Bucking/Surging Epidemic

[Starjammir]

Are they doing the wiring checks?
All sensors that have been replaced tie together in the wiring circuit, you have to look deep into it

I highly suspect the issue is on the (Fuse #8) power feed

Fuse #8 - Power Feed
Evap Vapor Blocking Valve-Evap Can Vent Valve-Evap Can Purge Valve-VCT Sol 1 & 2 and HO2S11 & HO2S12 (Heaters)
So,
the O2 Sensor Heaters and the Evap Vent Valve are on this circuit (12-Volt) Fused Power


Now we move to the VREF Circuit (5-Volt)

MAPT-Fuel Rail Press Sensor - Eng Oil Press - Wastegate Actuator and DPFE

The Tie In:
Signal Return
MAPT-Fuel Rail Press Sensor-Eng Oil Press Sensor-Wastegate Actuator
and
Signal Return:
DPFE-Ex Press Sensor-EGR Temp Sensor-CHT-ECT, and the HO2S12 (Heater)

So, you have 12-Volt power feeding the (Downstream) O2 sensor, and the signal return spliced into the circuit with the DPFE.
So, if a shorted circuit on this Fuse #8 power feed, which the tech already found (Evap Vent Solenoid) (Repair)
then this circuit can back feed into the DPFE.
Pass through the DPFE and into the VREF circuit for the Fuel Rail Pressure Sensor.

I highly suspect that is the issue 12-Volt power is cross feeding into the 5-Volt VREF circuit, that is the possible tie in for all issues and give false reporting of data to shot-gun parts at it.

A Indepth wire check needs to be done and check the Fuse #8 Power Feed and the 5-Volt VREF and all the signal returns for wire integrity way too many parts being thrown at it without a proper wiring diagnostic.
With the information you have provided and the parts that have been replaced thus far, leads me to this (It's in the wiring) and its most likely damage by a mouse.

I have sent this to my buddy at the dealer. I'll keep you posted.

Sponsored

 

[Starjammir]

Are they doing the wiring checks?
All sensors that have been replaced tie together in the wiring circuit, you have to look deep into it

I highly suspect the issue is on the (Fuse #8) power feed

Fuse #8 - Power Feed
Evap Vapor Blocking Valve-Evap Can Vent Valve-Evap Can Purge Valve-VCT Sol 1 & 2 and HO2S11 & HO2S12 (Heaters)
So,
the O2 Sensor Heaters and the Evap Vent Valve are on this circuit (12-Volt) Fused Power


Now we move to the VREF Circuit (5-Volt)

MAPT-Fuel Rail Press Sensor - Eng Oil Press - Wastegate Actuator and DPFE

The Tie In:
Signal Return
MAPT-Fuel Rail Press Sensor-Eng Oil Press Sensor-Wastegate Actuator
and
Signal Return:
DPFE-Ex Press Sensor-EGR Temp Sensor-CHT-ECT, and the HO2S12 (Heater)

So, you have 12-Volt power feeding the (Downstream) O2 sensor, and the signal return spliced into the circuit with the DPFE.
So, if a shorted circuit on this Fuse #8 power feed, which the tech already found (Evap Vent Solenoid) (Repair)
then this circuit can back feed into the DPFE.
Pass through the DPFE and into the VREF circuit for the Fuel Rail Pressure Sensor.

I highly suspect that is the issue 12-Volt power is cross feeding into the 5-Volt VREF circuit, that is the possible tie in for all issues and give false reporting of data to shot-gun parts at it.

A Indepth wire check needs to be done and check the Fuse #8 Power Feed and the 5-Volt VREF and all the signal returns for wire integrity way too many parts being thrown at it without a proper wiring diagnostic.
With the information you have provided and the parts that have been replaced thus far, leads me to this (It's in the wiring) and its most likely damage by a mouse.

Well I just got the call from their head tech. They swapped another o2 sensor from another truck in and it works fine. It's the same sensor I just changed. Not sure if I got a bad sensor or what. We shall see. I asked him to drive it for week and see if it's fixed.

 

[airline tech]

Well I just got the call from their head tech. They swapped another o2 sensor from another truck in and it works fine. It's the same sensor I just changed. Not sure if I got a bad sensor or what. We shall see. I asked him to drive it for week and see if it's fixed.

Hopefully it's a good fix, if not and the issue returns, the wiring harness between the O2 Sensor and the DPFE needs a good inspection as this will make (2x) that the harness has been touched and it provided a good running engine.
Just something to make note of, hopefully it was just a bad from stock sensor.
The good news is - that with it running good now, it would be easier to induce a failure and see & hear the engine stumble while shaking the harness if this is the case and with the (OE) O2 sensor being replaced for (Code #?) regarding power, this makes it even more suspect of a bad wire in the harness.

