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Unread 05-04-2012, 03:47 PM   #1
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Join Date: May 2012
Posts: 1

Ello! So jus got my 1st jeep 2 wks ago. It's an 87' wrangler, super nice 65000mi only! Has 4" lift & 33 tires. Straight V6. It has to be "pumped" 2 start up & "sputters" sometimes when i turn it off. It starts up @ bout 9 rpm but raises to like 12. I'm only gettin bout 25mi per 1/4 tank of gas. I lowered the idol but then it was dying so raised it again & hasn't died since. I am wondering why I'm gettin such bad gas milage?

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Unread 05-04-2012, 04:20 PM   #2
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1994 ZJ 
Join Date: May 2012
Location: grand island, nebraska
Posts: 88
Im no expert on these kinds of things, but i know that if a carborated engine has sat for a long time, the carborators will have something happen internally, and need rebuilt.

before you do anything, i would advise waiting for someone else to post.
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Unread 05-04-2012, 08:01 PM   #3
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1995 ZJ 
Join Date: Dec 2010
Location: Norman, OK
Posts: 2,311
A number of things could be wrong, carb problems, eng timing, vac leaks etc. I would start with running a good quality cleaner (something like seafoam) in the fuel tank and spray some carb cleaner through the carburetor too. Also can run a can of seafoam down the carb or through a vac line too. Look up a few threads on here about seafoam, most of them are probably on the 4.0 but the application will be about the same.

The cleaning stuff mentioned above can be done easily and cheap. It could be that the carb is needing a rebuild, or simply worn out. Engine may need a good tune up too (plugs, wires, cap, rotor, fuel/air filters etc) Spray carb cleaner around vacuum lines and gaskets at carb and intake manifold to find possible vac leaks.

Two things to google are "nutter bypass" and "4.2 HEI upgrade" Those two things alone really woke up my old CJ which was basically the same engine and carb that you have.
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Unread 05-05-2012, 08:40 AM   #4
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1997 ZJ 
Join Date: Aug 2011
Location: Petoskey, Michigan
Posts: 640
You need to get a miles per gallon to start. Check the choke, should be full open when heated up and closed when cold. I would pull the carb and clean it, make sure things are moving freely. Before you wake up the devil read a thread on here " spark plugs fouling"
gunner44 is offline   Reply With Quote Quick reply to this message

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