Engine shudder
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Junior Member
Joined: Jan 2021
Posts: 6
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Engine shudder
2015 F150 V-6 3.5 eco boost
Situation: Both right bank and left bank catalyst systems show codes for low threshold. Right bank O2 sensors were replaced about six months ago. Note: Likely irrelevant, these codes popped up immediate following a front brake job.
Conditions: Highway speed while under low power demand on an upward grade of any elevation. For instance gently pressing the accelerator to maintain speed or using cruise control.
Symptom: Engine shudders intermittently causing very noticeable and loud, and disturbing, shudder in the vehicle.
Actions taken: Carbon cleaning and plug replacements. No affect.
What do I suspect? Moisture accumulation in the charge air compressor. But why would that happen all of a sudden?
Situation: Both right bank and left bank catalyst systems show codes for low threshold. Right bank O2 sensors were replaced about six months ago. Note: Likely irrelevant, these codes popped up immediate following a front brake job.
Conditions: Highway speed while under low power demand on an upward grade of any elevation. For instance gently pressing the accelerator to maintain speed or using cruise control.
Symptom: Engine shudders intermittently causing very noticeable and loud, and disturbing, shudder in the vehicle.
Actions taken: Carbon cleaning and plug replacements. No affect.
What do I suspect? Moisture accumulation in the charge air compressor. But why would that happen all of a sudden?
5 Year Member
Joined: Dec 2018
Posts: 4,440
Likes: 1,188
From: Ocean Springs MS
You need to read and post the actual DTCs (Diagnostic Trouble Codes) that you have.
I own a 2007 F150 4.6L and it that vintage truck I would suspect a P030x code. Example P0304 indicating a misfire on cylinder 4.
I own a 2007 F150 4.6L and it that vintage truck I would suspect a P030x code. Example P0304 indicating a misfire on cylinder 4.
