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Steam cleaning your 4.0

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Old 10-27-2016, 03:31 PM   #46
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I did 20 oz. the other day. Did quiet it down some in the valve line. Seems to idle better
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Old 10-27-2016, 03:58 PM   #47
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Originally Posted by XJwonders View Post
He uses 32 oz Mountain Dew cup. Lol
I coulda sworn it was a 64.... oh well.
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Old 12-07-2016, 05:53 AM   #48
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Why is it better to get the carbon buildup out?
What good thing results?
What happens if you just leave the carbon in there?

PHM
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Originally Posted by Jeepin'_Aint_EZ View Post
I've done a seafoam treatment but pulled the vac line off the booster. boy did that sucker smoke for a bit after the shut-down and restart. #mesquitorepellent.

I'd also like to add that the 4.0L is prone to carbon build up. If you've never done a top-end cleaning, than it's highly recommended especially higher mileage engines. To prolong carbon buildup in the future, take your XJ for a high RPM run down the highway time to time.

EDIT* notice I said high RPM run... I feel the need to correct that and mention that this does not mean high speed! Simply wind out first or second gears. You can keep the RPM's high by keeping her out of OD too.
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Old 12-07-2016, 07:45 AM   #49
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Why is it better to get the carbon buildup out?
What good thing results?
What happens if you just leave the carbon in there?

PHM
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Carbon buildup, especially around the valve seats, can cause valves to stick, and can also cause stem seals to wear prematurely if carbon builds up on the stems themselves.
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Old 09-16-2017, 11:44 AM   #50
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Great post. Forgot about this we used to do this in the late 70's to our muscle cars to clean the carbon out of the combustion chambers. Then we added water injection on cars helped with detonation due to higher compression and also helped with mileage.

Thanks again
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