5.4 stumble, bad egr or DPFE?
#1
5.4 stumble, bad egr or DPFE?
I'm trying to fix a stumble/hesitation issue at 12-1500rpm with my 98 expedition 5.4.
I tested my dpfe and the top wire was around 1.40v or so with NO vacuum applied to the hose. One I added suction, it stopped at 4.94v.
So according to the ''test dpfe'' thread my sensor is bad, but would it cause my stumble? I've also read that a weak diapham spring in the egr could cause this. I have no codes stored in the pcm.
After running the truck with the DPFE unplugged for a couple days, the truck ran great, no stumbles and seemed to have more power in general.
So today I grabbed a dpfe from the j yard hoping to get lucky. Installed it and still had the same problem.
Tested it and this sensor was reading 1.0v with no vacuum.
Thoughts?
I tested my dpfe and the top wire was around 1.40v or so with NO vacuum applied to the hose. One I added suction, it stopped at 4.94v.
So according to the ''test dpfe'' thread my sensor is bad, but would it cause my stumble? I've also read that a weak diapham spring in the egr could cause this. I have no codes stored in the pcm.
After running the truck with the DPFE unplugged for a couple days, the truck ran great, no stumbles and seemed to have more power in general.
So today I grabbed a dpfe from the j yard hoping to get lucky. Installed it and still had the same problem.
Tested it and this sensor was reading 1.0v with no vacuum.
Thoughts?
#2
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Will do. If the passages are clear then most likely the egr valve is bad correct?
#7
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I had a terrible stumbling problem with my 97 Expy with the 4.6L. I did everything you mentioned and more. It turned out the upstream passenger side 0@ sensor went bad due to a manufacturing flaw. The condensation drain for the A/C empties onto it. After i replace the )2 Sensor and did the recommended solution which was a piece of hard plastic vacuum line to divert the condensation away from the sensor all of good and the stubble went away. There were day when it got so bad I thought it might die at the light. Hope that helps, since I did the whole EGR thing, pulled the throttle body and cleaned the ports, I even replaced the vapor canister and solenoid ont he gas tank. I literally went from front to back and 2 years later found out that Ford had this issue and they had a service bulletin out on it.
I'm trying to fix a stumble/hesitation issue at 12-1500rpm with my 98 expedition 5.4.
I tested my dpfe and the top wire was around 1.40v or so with NO vacuum applied to the hose. One I added suction, it stopped at 4.94v.
So according to the ''test dpfe'' thread my sensor is bad, but would it cause my stumble? I've also read that a weak diapham spring in the egr could cause this. I have no codes stored in the pcm.
After running the truck with the DPFE unplugged for a couple days, the truck ran great, no stumbles and seemed to have more power in general.
So today I grabbed a dpfe from the j yard hoping to get lucky. Installed it and still had the same problem.
Tested it and this sensor was reading 1.0v with no vacuum.
Thoughts?
I tested my dpfe and the top wire was around 1.40v or so with NO vacuum applied to the hose. One I added suction, it stopped at 4.94v.
So according to the ''test dpfe'' thread my sensor is bad, but would it cause my stumble? I've also read that a weak diapham spring in the egr could cause this. I have no codes stored in the pcm.
After running the truck with the DPFE unplugged for a couple days, the truck ran great, no stumbles and seemed to have more power in general.
So today I grabbed a dpfe from the j yard hoping to get lucky. Installed it and still had the same problem.
Tested it and this sensor was reading 1.0v with no vacuum.
Thoughts?