that is supposed to be added to the fuel system and made a solution of gas and injector cleaner ( about 1 to 1) and dipped it in and watched it work.
I also used a small paint brush to help the dark varnish and crud come off.
I then dripped the solution through the injector for a little while and then flushed it all with gas. Added new "0" rings and re-installed.
They looked great and ran great.

Total cost $ 8.00 and the fun of completing a new DIY experiment.
Good luck on whatever you decide to do.
Derek

Last edited by DEVOURS; 04-25-2008 at 07:36 PM.
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