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Unread 07-28-2013, 09:56 PM   #1
TheAron67
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96 Jeep Laredo

I just bought a 1996 Jeep Grand Cherokee Laredo with a replaced long block 4.0 straight 6 cylinder and when I crank it up, until it warms up, it loses power and skips kinda like if you stall out in a stick shift. Ive replace the plugs and wires, cap and rotor, the fuel pump, fuel filter and put BG 44k in my gas tank and Idk what to do. Any Ideas?

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Unread 07-29-2013, 04:52 AM   #2
Holder350
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You have a part that has what is know as thermal failure, which means it works good untill it gets hot.

Most likely culprit is the CPS

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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
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Unread 07-29-2013, 05:14 AM   #3
TheAron67
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It works good once it has warmed up but it feels like it skips and stalls about 30 seconds after I crank it up, only when I first crank it up. Once it gets warmed up its fine
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Unread 07-29-2013, 05:57 AM   #4
Holder350
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Sorry I miss read that

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95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
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You can tell the character of a person in how they treat someone who can do nothing for them.
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Unread 07-30-2013, 07:12 AM   #5
cruiser54
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1990 MJ Comanche 
 
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Try this. Turn the key on, then off 2 or 3 times before going to Start and see if it fires up better.
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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
Refresh*Connections*Before*Replacing*Components
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Unread 07-30-2013, 07:37 AM   #6
TheAron67
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I tried it and it fires up wayy faster and it doesnt skip like it normally does
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Unread 07-30-2013, 07:38 AM   #7
cruiser54
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Fuel pump check valve is bad. You can learn to live with it or replace the fuel pump.
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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
Refresh*Connections*Before*Replacing*Components
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Unread 07-30-2013, 08:01 AM   #8
TheAron67
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So Id have to replace the fuel pump?
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Unread 07-30-2013, 06:10 PM   #9
cruiser54
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Quote:
Originally Posted by TheAron67 View Post
So Id have to replace the fuel pump?
Pretty sure.
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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
Refresh*Connections*Before*Replacing*Components
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