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Old 08-17-2010, 08:06 PM   #1
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TJ Hesitation while driving. Need you help!

Hi All, been cruising the site for a while and there is a lot of great info. I am a long time XJ owner and had a couple YJ's but am a new TJ owner. I just got a 99 with 120k on it. Straight Six, manual transmission.

I am running into a problem I can't figure out. It idles fine and when I start to move it's ok for a little bit but once I get to the top of first and onward there is a hesitation. It's almost like it is getting chocked up. What is driving me nuts is that it won't do it every time. I can hop in it right now and drive to the store (2 miles) it will do it the whole way. I can then leave and go to my brothers house (18 miles) it won't do it at all. But on the way home it will do it the whole way back.

Highway travel when I drive it to work it will never do it really.

The air filter is a clean K&N, I did the plugs, wires, cap and rotor, ran some dry gas through it. I can't chase this out. When I am getting the hesitation I can push in the clutch and rev the engine fine. So it seems that it is only under load that I have the issue.

I am not sure what it could be, I know that the TJ doesn't have a fuel filter to change. Could it be a weak fuel pump? Why can I rev it fine and idle ok too?

No check engine light and it passed for inspection fine.

I am lost on this, was hoping you guys could help out.

Thanks!

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Old 08-18-2010, 12:44 AM   #2
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I'd start with a fuel pressure gauge hooked to the fuel rail. Try revving and holding it at 2500-3000 for a minute or two.

Thinking it is a weak pump or a restriction in the line. If the pressure drops after a moment or two, it verifies it.

Unloaded may not be enough to see it drop. Use a longer hose on the gauge and mount it where you can see it while driving, duplicating the problem.

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Old 08-18-2010, 08:54 AM   #3
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Thank you! I'll definitely try that out and see. Better than dropping the tank at least. Could it be a loose connection maybe too?
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Old 08-24-2010, 11:24 PM   #4
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A new piece to this puzzle seems to be showing up. I find that when the hesitation starts, if I shut the jeep off (while still moving down the road at 30 mph) and turn it back on I can continue without issue.

This is extremely odd. Still working on checking the fuel pressure.
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Old 08-26-2010, 11:47 PM   #5
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So, how'd it turn out?
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