HEUI Injector Cleaning?
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Senior User
Joined: Mar 2006
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From: CT
HEUI Injector Cleaning?
I noticed one of my injector nozzles was so built up with some kind of hard black crust, and it wasnt even firing. I didnt pull the rest of them to inspect but im sure they cant be looking to good. I used a soft stainless steel wire brush, and some WD-40 to clean it up making sure not to let the tips of the wire contact the holes in the nozzle. It fixed my rough running, and knocking. Has anyone else cleaned there injectors, and how did you do it?
Laughing Gas
Joined: Feb 2007
Posts: 775
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From: Williamston, MI
I've read a few threads on Hot Shots Secret addative. I figured I'd give it a try too.
http://65.247.66.223/closeup.asp?cid=9&pid=102&offset=0
http://65.247.66.223/closeup.asp?cid=9&pid=102&offset=0
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Senior User
Joined: Mar 2006
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From: CT
Yea I used that and had good results, but thats an oil addittive. Im looking at cleaning up the fuel part of the injector. I use Diesel Kleen evey time I fill up, but I dont think its doing much if any cleaning.
Postmaster
Joined: Jul 2006
Posts: 4,993
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From: Bend, OR
Nothing wrong with that black coating, if you pulled that injector right now... it would be there again... you cleaning that injector tip had nothing to due with the injector firing again... it was unpluged from the harness or had a bad o ring...
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From: CT
The nozzle looked like it was dipped in tar, about a 1/16 of an inch thick. Not evenly spread but covering all the holes. Could anything else have caused it? I resently had the valve covers off for a compression test, so the harness wasnt the problem because the knocking and rough running was there before and after the compression test. I also didnt change the injector o-rings after I cleaned it, I just poped it back in.
Postmaster
Joined: Jul 2006
Posts: 4,993
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From: Bend, OR
YOU HAVE TO REPLACE THE O RINGS AND COPPER when pulling an injector, if its not leaking yet, it will soon. That coating is normal, pull another injector and it will have the same thing... Just soot.
The fact that it did it before and after means nothing, if the harness is bad its bad...
The fact that it did it before and after means nothing, if the harness is bad its bad...
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Joined: Mar 2006
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From: CT
This week ill be replacing all the o-rings and washers, when I pulled the first injector I knew id be taking it out again a few days later so I didnt bother doing it then. The truck passes the BUZZ test just fine, and now after cleaning the injector it passes the CC test. Before the compression test I got it to fail the CC test on the #4 cylinder. I did the compression test, changed the glow plugs, and did the CC test again which it fail the #4 cylinder. Only after cleaning the injector did it pass the CC test. Thats why I dont think its the UVC harness. I can run the truck with the valve covers off and move the harness around with it not making it miss, or knock. Maybe taking the injector out and putting it back in got the o-rings or washer to seat better fixing the problem temporarily.
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