surging/pulsating

kjjet · **Posted:** Tue Dec 31, 2013 3:23 pm

Keep Knocking!

Brianawd · **Joined:** Wed Apr 03, 2013 12:59 pm **Posts:** 130

So today jeep started running really bad right as I get to work. No check engine light but I wanted to check any way.
this time I get
P0100
P0101
P0301

So now I have some place to start.

papaindigo · **Posted:** Thu Jan 02, 2014 12:29 pm

For those 1st 2, which may have indirectly cause the 3rd, try unplugging the MAF sensor and being sure the contacts are clean then replug making sure it's seated and the locking tab is engaged. Also the wires can be sensitive to internal breaking. Also check the cleanliness of your air filter.

GreenDieselEngineering · **Joined:** Sun Jun 07, 2009 5:10 pm **Posts:** 1111

Brianawd wrote:

So today jeep started running really bad right as I get to work. No check engine light but I wanted to check any way.
this time I get
P0100
P0101
P0301

So now I have some place to start.

P0101 can be flagged with work rocker arms. P0301 #1 cylinder misfire, could be an injector leak, but doubtful. This can also happen if a rocker arm is broken. Not good news, but salvageable.

CATCRD · **Posted:** Thu Jan 02, 2014 11:14 pm

Yep sounds like some rockers collapsed if it was that sudden.

Brianawd · **Joined:** Wed Apr 03, 2013 12:59 pm **Posts:** 130

Well after work, started the POS up and guess what. The miss was gone that it had this morning and it was running fine. I'm going to order all the timing belt parts along with rockers and lifters in the next few weeks.When everything is apart, I'm going to have the injectors tested also. Because I'm a retard I will most likely fix the issue and keep the jeep as a back up rig/week ski slut. I hate the thing, but love it at the same time. :banghead:

diesel_guy86 · **Posted:** Fri Jan 03, 2014 1:17 am

My crd used to do the same thing, then on my way to sc this summer it acted up and I had to limp it to a hotel, in the mountains. Anyways checked fuel filter blah blah. Ended up being the injector harness plug on the #3 cylinder. Found it by unplugging an injector one at a time. Once I found it I wiggled it and pushed it on real good and no problems since. Since you had your injectors out its possible. I'd almost lay money on it thats what it is.

Brianawd · **Joined:** Wed Apr 03, 2013 12:59 pm **Posts:** 130

diesel_guy86 wrote:

My crd used to do the same thing, then on my way to sc this summer it acted up and I had to limp it to a hotel, in the mountains. Anyways checked fuel filter blah blah. Ended up being the injector harness plug on the #3 cylinder. Found it by unplugging an injector one at a time. Once I found it I wiggled it and pushed it on real good and no problems since. Since you had your injectors out its possible. I'd almost lay money on it thats what it is.

I would love if that was the issue. But this same issue has been going on for about 9 months now. Its comes and goes. I have unplugged and plugged my injectors 10 times making sure its not a connection issue. Fact I is, I have check every plug on this motor.

Lifters and rocks along with testing the injectors is next.

Brianawd · **Joined:** Wed Apr 03, 2013 12:59 pm **Posts:** 130

So have not had much time to figure out this issue. But today I hooked up my scanner and was watching the live feed as I drove to work. What I noticed is the rail pressure would jump around when the jeep was doing its surging. The jump was a good 3000-4000psi at times and the pressure was never really that study. Once the surging went away the rail pressure was nice and smooth with it only going up and down maybe a few hundred psi. I also noticed for the first time my MAF is dead. I am getting no reading from it at all. Funny because its not throwing any codes.

I want to rip the top end apart and do the timing belt and rockers but I want this issue fixed first. I don't like tossing parts at a car. I want to know what fixes the issue.

geordi · **Posted:** Thu Jan 16, 2014 1:23 pm

Could be the rail pressure sensor then - If it is sending garbage information to the computer (and your scanner) then the computer would be reacting improperly to that information.

IIRC, the rail sensor on the side is cheaper than the one on the end of the rail - The sensor on the end of the rail also cannot be removed without replacing it, it is a one-time-use design. I would try replacing the one on the side first, see if that smooths anything out. As for the MAF, bad data from that (even if your scanner isn't reading anything) could also be annoying the computer. Try to check the individual wires for continuity on that plug, and the plug of the "Mercedes logo sensor" on the side of the airbox. Both of those have a tendency to break internally, causing all manner of strange behavior.

I don't think you have broken rockers. Broken rockers cause poor running, but that wouldn't come-and-go. It would be all the time. You have an electrical issue.

