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Unread 02-21-2013, 07:06 PM   #16
DUX4LIFE
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The one one my jeep is flat.

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Unread 03-01-2013, 04:07 PM   #17
jhar10423
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Carb on 4.0?

Hi, Ive been embattled with a 88 yj 4.2 to 4.0 swap. My old 4.2 has climbed its last hill and now is being replaced by a 03 4.0 out of a grand cherokee. Having gotten the motor cheap i'd like to use it but now I am at the point that i would like to ditch the f.i. and go back to a carb. What I would like to do is find a carb to retrofit my stock 4.0 intake manifold. i think if i can find a carb in the 400-500 cfm range with a base size of no greater than 3" square I might be able to cut a square in the manifold tread some screws in and be in luck. Have you ever heard of anyone doing this? thanks
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Unread 03-01-2013, 04:11 PM   #18
walkerhoundvm
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No. No one in their right mind would switch from MPFI to a carb.
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Unread 05-26-2013, 02:46 PM   #19
rainjeep
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I went to NAPA today looking for that 6.5 pv for my 2150 Motorcraft and no luck. I got my new 47 jets today but I can't replace them yet due to the ones on the carb having a cap on and I don't know how to take off. I can't get to the jets without removing them, they look like brass caps.
Did anybody have this problem removing these caps off?
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Unread 08-20-2013, 12:55 PM   #20
JeepMonkey
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Couple of questions:

1. Is there anyway tell which PV I currently have on my MC 2150?

2. A part number for the 6.5 PV would be great. I found a few on the NAPA website but it wasn't immediately clear which would work for my application.

I have almost the same problem as the OP and the PV diagnosis sounds spot on. I too bought my carb from the eBay guy and have yet to get a response from him about the issue. Not saying he won't respond, just that he hasn't yet.

Hopefully he will because he sure does talk a big game about after sale support.
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Unread 08-20-2013, 01:35 PM   #21
scrapman
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Quote:
Originally Posted by JeepMonkey View Post
Couple of questions:

1. Is there anyway tell which PV I currently have on my MC 2150?

2. A part number for the 6.5 PV would be great. I found a few on the NAPA website but it wasn't immediately clear which would work for my application.

I have almost the same problem as the OP and the PV diagnosis sounds spot on. I too bought my carb from the eBay guy and have yet to get a response from him about the issue. Not saying he won't respond, just that he hasn't yet.

Hopefully he will because he sure does talk a big game about after sale support.
Any holley 6.5 single stage power valve will work. A quick google of holley 6.5 power valve turned up several places to buy. Here is one:

http://www.summitracing.com/parts/hl...FfFj7AodlXYAww

The only way to tell which one you have is to take it off and see what numbers are stamped on it.
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Unread 08-20-2013, 02:09 PM   #22
drespecki
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Hmmm, wonder what is in mine? I have one of those brand new 2150 units he found somewhere and have a stumble like you mentioned...
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Unread 08-20-2013, 02:20 PM   #23
superj
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The power valves are on the wall at any auto parts store in the performance section. They usually have more sizes then just 8 or 8.5 which is what comes in the kits, I think.

You can pull those brass caps off
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Unread 08-20-2013, 02:52 PM   #24
JeepMonkey
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Quote:
Originally Posted by drespecki
Hmmm, wonder what is in mine? I have one of those brand new 2150 units he found somewhere and have a stumble like you mentioned...
Funny. Mine is new too! I wonder how he finds all these new? Or are they "new"?
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Unread 08-20-2013, 03:31 PM   #25
drespecki
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Mine really does appear brand new...not refurbed, sandblasted, etc... Looks factory.
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Unread 08-20-2013, 04:41 PM   #26
capt205
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Chinese reverse engineered.

Seriously though...I got an MC2150 from him, and so far, I'm satisfied with it.
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Unread 08-23-2013, 11:49 PM   #27
drespecki
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Has anyone confirmed what size is in the 'factory' 2150 carb? I think I need to change over to the 6.5 power valve and 46 jets but have no idea what is in the carb I bought from him. It is a 1.08 venturi though...
Anyone?
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Unread 08-24-2013, 09:02 AM   #28
jeepwhore
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Quote:
Originally Posted by drespecki View Post
Has anyone confirmed what size is in the 'factory' 2150 carb? I think I need to change over to the 6.5 power valve and 46 jets but have no idea what is in the carb I bought from him. It is a 1.08 venturi though...
Anyone?

On my carbs the jet size is stamped in the top of the jet. PV, couldn't tell you what comes in them stock.
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Unread 08-24-2013, 09:43 AM   #29
capt205
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You're going to have to pull the top off and see what is stamped onto the jets. If I recall correctly, the eBay guy tries to jet and tune your carb based on the info you provide when ordered.

Its close...but fine tuning makes it better. You have to do this with any carb you buy, as there are just to many variables to factor in. Once you determine what is in the carb buy a couple sizes of jets higher and lower then swap them out till you feel its at its best.

Tuning a carb is becoming a lost skill, and it usually takes a couple of tries to get it right, but its worth it.
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Unread 08-25-2013, 10:51 AM   #30
drespecki
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Sounds like the jets have an ID stamped on them? Does the power valve have anything on it to ID it ? Hate to buy a bunch of them that I don't need..
Thanks..
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