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Old 07-22-2010, 08:01 AM   #1
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Can bigger tires cause these symptoms?

OK, I posted this problem before and after several trips to a mechanic, friends looking at it, etc. there has been no reduction in the problem. I have been really thinking and it all basically started after I put the 33" tires on my little 4 cyl.... will having too large of tires for a small motor cause the jeep to hiccough? I will be driving along and all of a sudden she will act like there's no power, it will hiccough and about throw me out of the seat. I had the lift put on and still drove with the 31" tires and had no problem- could still even get it into 5th gear. Now, no way- I haven't used 5th gear since last summer and my gas mileage has decreased at least 4mpg. I'm thinking of putting the old tires back on and seeing if it hiccoughs- could it be that simple? Thanks in advance for any input-
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Old 07-22-2010, 08:13 AM   #2
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If you didn't swap the speedo gears when you put on the tires then your speedo/odo is off, giving you false mpg readings. You're actually getting more mpgs than it appears. But fewer than with 31's. Bigger tires weigh more and make your motor work harder to turn them. You probably put on heavier wheels too, which compounds things further.

I can't help with the hiccoughs. But the simplest thing to do is put the 31's back on and see if they go away. Lifting it shouldn't affect the mpgs.

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Old 07-22-2010, 09:34 AM   #3
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First of all....good job on spelling hiccough(not hiccup) and using the correct term!

On to your issue. You could be loading up the motor so much it is almost flooding it. I have a friend who had similar issues. He regeared his axles and the issue went away.

I say swap the 31s back on and see if it goes away. If so, swap the 33s back on and see if the issue comes back. Try regearing if it does.
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Old 07-22-2010, 10:11 AM   #4
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Well lugging around all that weight in the 33's on the 4cyl. could casue some issues and decrease mileage, but I wouldn't think that it would cause your engine to shutter that hard...have you had your tranny looked at? almost sounds like something there or if you didnt regear for 33's it might give you trouble. Maybe a fuel flow issue at higher rpm, TPS sensor?
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Old 07-22-2010, 10:39 AM   #5
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Awesome thoughts/ideas. Thanks so much
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