shaking engine!! felt like heavy misfiring

Endurance · **Posted:** Sun Jul 29, 2007 12:39 pm

Last night I had my first ebcounter with the "shacking engine" syndrom.

I was going down the road when I suddenly lost almost all my power. I pulled in the parking lot and the Jeep felt like it was running on 2 cylinders. I opened the hood and the engine was shaking back and forth, running extremely odd. I turned it off and back on and everything was fine.

I think that there were people on here who experienced the same problem. One guy even posted a video a while back.

Anyone knows whats causing this?

Cowcatcher · **Posted:** Sun Jul 29, 2007 1:50 pm

The only time I experienced it was a hot day running slow, less than 1/4 tank of fuel after making a low speed, hard right turn. I couldn't get a code if there was one.

Some call this "limp mode" but it is not. True "Limp" is a program feature of the TCU or one of the other microprocessors to protect the transmission after it gets certain trouble codes to protect the transmission. This is fuel or combustion related.

cocojo · **Posted:** Sun Jul 29, 2007 4:50 pm

I just had the same thing happen to me today. 3/4 tank of fuel hot day and the vehicle felt like it has no first gear and no power had the engine to floor. Felt like tranny or turbo problem. Called for a tow to my dealer when the truck arrived the vehicle started right up and felt ok. Had them take the vehicle to dealer to be checked. My wife wants me to dump the liberty because of all the problems with them. The vehicle howels at high speed that will drive you nuts. Sounds like a flute but real loud. I am getting tired of these issues and as much as I like the vehicle I don't know how much longer I can tolarate these issues. When I take it to the dealer they never find anything.

DarbyWalters · **Posted:** Sun Jul 29, 2007 4:57 pm

Sounds more like AIR getting into the FUELING system

Joe Romas · **Posted:** Sun Jul 29, 2007 5:46 pm

Could be what MrMopar is discribing back on page 8 of this thread about what happens when the fuel temperature getts above a certain temperature :lol:

BlackLibertyCRD · **Posted:** Sun Jul 29, 2007 6:01 pm

Endurance wrote:

Last night I had my first ebcounter with the "shacking engine" syndrom.

I was going down the road when I suddenly lost almost all my power. I pulled in the parking lot and the Jeep felt like it was running on 2 cylinders. I opened the hood and the engine was shacking back and forth, running extremely odd. I turned it off and back on and everything was fine.

I think that there were people on here who experienced the same problem. One guy even posted a video a while back.

Anyone knows whats causing this?

Yeah that will be fuel system problem, either air or starving for fuel flow from filter getting clogged. I run a pre-filter and that lets me know it's time to change it. You should see the junk or color of the pre-filter and you would know why. BTW A pre-filter is a lot cheaper and faster to change. Make your factory filter last twice as long.

nursecosmo · **Posted:** Sun Jul 29, 2007 10:33 pm

Cowcatcher wrote:

Some call this "limp mode" but it is not. True "Limp" is a program feature of the TCU or one of the other microprocessors to protect the transmission after it gets certain trouble codes to protect the transmission. This is fuel or combustion related.

The ECU will also throw the engine into limp mode for fuel, turbo, throttle position sensor and overheating problems. There might be other things as well that will cause it.

elysium · **Posted:** Mon Jul 30, 2007 4:03 pm

This has happened to me but the story is different. I started it up and let it roll as it was idling. I noticed that it was rolling slower than usual but thought nothing of it. Drove it about 300 meters to a stop sign. Just as I was applying the brakes, the whole Jeep started shaking violently. I stopped, turned it off, and started her back up. It does that everytime I notice that it rolls slower than usual so I just let the engine run for about 30 seconds before I take off.

Endurance · **Posted:** Mon Jul 30, 2007 7:23 pm

Its also not idling very smoothly. The alternator seems to run rough, like the bearing is bad. When I sit at a traffic light and the AC kicks in, the engine starts to vibrate/shake a little bit. As soon as I rev it up a little it runs smooth again.

My guess is that its either a bad AC or a bad alternator.

Cowcatcher · **Posted:** Mon Jul 30, 2007 7:33 pm

I am don't know if the CRD fuel pump is mechanical or electric but any other diesel I have been involved in really only needed the alternator to run the starter and accessories since spack is not required for combustion. Certainly the CRD uses microprocessors but they would typically work or not work and if they didn't work it is likely the CRD would not run at all. My guess is that the alternator is not an issue.

Endurance · **Posted:** Mon Jul 30, 2007 8:28 pm

Cowcatcher wrote:

I am don't know if the CRD fuel pump is mechanical or electric but any other diesel I have been involved in really only needed the alternator to run the starter and accessories since spack is not required for combustion. Certainly the CRD uses microprocessors but they would typically work or not work and if they didn't work it is likely the CRD would not run at all. My guess is that the alternator is not an issue.

But why is the alternator making that rattling noise, that sounds like a bad bearing? I talked to one of my buddys and he said that GMC trucks have that problem all the time. The bearing goes bad and then the alternator freezes up which causes the belt to snap.

Cowcatcher · **Posted:** Mon Jul 30, 2007 8:31 pm

That could be Endurance but it would not likely be related to the issue where the CRD seems to run on two cylinders.

