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Unread 01-30-2013, 04:07 PM   #1
smithj156
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1993 YJ Wrangler 
 
Join Date: Jan 2013
Location: pass chirstian, MS
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bad gas mileage

i have a 93 jeep wrangler yj with over 200k on it was towed behind an rv. its got the dang 4cyl in it.. it gets maybe 10mpg is this normal its a 5 spd and i have 30in tires on it what could i do to help my mpg

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Unread 01-30-2013, 04:26 PM   #2
jokerchief462
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1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City, Nevada
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Should be around 15mpg. Tune up maybe.
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Unread 01-30-2013, 04:30 PM   #3
smithj156
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1993 YJ Wrangler 
 
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i know i have some exhaust problems and the axles are stock i want to go with 33s what should for 33 besides lift i got the jeep for a hell of a deal
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Unread 01-30-2013, 04:31 PM   #4
andygio71
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basic maintenance for starters (if you havent done it already), air and oil filters, oil change, plugs, wires, etc. read up on upgrades for your motor (i've got a 4.2 so i'm no expert).

and dont forget, bigger tires tend to hurt gas mileage. also, if your speedo hasnt been corrected for the tires, it will be messing with your mpg numbers
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Unread 01-30-2013, 04:33 PM   #5
ZeroGravity
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1991 YJ Wrangler 
 
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33s aren't going to help your cause.
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Unread 01-30-2013, 04:53 PM   #6
smithj156
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i know but if i put gears in it wont that help
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Unread 01-30-2013, 05:05 PM   #7
Old4X
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Quote:
Originally Posted by smithj156 View Post
i know but if i put gears in it wont that help
Not much. It will be worse, but not as bad as stock
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Unread 01-30-2013, 05:08 PM   #8
flcracker
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1992 YJ Wrangler 
 
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I have 31's and get over 15 and as high as 17 if I'm nice to it....

2.5, 5 speed
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Unread 01-31-2013, 09:49 AM   #9
smithj156
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flcracker how many miles do you have any mods to engine
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Unread 01-31-2013, 10:19 AM   #10
flcracker
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Not sure what mods I do have, whatever it has, it came with most of them. I did go to an electric fan and I do see a spacer under the throttle body but I don't know if it has a 4.0 throttle body or upgraded injectors or what....
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Unread 01-31-2013, 10:23 AM   #11
Que89YJ
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1989 YJ Wrangler 
 
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Exhaust problems = leak in the exhaust manifold = O2 sensor think its running lean = dumping more gas = bad mileage
Fix your exhaust leak and replace your O2 sensor
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Unread 01-31-2013, 03:51 PM   #12
pete1991YJ
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1991 YJ Wrangler 
 
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Quote:
Originally Posted by Que89YJ View Post
Exhaust problems = leak in the exhaust manifold = O2 sensor think its running lean = dumping more gas = bad mileage
Fix your exhaust leak and replace your O2 sensor
X2 this. Do what Que says, along with a complete tune-up. Look for any and all possible vacuum leaks, replace hoses or use clamps. Re-torque and tighen down the intake and exhaust manifold bolts at the cylinder head - they have a known habit of working loose and killing the MPG's.The 4-bangers are very sensitive to these things. Clean out the TB, the IAC, etc. fresh plugs, cap rotor and wires, air and fuel filters, the whole 9 yards.

My 1991 is getting a solid 20 MPG's on 31" tires with stock gears and it goes on the NY thruway. If you want 33" tires then it would be a good idea to re-gear yours. But get it tuned up first.
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Unread 01-31-2013, 08:36 PM   #13
smithj156
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1993 YJ Wrangler 
 
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i didnt see an 02 sensor when i looked the cat looks pretty bad so im going to cut it out and put a new muffler on there... no check engine lights on... the guy i got it from just did a tune up and replaced the fuel pump.. going to replace the fuel fillter again run some seafoam threw it but the spray kind.. also going to check all those bolds any one got the specs for that
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Unread 01-31-2013, 08:39 PM   #14
Que89YJ
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1989 YJ Wrangler 
 
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Did you check the codes the way the link I posted. I hate to keep asking but you should see some codes.
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Unread 02-02-2013, 09:48 PM   #15
smithj156
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what link que89yj
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