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Old 02-04-2014, 03:41 PM   #1
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Need advice on engine problems

What's up guys? I need some advice on an engine problem I've been having. I have an 05 wrangler x I6 that stalls briefly once it warms up. It doesn't do it all the time, usually it happens after it rains. If I'm cruising over 45 my engine feels like It cuts off and then back on. When this happens my tach drops 3-400 rpms and just keeps doing this over and over. It literally feels like someone tapping the brakes when it happens.

I'm trying to attach a video but I don't guess I can from my phone.

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Old 02-04-2014, 03:59 PM   #2
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Any codes thrown?

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Old 02-04-2014, 04:21 PM   #3
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No codes
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Old 02-04-2014, 07:07 PM   #4
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Can anyone else help?
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Old 02-04-2014, 07:18 PM   #5
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What frequency does this repeating cut-out happen, is it every few seconds, or every few minutes and how long does it last each time it occurs? I assume the engine doesn't actually stall if your tach only drops 3-400 rpm. Does any action you take seem to make it stop happening?
Is your rig an automatic or manual and does it happen in every gear?
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Old 02-04-2014, 08:44 PM   #6
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It's not all of the time but usually happens during or after the rain. It only happens over 45 mph and every 5-10 seconds. Sometimes it only happens 2 or 3 times and sometimes it doesn't stop until I park my tj. I have an automatic and it only happens at cruising speed after my torque converter locks up. As far as making it stop, sometimes I can stomp it and it stops.
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Old 02-04-2014, 08:52 PM   #7
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It used to happen much worse and go into limp mode throwing 3 codes. I can't remember what they were. I changed the cps and that solved it for a few weeks. Then it started again. I took it to the stealer ship throwing the codes with the cel on. After multiple days they called and said they couldn't duplicate the problem. No stalling and no codes. It was fine for a while but started bucking again.
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Old 02-04-2014, 09:10 PM   #8
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Originally Posted by cnolan76 View Post
It's not all of the time but usually happens during or after the rain. It only happens over 45 mph and every 5-10 seconds. Sometimes it only happens 2 or 3 times and sometimes it doesn't stop until I park my tj. I have an automatic and it only happens at cruising speed after my torque converter locks up. As far as making it stop, sometimes I can stomp it and it stops.
That sounds like Torque Converter Shudder. Google it. It happens when your lock up clutch starts slipping and catching. Can make it feel like the engine is misfiring really bad. You can test for this easily. Next time it happens, lightly touch the brake pedal for a second and see if it stops until the torque converter locks up again.
This can be caused by having the wrong automatic transmission fluid in the tranny like if you had accidentally used dextron II instead of ATF +4. Or it could be that the lock-up clutches are just worn and you need a new torque converter. Had this exact same thing happen to my XJ.
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Old 02-04-2014, 09:11 PM   #9
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If that turns out to be your problem, I was able to buy a little more time out of my torque converter by flushing the tranny and then adding some BG transmission conditioner, but it ultimately came back and I had to replace the torque converter.
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Old 02-04-2014, 09:20 PM   #10
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Originally Posted by cnolan76 View Post
It's not all of the time but usually happens during or after the rain. It only happens over 45 mph and every 5-10 seconds. Sometimes it only happens 2 or 3 times and sometimes it doesn't stop until I park my tj. I have an automatic and it only happens at cruising speed after my torque converter locks up. As far as making it stop, sometimes I can stomp it and it stops.
Again, if it's your torque converter lock up clutch slipping and grabbing, it stops when you stomp it because your TC unlocks for the downshift. And, it usually gets worse when the tranny is hot and if you are pulling aload, like going up a slight incline.

A good mechanic should be able to confirm a diagnosis. Certainly a transmission shop can.
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Old 02-05-2014, 08:11 PM   #11
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Lj Dave I thank you for the response but I've got a question about it. If it's the torque converter, would it only happen in the rain or really humid days? That is the only time it happens.
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Old 02-05-2014, 08:23 PM   #12
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I'd be surprised if humidity would really make much difference, and it could be coincidence. But the fact that it happens after your TC locks up, makes agood case. When my XJ had that problem I actually brought to a mechanic to check on an engine misfire, and he correctly diagnosed it as the TC lock up clutch by driving it until it started to happen, then quickly tapping the brake pedal, without lifting from the accelerator and it immediately stopped until after the tc locked up again. He did this several times and the only thing that would react that way is the TC lock up clutch.
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Old 02-05-2014, 08:59 PM   #13
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Thanks man, I'll get it checked out a report back.
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Old 02-06-2014, 02:23 PM   #14
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I know I only have a 4 banger but I had the exact issue you are describing. I had 2 issues. A bad TPS was throwing codes and causing it to feel like I would let off the gas. AND I had water seeping into my spark plug boot and causing the plug to arc out. It would only happen after a rain or snow. I found condensation all over the inside of my spark plug boots that would drip down and arc the spark. The fix was to pull the boot and dry out the sockets, then check the plugs to see if they burned up from the arcing (mine did) then liberally coat the spark plug boot plug with dielectric grease, and grease up the outside of the boot good too. and then grease the ignition posts and plugs too. A tube will set you back 6-7 bucks. Best money I ever spent. Its silicone based so its waterproof and stays goopy even when it gets hot.
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Old 02-06-2014, 04:13 PM   #15
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Sorry for the crappy video, but here is the link.


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