Bucking/Surging Epidemic

[kieefer]

Maybe one of our clever technicians on here can point this out on our trucks and explain why it/yours connects moisture?

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[Tim Vogt Sr.]

I'll have to remember this and bring it up when I bring my truck in for an oil change on Friday. Mine has been doing this for quite a few months. And like you, it's been getting worse over time. Hopefully mine doesn't sit with them for weeks or anything.

I raised heck with them and they finally got the truck in this morning. A couple of hours later the problem is identified and part ordered. We should have been here 2 weeks ago. In fairness, the dealership is short-handed like we all are and struggling to keep up.

 

[Ranger33566]

Fixed! Just got back from the dealership after being asked to come in and test drive my Ranger. Smooth! Problem was multiple cylinder miss-fires that were not throwing codes but showed up for the tech. The culprit part temporarily swapped from another truck to try is called a Differential Pressure Feedback Valve which had moisture in it.

Thanks OP for taking your valuable time to share the problem and fix which will definitely help some of us on this forum.
Do you happen to know the part number for the DPFE sensor which the dealer replaced?

Maybe it is KA1Z5L200A, but I 'm not so sure.

Many thanks again.

 

[Tim Vogt Sr.]

Thanks OP for taking your valuable time to share the problem and fix which will definitely help some of us on this forum.
Do you happen to know the part number for the DPFE sensor which the dealer replaced?

Maybe it is KA1Z5L200A, but I 'm not so sure.

Many thanks again.

No part number, sorry.

 

[Gerder]

Fixed! Just got back from the dealership after being asked to come in and test drive my Ranger. Smooth! Problem was multiple cylinder miss-fires that were not throwing codes but showed up for the tech. The culprit part temporarily swapped from another truck to try is called a Differential Pressure Feedback Valve which had moisture in it.

thats what I ment when i said kick ass that thing from time to time ??

 

[Opusnbill7]

No part number, sorry.

Once its fixed, see if they put the part number on the invoice/repair receipt. They typically do here, but dealers can be different...

 

[Tim Vogt Sr.]

Once its fixed, see if they put the part number on the invoice/repair receipt. They typically do here, but dealers can be different...

Just picked up the truck. Part number listed as LB5Z9J433B
https://parts.lakelandford.com/p/Fo...HAUST-GAS-RECIRCULAT/91072122/LB5Z9J433B.html

"all cylinders have history of random misfire"

 

[kieefer]

Just picked up the truck. Part number listed as LB5Z9J433B
https://parts.lakelandford.com/p/Fo...HAUST-GAS-RECIRCULAT/91072122/LB5Z9J433B.html

"all cylinders have history of random misfire"

I thought they told you it was the Differential Pressure Feedback Valve??
I think it’s a $16 part.

 

[Tim Vogt Sr.]

I thought they told you it was the Differential Pressure Feedback Valve??
I think it’s a $16 part.

Looking at the diagram in the link I provided, it looks like they replaced an assembly. I assume the DPFE is part of this assembly. The service manager told me it is part of the EGR system.

The work order states "faulty DPFE" The other day when I test drove the truck I wrote down exactly what the service manager said: "Differential Pressure Feedback Valve, DPFV"

In Ranger33566's post above, I think he identifies the part, but I got the whole assembly in the diagram he posted.

 

[Mercfh]

Will cylinder misfire damage the engine? I mean I guess did/could it have caused damage?

 

[Willis]

Got my truck looked at today and I believe they are going to replace the same part also. They said it will take 2 to 3 hours.

 

[Deleted member 1634]

I'll have to remember this and bring it up when I bring my truck in for an oil change on Friday. Mine has been doing this for quite a few months. And like you, it's been getting worse over time. Hopefully mine doesn't sit with them for weeks or anything.

As an update to try and close the loop here:
I took mine in this morning for this issue. The technician apparently had no trouble discovering the issue on his drives since they didn't have any further questions for me.
They came out of the back with some burnt spark plugs from my truck, where exhaust had been leaking around them and toasting and staining them. Those have been replaced, and on the short drive to work afterwards it seemed to be running and acting better. A few longer drives will tell the true tale, but I'm hoping I'm done with this. At least until after the next 2 years and 50k miles they start burning out again. haha

 

[Larry]

For what it's worth here's my efforts to resolve the issue on my '19 Ranger with 48K mainly hiqhway miles. 1) CRC GDI cleaner- minimal improvement in bucking syndrome. 2) Replace plugs-minimal improvement. 3)Switch to 93 Octane- mild improvement. 4) Clear Trans adaptive learning with FORscan lite and OBDLink Mx+- no noticeable improvement. 5) Dealer re-program PCM- some improvement. Powertrain warranty covered TSB 20-2339

Waiting a few more days for adaptive learning to settle. Will follow up.

Purchased KA1Z5L200A sensor, since it was such an inexpensive part ($15)referred to in a couple of posts. Will replace when I get around to it just for grins, not really holding out hope that this little part is responsible for the issue.

 

[Larry]

Follow up: Replaced sensor and that seems to have significantly reduced if not eliminated the bucking at low RPM I was experiencing. Go figure? It was a relatively easy process and the sensor is fairly easy to get to. I used a dremel to cut away the hose clamps on the sensor and replaced with regular adjustable hose clamps. The spring type hose clamps on the other end of both hoses where they hook up to metal tubing are easily compressed with a pair of needle nose pliers. Took me about 30 mins.

For under $20 in parts cost, may be worth giving it a try if you're experiencing the low rpm bucking syndrome.

L

 

[doug910]

Glad I found this thread because I'm experiencing similar issues. Same symptoms as OP, where the truck starts bucking/surging if the engine is at ~1500 rpm with about 5% throttle. It goes away as soon as I put it into sport mode to downshift the trans or step on the gas. I had assumed it was bad transmission calibration where it tried to lock the torque converter too early because it really does feel like a manual trans car that's too high of a gear. Then again, I'm at 42k miles, and I really only started to notice it in the past few months. Misfires and spark plugs weren't even on my radar, planning to drop it off at the dealer soon, will report back if I get similar results.

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