CRD Surging at stop.

kjjet · **Posted:** Thu May 23, 2013 9:22 am

With my CRD running great. I have noticed a slight internment surge the last month or so. The RPM's do not move. It just feels like the transmission is trying to move the Jeep.

Conditions when i feel it:

Stopped, Warm engine and in gear. Air on or off makes no difference. Placing it in N stops the surging.

I think it is a Trans issue. I changed the Filters and ATF-4 fluid under 10k ago. Thinking there must be a internal leak?

Thoughts??

Hexus · **Posted:** Thu May 23, 2013 9:58 am

When you start it what RPM's does your gauge spike to?

Did you install a Transgo or any other upgrades or did you just do the filters and fluid without dropping the Solenoid Pack?

Have you checked the fluid level every couple days after your work to ensure the fluid is the right level?

There are a lot of people that say the transmission needs to be "burped" but if you fill the screw-on filter with fluid before you attach it you can eliminate most of that.

Your engine will surge if the temperature sensor on the back of your thermostat isn't hooked up or is going bad.

Just thoughts.

kjjet · **Posted:** Thu May 23, 2013 10:24 am

It spikes up to 1000 as per the GDE tune.

No trans upgrades or tunes. Standard filter's and fluid changed only.

Back at 50k or so the Dealer pulled down the trans and rebuilt it under warranty. At that time it was slow to move when cold and shifting bad. They fixed that.

You say...Your engine will surge if the temperature sensor on the back of your thermostat isn't hooked up or is going bad

I would think this would happen in "N" also, if it was a engine related issue?

flash7210 · **Posted:** Thu May 23, 2013 11:28 am

With the engine warm and trans in D, the transmission should be fully engaged.
Shouldn't make any difference if are stopped with your foot on the brake or slowly idling forward.
With your foot on the brake, popping it into N will cause a slight rise in RPM and a noticeable change
in engine tone as the load is released from the engine.
I dont see how the transmission could surge unless its not maintaining full engagement.
If its not maintaining full engagement, then you should be seeing slight changes in RPM and hearing
the changes of engine load.

Are the brakes having a tough time keeping the vehicle stopped while in D ?
Are you having to push the brake pedal harder during the surge?

kjjet · **Posted:** Thu May 23, 2013 11:49 am

You can hear a slight change in engine idle that dose not show up on the RPM's.
You don't have to push on the brakes much harder. But you can feel it.

I was just out checking the fluid level again. Jeep was driven a few hours ago. Started, Level was slightly above the cold line. Decided to add 1/2 qt. Just don't want to overfill. Going to drive it at lunch time and see if anything changes.

flash7210 · **Posted:** Thu May 23, 2013 12:05 pm

Fill it up to the HOT line. A little over filled isn't bad. A lot over filled means the fluid will find a place
to escape. Usually out the breather, or sometimes foaming out the dipstick tube, or worst case, out
the tailshaft or input seal.

I cant remember if you need to check fluid level in P or N. I always check in N.
Sometimes, after a transmission service, I will set the P-brake and check it in D.
Just make sure the P-brake actually works. :wink:

kjjet · **Posted:** Thu May 23, 2013 12:21 pm

I checked it hot a few days ago, Yes moved it back and forth between gears a few times and place in Park, i also checked in N. It dose not seem to make a difference. The level was 1/2 way up between cold and hot.

Maybe it was just a bit low and caused internment surge?? I will advise later. Thanks!!

DOC4444 · **Posted:** Thu May 23, 2013 11:39 pm

The normal level when cold and not running is about an inch to an inch and a half above the "HOT" mark. I think you are running with not nearly enough fluid.

DOC

Hexus · **Posted:** Fri May 24, 2013 7:40 am

It has been said many times, and is absolutely true that our Dipsticks for our transmissions are entirely TOO darn LONG.

If your dipstick is only showing 1/2 full at hot, you are low. Add a quart.

kjjet · **Posted:** Fri May 24, 2013 9:05 am

Ok....you guys are correct. After adding 1/2 QT the level is at max hot now. NO MORE Surging at stop.

The crazy part is after driving this thing for 70k and having the trans level at the same place all that time with no issues, it acts up now?

I'm not complaining. Thanks for the help!!

painemann · **Joined:** Sat Dec 20, 2008 7:02 pm **Posts:** 607

kjjet wrote:

Ok....you guys are correct. After adding 1/2 QT the level is at max hot now. NO MORE Surging at stop.

The crazy part is after driving this thing for 70k and having the trans level at the same place all that time with no issues, it acts up now?

I'm not complaining. Thanks for the help!!

I have having an issue like this, but I have the "manual, don't push the clutch in at a stop" symptom. I just did a filter swap and fill back up, the trans shifts well but from what I read I only needed 5qts to top it back off. Well I am at 8qts now and still not full after the filter change and fresh fluid top off. I am going to do as stated, over fill slightly since I have still getting the no clutch symptom.

CRD Surging at stop.

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