MACKJ · **Posted:** Mon Jul 30, 2007 9:06 pm

Endurance wrote:

... why is the alternator making that rattling noise, that sounds like a bad bearing? I talked to one of my buddys and he said that GMC trucks have that problem all the time. The bearing goes bad and then the alternator freezes up which causes the belt to snap.

If your alternator is also making a noise it may be the pulley (which has a one way clutch)and not the bearing.
Try this link for info;
http://www.ausjeepoffroad.com/forum/sho ... hp?t=69372

Endurance · **Posted:** Mon Jul 30, 2007 10:01 pm

Thanks, I am almost 100% sure there is something wrong with the alternator, pulley I guess. The reason I didnt go to the Jeep place yet is because they will probably say that there is nothing wrong with it. I mean you can hear it but its not extremely bad. They could easily say thats normal. Any suggestions?

MACKJ · **Posted:** Mon Jul 30, 2007 11:00 pm

Endurance wrote:

Thanks, I am almost 100% sure there is something wrong with the alternator, pulley I guess. The reason I didnt go to the Jeep place yet is because they will probably say that there is nothing wrong with it. I mean you can hear it but its not extremely bad. They could easily say thats normal. Any suggestions?

I haven't actually experienced this one myself on a vehicle but from what I know about one way or "sprag" clutches (from experience in industry) is that when they start to fail they can sound like a bearing problem...either a clicking sound or a squealing noise. You would also expect to see some jumping or deflection of the drive belt when they get really bad.
You may have to wait for it to get a little worse. DC service people, the world over, seem to be a little deaf. Must be hereditary.
Hope that helps.

Endurance · **Posted:** Mon Jul 30, 2007 11:42 pm

MACKJ wrote:

Endurance wrote:

Thanks, I am almost 100% sure there is something wrong with the alternator, pulley I guess. The reason I didnt go to the Jeep place yet is because they will probably say that there is nothing wrong with it. I mean you can hear it but its not extremely bad. They could easily say thats normal. Any suggestions?

I haven't actually experienced this one myself on a vehicle but from what I know about one way or "sprag" clutches (from experience in industry) is that when they start to fail they can sound like a bearing problem...either a clicking sound or a squealing noise. You would also expect to see some jumping or deflection of the drive belt when they get really bad.
You may have to wait for it to get a little worse. DC service people, the world over, seem to be a little deaf. Must be hereditary.
Hope that helps.

Thats exactly what its doing, its CLICKING and you can see the belt jump from time to time. OUTSTANDING analysis!! :shock:

Now the big question though, will DC Techs see/hear the same thing......... I guess I will have to find out.

cocojo · **Posted:** Tue Jul 31, 2007 11:10 am

My Jeep CRD is at the dealers as we speak. It was towed in and when I called last night to check on it they said they were in contact with people from DC who know CRD'S. This issue must have thrown a code and I also get that flute howling at high speeds. They gave me a jeep compass to drive around in. 1st gear power sucks in the 2.4 compass.
Lets see Tanny problems or Turbo Lag and problems or T converter or EGR valve or air in lines or ball joints problems or blower motors or howling at high speeds or motor shake on two cylinders, any thing else. Can you believe I still like this vehicle? Do you think they will ever cure any of these issues? My patience is wearing thin though.

Cowcatcher · **Posted:** Tue Jul 31, 2007 11:29 am

cocojo wrote:

My Jeep CRD is at the dealers as we speak. It was towed in and when I called last night to check on it they said they were in contact with people from DC who know CRD'S. This issue must have thrown a code and I also get that flute howling at high speeds. They gave me a jeep compass to drive around in. 1st gear power sucks in the 2.4 compass.
Lets see Tanny problems or Turbo Lag and problems or T converter or EGR valve or air in lines or ball joints problems or blower motors or howling at high speeds or motor shake on two cylinders, any thing else. Can you believe I still like this vehicle? Do you think they will ever cure any of these issues? My patience is wearing thin though.

Cocojo,

Mine howls above 50>55 too. It started after I added cross bars to my roof rack. Folks here told me that was what it was but I didn't believe them at first because I had the bars on for months before the howl started....then I realized that I had removed the snow board holders. :wink:

cocojo · **Posted:** Tue Jul 31, 2007 2:08 pm

Every time I hit 60 + the vehicle howls loud to point where it's unbearable. Dealer says nothings wrong. They never find anything and this is getting old & tiring. I think either the wind getting into something or turbo don't know. Vehicles been there two days I will bet they found nothing wrong. Is everyone here having the same problems with dealers finding out what the problems are with the CRD's? They never find anything.

Cowcatcher · **Posted:** Tue Jul 31, 2007 2:34 pm

cocojo wrote:

Every time I hit 60 + the vehicle howls loud to point where it's unbearable. Dealer says nothings wrong. They never find anything and this is getting old & tiring. I think either the wind getting into something or turbo don't know. Vehicles been there two days I will bet they found nothing wrong. Is everyone here having the same problems with dealers finding out what the problems are with the CRD's? They never find anything.

If you search the "general" forum or post there I think you will find "noise" issues related to air leaks around windows and such that were Liberty related not just CRD.

shaking engine!! felt like heavy misfiring

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