 

[HotPepperRedRanger]

In the last week Ford replaced EGR cooler and transmission heater/coolant valve in southern california (check engine light came on during 6 hour trip from Sacramento to LA) it took 12 days at Citrus Ford (DO NOT RECCOMEND) to replace those two parts. I picked up the truck when completed and check engine light illuminated within one block of Citrus Ford. I had check engine light on going from southern california back to Northern California “emissions issue”. I went to my local shop (Rom Dupratt Ford) and they replaced DFPE valve. Truck runs great now. Highly recommend Ron Dupratt Ford.

 

[VAMike]

Truck started driving like crap again with low throttle, replaced the DPFE for the second time. Truck instantly drives fine again. ? Much easier this time with the host clamps I put on last time. Used the generic version this time; ford can kiss my bass, raising the price as much as they have on what's clearly a consumable.

 

[chriskm1968]

How long did it take before the other one went out?

 

[VAMike]

How long did it take before the other one went out?

couple of years

 

[Arccra12]

I am stuck a bit. I changed the sensor and it had water in it. Helped for like a day. I am assuming moisture or condensation is getting in somewhere and just problem re occurs. Unless it is something else. Hard kicking downshifts at times, but bigger issue is power loss often shifting between 20 and 40. Watching power distribution the power dropped to nothing and a slight nose dive before recovering and kicking in gear. When hard up shift or down shift no power loss. Also it's not a clutch type power loss and not much of a blip on RPM's.

Took it to dealer but they did not inform me they will need it 2-3 days to inspect and update tcm. 250 to scan and 300 for upgrades. Which pricing even not mentioning when scheduling is fine but the 2-3 days without warning is lame. So I left to reschedule. I want the tcm upgrade but thinking of taking to my normal mechanic and am learning to hate ford especially service. 2-3 days for inspection and tcm upgrade without warning is terrible service.

I changed sensor, changed plugs, had it inspected and scanned. No codes and nothing found yet.
I am running some intake cleaner and inspecting my intake next. Then maybe 02 sensors which usually throw codes if a issue though. The intermittent aspect has me thinking it is temp or condensation related now especially being in Florida.

I was going to change the whole egr valve assembly but think it will be a waste if the moisture keps coming back.

 

[RedlandRanger]

Truck started driving like crap again with low throttle, replaced the DPFE for the second time. Truck instantly drives fine again. ? Much easier this time with the host clamps I put on last time. Used the generic version this time; ford can kiss my bass, raising the price as much as they have on what's clearly a consumable.

Curious how many miles you have on it now? I'm thinking I replaced mine around 40k - I'm approaching 60k now.

 

[VAMike]

Curious how many miles you have on it now? I'm thinking I replaced mine around 40k - I'm approaching 60k now.

44k on it now; I think it has more to do with climate and time than miles, unless maybe a lot of highway miles can get the temps up longer to keep it drier? Once it starts going downhill it doesn't seem possible to bring it back, no matter how long/hot it runs. Would be interesting to know if it's less of an issue in the desert.

 

[RedlandRanger]

44k on it now; I think it has more to do with climate and time than miles, unless maybe a lot of highway miles can get the temps up longer to keep it drier? Once it starts going downhill it doesn't seem possible to bring it back, no matter how long/hot it runs. Would be interesting to know if it's less of an issue in the desert.

Very well could be similar to fuel dilution - if you do a lot of short trips where the engine doesn't get fully up to temp it might not allow the moisture to evaporate.

It is a cheap part, and once replaced is relatively easy to replace so it doesn't really concern me.

 

[VAMike]

It is a cheap part

Cheap as long as you don't buy the sensor at Ford's current $116 MSRP or the assembly at $151! The first one I got was OEM for $12 in 2023. I guess they have to pay for all the warranty repairs somehow.

 

[RangerBill]

Cheap as long as you don't buy the sensor at Ford's current $116 MSRP or the assembly at $151! The first one I got was OEM for $12 in 2023. I guess they have to pay for all the warranty repairs somehow.

RockAuto has it for $19.18. Others have said that it is the same manufacturer as the OEM Ford part. (No hoses are included).
https://www.rockauto.com/en/catalog...sion,egr+pressure+feedback+(dpfe)+sensor,5088

 

[VAMike]

RockAuto has it for $19.18. Others have said that it is the same manufacturer as the OEM Ford part.

Yes, I used the generic this time because ford is price gouging this thing.

 

[TJC]

I buy them 3 at a time. Still have 2 left. When I am down to 1 I'll buy 3 more... shipping is the same from Rock Auto for 3 as it is for 1.

Sponsored