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Old 08-11-2011, 06:27 PM   #1
Join Date: Jul 2011
Location: Gainesville
Posts: 9
Having Problems!!! Need Help!!!

I just bought my 94 YJ 2.5L 5 speed on July 28th. I have been driving it daily with no problems. Earlier this week I was cruising along in third, when I felt it kind of hiccup. The next day it did it a little more often. I decided to change the plugs. I got four autolite platinums ( I know I know the originals would have been just fine. I understand that the platinums are just a waste of money, but what could it hurt? ) anyways, I also changed the plug wires while I was at it because they looked worn. I put some Rislone injector cleaner in the tank as well. The problem seemed to go away at first but is now happening more frequently now that I have driven it more. It first happened in third like I had stated before, but it happens in all gears. The best way I can describe the noise is a hiccup. It acts like it wants to die, and it only lasts for what seems like a second. Any and all help is greatly appreciated. Thanks in advance.

My thoughts:
1. Bad or clogged injectors
2. Water in the fuel tank
3. Possible engine miss?

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Old 08-11-2011, 06:56 PM   #2

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I would go get a free code scan an autozone or the like.. It will give a better idea perhaps of what's going on. Could be anything, bad 02 senor to bad TPS.

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Old 08-11-2011, 07:08 PM   #3
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Thanks, I will definitely do that. Anyone else have anything to add?
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Old 08-11-2011, 08:48 PM   #4
Join Date: Jul 2011
Location: Gainesville
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I am sorry if I am bothering anyone, but I really need advice. It is my daily driver, and I am afraid to keep running it in fear of the problem getting worse to the extent of breaking my bank.
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Old 08-11-2011, 08:56 PM   #5
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Time for a tuneup!

Change your cap/rotor, as well as the wire going from the dist. to the cap. Change your fuel filter. New air filter (they're cheap, like $6). Oil change and then run SeaFoam in your tank.

Also, get some carb cleaner and start spritzing it around the vacuum lines to check for vacuum leaks. If it bogs down, then you've found your culprit.

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Old 08-11-2011, 09:01 PM   #6
Join Date: Jul 2011
Location: Gainesville
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I appreciate it. Have you been through the same hiccup problem before?
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Old 08-12-2011, 05:29 PM   #7
Join Date: Jul 2011
Location: Gainesville
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I went to an off road specialist today, and he said it was most likely not a vacuum problem otherwise the rpms would rise. Which is not happening. I am leaning towards a distributor problem. Any thoughts?
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Old 08-12-2011, 05:45 PM   #8
Join Date: Mar 2011
Location: West Bloomfield, MI
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1st off if the check engine light is not on there will not be any codes (autozone might not be able to help)
2nd its a OBD 1 system all you need to do to get the codes is turn the key to On then Off 4 times then the check engine light will blink out the code that is in the system.

The SeaFoam is a good idea if you have a lot of carbon build up on the valves you can pull a vacuum hose off that is going to the intake and suck the SeaFoam right out of the can just to where the engine stalls out then let it set for 20-30 mins then run the hell out of it (make sure you are out side, nice smoker for a little bit)
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Old 08-18-2011, 04:03 PM   #9
Join Date: Jul 2011
Location: Gainesville
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Would the distributor be the problem if it had trouble cranking every now and then. It still has a hiccup like stated before. I would just like to know if that narrows it down at all.
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Old 08-18-2011, 04:26 PM   #10
Join Date: Aug 2011
Location: Utah
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Hiccup is a pretty tough term to diagnose. A "hiccup" could sound liek a firing issue to one person, or a fuel issue to another. You can get codes without a check engine light. Do the On-Off-On-Off-On and get the from the flassing check engine light.

Example 12 & 33 would be 1 quick flash then short pause then 2 quick flashes ... Another pause ... 3 quick flashes then short pause the 3 quick flashes.
I think 12 and 55 is the beginning and end of a sequence, so you can ignore those two.

Cap and Rotor are awefully cheap, and most high mileage vehicle are probably in need. I'd definitely do those and the fuel filter on safety sides.
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Old 08-18-2011, 05:16 PM   #11
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Did this problem start shortly after getting fuel? Water in the fuel will cause misfires and depending on the amount of water, it will get worse.
If you are changing the fuel filter check that for water or place an empty clear container under the disconnected fuel line and turn the key on for a few seconds, better yet have someone else do it while you watch. Let it sit for a few minutes, if there is water it will separate ...
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Old 08-18-2011, 08:17 PM   #12
Join Date: Jul 2011
Location: Gainesville
Posts: 9
I just replaced the distributor cap, and the problem has dissapeared for now. It is driving wonderfully, if the problem reappears I will move on to the rotor and fuel filter. Thank you for all of the input guys.

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