| Author |
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Bob Foster (Coppertop)
| | Posted on Tuesday, January 07, 2003 - 11:22 pm: | 
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Got a buddy of mine with a 2002 Disco. His Check engine light came on so he took it to the dealer.
THey had to do a MAJOR repair to the motor (cleaning the heads and pistons I think). It was under warranty still but my question is....what if it wasn't??? Has anyone else had a similar problem?? Also, he has been using 93 octane. Any other way to prevent this from happening?
Hoping for a squeky clean motor |
Geoff 93 RRC (Geoff)
| | Posted on Wednesday, January 08, 2003 - 12:42 am: |
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Well I had the motor inhale about 12 oz of water and it steamcleaned all of the carbon out, including the top of the exhaust downpipes (when I dropped it down a couple of weeks later!). Plugs looked almost new afterwards.
This is an old trick that used to be fairly common in the days of points ignition, carbs, and poor gas quality.
What I did was:
- warm engine to operating temp (hotter the better)
- disconnect the vacuum hose at the top of the intake plenum; put a spare vacuum hose on the fitting
-rev the motor to about 1200 rpm, or just enough to create a little vacuum
- put the other end of the vacuum hose into a container of water.
- let it inhale the water.
- drive car "like you stole it" to help flush out loosened carbon.
- repeat if necessary.
The difference in temperature of the water vapor to the hot carbon deposits and shatters them. Very effective.
Use at your own risk as water is not compressible and can hydrolock the engine if too much is used. Letting a small diameter vacuum hose suck it in metered it well for me. Also, I have read stories of stuck valves due to the carbon chunks getting caught. Again, I had no problems and the practice used to be fairly common. |
ron morgan
| | Posted on Wednesday, January 08, 2003 - 01:02 am: |
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About five years ago a took our boroscope from work home and looked through my engine, it was amazing at all the carbon built up everywhere. I performed the same water trick, (my dad calls it the $10.00 valve job) and it was clean as could be after, only noticeable where some dark stains from where carbon had soaked in. I like the metered trick better, I just kept spraying it in with the garden hose nozzle on low stream. Now I do it before every oil change. I have also heard about people using everything from brake fluid to Coke-a-Cola. Ron |
Boris
| | Posted on Wednesday, January 08, 2003 - 07:13 am: |
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Redex fuel system cleaner also does the trick. I watched a Mechanic do it many years ago. Redex actually advise to slowly pour 200 ml in to the carburetor whilst the engine is running. I did this by pooring it slowly down the plenum chamber vacuum line. Beware, do it at night as what comes out the exhaust pipe would have the fire trucks coming, I don't think the eviromental protection authorities would like it either,it smokes like hell for a few minutes. |
Joshua Smith (98hoo)
| | Posted on Wednesday, January 08, 2003 - 02:11 pm: |
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How much water do you let run through the engine when you attempt this? |
muskyman
| | Posted on Wednesday, January 08, 2003 - 03:11 pm: |
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with all the carbon build-up stories I hear on this site I'm surprised that nobody is running water injection?
i had a highschool shop teacher that used to run a vacume line into a coke bottle before every oil change done in the shop. by putting a piece of cheese cloth across the exhaust you could catch the carbon deposits as they where spit out the tail pipe!
this is old tech for sure maybe someone should e-mail it to LRNA...lol |
Doug (Sagger1)
| | Posted on Wednesday, January 08, 2003 - 04:07 pm: |
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I've herd of this method used before, but using a injector cleaner. Called "Wet Soak". The process was a little different also but the idea was the same. When you use the cleaner you use the vacuum to introduce the fluid a little at a time. Then after you have used about half of the cleaner you allow the engine to flood or stall by sucking in the cleaner until the engine dies. Then you let it soak for 20 minutes and then start it up.
Worked for the old BMW.
The only problem I ran into was my car would not quit. The thing would just barely run, just when I thought it would die it would kick to life. I finally just shut it down. |
Keith Kreutzer (Revor)
| | Posted on Wednesday, January 08, 2003 - 10:49 pm: |
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The one thing i thought might be worth a word of caution is the cats... All those chunks of carbon seem like they would beat the snot out of the cats... |
Corey Shuman (One_Bad_Rover)
| | Posted on Thursday, January 09, 2003 - 01:04 am: |
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Correct me if Im wrong but it seems to be the concensus that if you always go with premium you shouldnt see a problem.(114k on a 96. no carbon issues) But should you have a problem, use Seafoam, suck it in to the motor off of a vacuum line until it stalls, use the whole can, let it sit for about 15 minutes, no longer than 20. Then restart, it will be a little difficult, but when it does start you will get a lot of white smoke,this is all the bad stuff, carbon, oil deposits in your top end, drive at high RPM until no smoke is visible. I do this every 6 months just to keep it running right, but I do it with my bimmer and my 66 chevelle, never had any build up problems with any of em. Good Luck!! |
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