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Unread 07-08-2010, 09:26 PM   #31
Sundowner
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It has to do with lowering underhood temperatures, yes...my real interest is in lowering the manifold temperature and keeping less of a load on the cooling system.

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Unread 07-08-2010, 09:28 PM   #32
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A few weekends ago I wheeled all weekend in the Badlands and I was one of a couple of Jeeps experiencing vapor lock...I had this same issue last year in Uwharrie.

I need to remedy all of this.
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Finesse in crawling looks way cooler than momentum.
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Unread 07-08-2010, 10:13 PM   #33
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Quote:
Originally Posted by Apex View Post
A few weekends ago I wheeled all weekend in the Badlands and I was one of a couple of Jeeps experiencing vapor lock...I had this same issue last year in Uwharrie.

I need to remedy all of this.
Are you sure it's vapor lock? I've read it's extremely rare in fuel injected vehicles.
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Unread 07-08-2010, 10:23 PM   #34
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Start on the second try, would barely idle, had to kind of smash the gas peddle to blow it out and get it to idle.

All symptoms were amplified by 100 when trying to start it with the ac on.
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Finesse in crawling looks way cooler than momentum.
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Unread 07-09-2010, 01:16 AM   #35
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What is vapor lock??
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Unread 07-09-2010, 01:19 AM   #36
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Originally Posted by stogie25 View Post
I did home made vents. Using my Scangauge II to monitor the intake temperature the vents lowered the temperature approximately 30 degrees. I had my hood off last week while it was getting repainted, and the temperature went down another 30 degrees on average.


How did you attach the screen thats inside the hood?
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Unread 07-09-2010, 01:19 AM   #37
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Originally Posted by Robert J. yates View Post
... I have my tranny cooler separated out of the radiator...
How did that work out for your tranny? Did you notice a big drop in tranny temp??
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Unread 07-09-2010, 06:11 AM   #38
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Originally Posted by Border Dave View Post
Are you sure it's vapor lock? I've read it's extremely rare in fuel injected vehicles.
there was actually a tsb about it for some of the later xj's, so its possible with the 4.0's. I have heard it has to do with the gas boiling in your fuel rail. A common fix is to acutally header wrap your rail, or to install louvers like these
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Unread 07-09-2010, 07:47 AM   #39
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Originally Posted by bmxrules39 View Post
How did you attach the screen thats inside the hood?
i used RTV sealant on mine.
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Unread 07-09-2010, 07:56 AM   #40
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Originally Posted by bmxrules39 View Post
How did you attach the screen thats inside the hood?
The screen sticks in at the bottom and the back. I used black duct tape for the top and the front.
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Unread 07-09-2010, 10:14 AM   #41
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Quote:
Originally Posted by bandit455 View Post
there was actually a tsb about it for some of the later xj's, so its possible with the 4.0's. I have heard it has to do with the gas boiling in your fuel rail. A common fix is to acutally header wrap your rail, or to install louvers like these
That is exactly what it is.
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Quote:
Originally Posted by bddisi View Post
Finesse in crawling looks way cooler than momentum.
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Unread 07-09-2010, 10:47 AM   #42
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Quote:
Originally Posted by Sundowner View Post
It has to do with lowering underhood temperatures, yes...my real interest is in lowering the manifold temperature and keeping less of a load on the cooling system.
One quick way to reduce intake and manifold temps is to wrap the intake tube with header wrap or a insulated foil backed product from Thermotec. That right there dropped my intake temps 50*.

As for the person who asked about separating my tranny cooler out from the radiator.... I live in a desert so I am not to worried about cold temp warm up. With dual coolers and 1 of them fan driven.... My trans temps are typically in the 150-165* range with the fan rarely engaged.
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Unread 07-09-2010, 11:03 AM   #43
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Fifty degrees??? You gotta be kidding me...
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Unread 07-09-2010, 11:04 AM   #44
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Quote:
Originally Posted by Robert J. yates View Post
... My trans temps are typically in the 150-165* range with the fan rarely engaged.
I can only dream of getting those figures here I am gonna give it a try in bypassing the radiator though !!
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Unread 07-09-2010, 11:08 AM   #45
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Quote:
Originally Posted by Robert J. yates View Post
One quick way to reduce intake and manifold temps is to wrap the intake tube with header wrap or a insulated foil backed product from Thermotec. That right there dropped my intake temps 50*.
That is brilliant. My current "hot air intake system" does not lend itself to that, but it is a really good idea.

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