Brianawd · **Joined:** Wed Apr 03, 2013 12:59 pm **Posts:** 130

geordi wrote:

Could be the rail pressure sensor then - If it is sending garbage information to the computer (and your scanner) then the computer would be reacting improperly to that information.

IIRC, the rail sensor on the side is cheaper than the one on the end of the rail - The sensor on the end of the rail also cannot be removed without replacing it, it is a one-time-use design. I would try replacing the one on the side first, see if that smooths anything out. As for the MAF, bad data from that (even if your scanner isn't reading anything) could also be annoying the computer. Try to check the individual wires for continuity on that plug, and the plug of the "Mercedes logo sensor" on the side of the airbox. Both of those have a tendency to break internally, causing all manner of strange behavior.

I don't think you have broken rockers. Broken rockers cause poor running, but that wouldn't come-and-go. It would be all the time. You have an electrical issue.

electrical issue is what I have been thinking. Just tracking it down has been a pain in the a s s.

As for the maf. What function does it have other then being tied into the egr. From my understanding it had nothing to do with fuel metering. all the fuel maps are based off the Map sensor out put.

I know on my Evo the maf is used for idle and low load fuel maps. Then switches to the map when in to the high load cells. Just trying to figure out the system.

Brianawd · **Joined:** Wed Apr 03, 2013 12:59 pm **Posts:** 130

So when it's surging at idle, rail pressure will jump between 2500psi all the way to 8000psi when driving, I watched it jump from 10,000psi all the way to 18,000psi with no change in throttle position. Rail psi is all over the place. Once the surging goes away the idle rail pressure is between 4,800psi and 5,000psi.
Just driving down the road I get I nice smooth linear curve when giving it throttle and nice a rock solid rail pressure when cruising. Now I just need to figure out how to test the different parts of the pressure system

Does any one by chance have any extra Flow Quantity Control Valve that installs into high pressure pump,the Pressure Control Solenoid Valve that installs in the fuel rail along with the Rail Pressure Sensor. Looking to borrow them just to pin point what is bad on my. I would
Pay shipping both ways and send extra money for case of beer.

I want to be able to them one at a time to see what one
Is bad. That way I'm not buying new ones just tossing parts at it.

kjjet · **Posted:** Fri Jan 17, 2014 9:35 am

Brianawd wrote:

I also noticed for the first time my MAF is dead. I am getting no reading from it at all. Funny because its not throwing any codes.

I want to rip the top end apart and do the timing belt and rockers but I want this issue fixed first. I don't like tossing parts at a car. I want to know what fixes the issue.

Did you try installing a new MAP? You can install a Bosch 0 281 002 845 MAP for under $20 but you have to get one from GM. Dealer or online.

Since your problem is intermittent, i can't see it being rockers. Dose it do it with the Heat/ air in the OFF position? My thoughts are:
1. EGR sticking open?
2. FCV?
3. Air in fuel?
4. Sticking injector?

Good luck
KJJET

Brianawd · **Joined:** Wed Apr 03, 2013 12:59 pm **Posts:** 130

kjjet wrote:

Brianawd wrote:

I also noticed for the first time my MAF is dead. I am getting no reading from it at all. Funny because its not throwing any codes.

I want to rip the top end apart and do the timing belt and rockers but I want this issue fixed first. I don't like tossing parts at a car. I want to know what fixes the issue.

Did you try installing a new MAP? You can install a Bosch 0 281 002 845 MAP for under $20 but you have to get one from GM. Dealer or online.

Since your problem is intermittent, i can't see it being rockers. Dose it do it with the Heat/ air in the OFF position? My thoughts are:
1. EGR sticking open- EGR is blocked
2. FCV-Plate has been pulled
3. Air in fuel-check double and triple checked and no air
4. Sticking injector-Could be?

KJJET

Did some searching last night and found a bunch of threads on the cummins forums talking about a surging issue and rail pressure that is all over the place. Seems to be the Flow control actuator on the cr3 pump can cause that. Now just trying to find out if the FCA on the cummins cp3 pump is the same as the one on our cp3 pump. The one for the jeep is $214.61 and the one for a 03-07 5.9 cummins with a cp3 pump is $146.09. Have found it for as low as $90

geordi · **Posted:** Sat Jan 18, 2014 12:23 am

From what I understand, the CP3 is much the same in each application. Your local bosch shop may have a much better answer for you, and they might even have the part at a better price. Worth a phone call!

surging/pulsating

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