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Unread 04-20-2013, 04:46 PM   #1
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4.2inline 6 modfication prblem

I have 32/36 weber carb, Clifford manifold with split headers, CRT performance distributor, fuel regulator, 35 inch tires with 3.73 gears. After doing all the modifications it still runs the same . No throttle responce . Can anyone help me out with what is wrong.

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Unread 04-21-2013, 09:05 PM   #2
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What is your timing set at, and where did you hook up the vacuum advance hose?
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Unread 04-21-2013, 09:24 PM   #3
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I'm using the primary vacuum and I had the timing set at 9 but bumped it to 12 today
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Unread 04-21-2013, 09:30 PM   #4
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What are you calling primary vacuum? There is manifold vacuum and ported vacuum. Are you setting the timing with the vacuum line attached or disconnected from the distributor?
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 04-21-2013, 09:47 PM   #5
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Using the ported vac and did unhooked . The only difference I've noticed since doing all this is it runs smoother . Other than that its the same
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Unread 04-21-2013, 10:04 PM   #6
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Bummer!!

What elevation are you at? Was the Weber jetted for your 4.2 as delivered?
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 04-21-2013, 10:20 PM   #7
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We put in new jets once I received it. It ran really bad when it first got here. You can mash it to floor the jeep never comes alive.
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Unread 04-21-2013, 10:21 PM   #8
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Is the distributor advancing the timing from static when you rev it? You know, from where you set it at 12*?
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 04-21-2013, 10:23 PM   #9
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Yes it is .
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Unread 04-21-2013, 10:25 PM   #10
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Got a catalytic converter?

How much total advance are you getting?
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 04-21-2013, 10:26 PM   #11
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I have a cat when we did the new exhausts I had to put the cat back on. I don't remember the numbers on the timing
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Unread 04-21-2013, 10:30 PM   #12
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I'm going to bed now. Here's something to ponder. This, and the link below.

CRUISER’S VACUUM TEST FOR EXHAUST RESTRICTION

Your vacuum gauge should come with an instruction booklet outlining the procedure. Hook the vacuum gauge up to a source on the intake manifold. Start the engine and note the vacuum reading. Usually 17 to 21 inches of vacuum. Throttle the engine up to 2,000 to 2,500 RPM for 20 seconds or so and the vacuum reading should stabilize to the same reading you got at idle. Let the throttle snap shut. The vacuum reading should shoot up about 5 inches of vacuum higher for a second and then come quickly down to the original reading. If the vacuum reading stays high and comes down slowly with jerky needle movements, you have an exhaust restriction.


http://www.classictruckshop.com/club...ts/vac/uum.htm
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 04-21-2013, 10:32 PM   #13
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Thanks for the help I will try it tomorrow
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