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post #1 of (permalink) Old 09-19-2005, 11:34 AM Thread Starter
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Gas Mileage question

I recently purchased a 1989 Jeep Wrangler YJ 2.5 4 cyl. The thing seems to run great. I changed all the fluids and lubed it up when I got it and everything seems to be running great. I bought it for my girlfriend who loves it now. The only problem is that the gas mileage seems to be wayyyyyyy low. It looks like its getting about 12 miles to the gallon. I do have oversized tires on it. They are 31" tires, so I'm sure that the odometer is a little off but I wouldnt think it would be that far off. Also, the EGR valve on the jeep is the wrong one so I have it plugged for now until I get the right one.
I have two other Jeeps, both of them are 95 XJ Cherokees with 4.0 liter engines and both get better gas mileage than this YJ. One of my XJ's has stock tires and gets about 17 mpg. The other has 32" tires and still gets about 14 mpg.
If anyone has any ideas or thoughts, let me know.
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post #2 of (permalink) Old 09-19-2005, 12:07 PM
 
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Re: Gas Mileage question

First check your tire pressure. It's a simple thing but easily overlooked.

besure to include the dire ratio difference. I'm sure LEVE will post a good link soon.

What type of tires did you buy MT or AT's. The tread pattern will have an effect on your rolling resistance.

Jeeps can't go 75 MPH and get great gas milage. I get 18 with my CJ but I don't usually go over 55 mph.
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post #3 of (permalink) Old 09-19-2005, 04:27 PM
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Re: Gas Mileage question

This has been brought up many times here on this subject. If you don't regear when going oversized tires your mileage is about norm for the 4 banger.
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post #4 of (permalink) Old 09-20-2005, 11:50 AM Thread Starter
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Re: Gas Mileage question

Thanks for the advice. I did check the tire pressure and it is at 32 lbs each. the tires are A/T the gearing is stock, but I thought it would still get better mileage than what its currently getting. I am going to pick up some rims today, they are 15x8 with a 5x4.5 bolt pattern. I think thats the right bolt pattern for this jeep. And I think that I will probably go with 30x9.5 or 238/75/15 A/T tires. She really only uses this jeep on the street and she will probably get a better ride and better gas mileage.
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post #5 of (permalink) Old 09-21-2005, 08:53 AM
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Re: Gas Mileage question

New plugs, new wires, rotor, cap. I did that when I got my 93' yj and it made a big difference.

I treated the gas and crankcase multiple times with engine and fuel system cleaner. Changed the oil twice to get rid of sludge. It runs great now, and with 31x11.5 tires I'm gettin about 16mpg.

Hope that helps.
post #6 of (permalink) Old 09-21-2005, 01:31 PM Thread Starter
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Re: Gas Mileage question

Hey, thats great. I would be really happy if i could get 16 MPG. I was told that the plugs, cap etc... had been recently changed, but I'll take a look anyway. I'll get some good platinum plugs for it.
Thanks for the info. [img]/ubbthreads/images/graemlins/smile.gif[/img]
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post #7 of (permalink) Old 09-21-2005, 02:30 PM
 
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Re: Gas Mileage question

Then check the timing. Someone could of screwed that up also.
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post #8 of (permalink) Old 09-22-2005, 11:04 AM Thread Starter
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Re: Gas Mileage question

I will check the timing and post my results.
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