Strange Stumble
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Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
Strange Stumble
2002 F250 5.4L 64k miles.
I changed my fuel filter a couple of weeks ago, and before that it has only had a miss once before. Now, as it did then, it only last a few seconds. However now, it seems as though any time I travel at a constant speed for 5+ minutes, when I come to a stop the motor shakes and is has a slight hesitation. I have put 300 miles on after the fuel filter, so I don't think there is air traped in it.
I haven't check for codes tonight, but the last two times it did this no codes. Motor's clean, fresh oil, new trans fluid.
I changed my fuel filter a couple of weeks ago, and before that it has only had a miss once before. Now, as it did then, it only last a few seconds. However now, it seems as though any time I travel at a constant speed for 5+ minutes, when I come to a stop the motor shakes and is has a slight hesitation. I have put 300 miles on after the fuel filter, so I don't think there is air traped in it.
I haven't check for codes tonight, but the last two times it did this no codes. Motor's clean, fresh oil, new trans fluid.
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Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
I had thought that, but the rpms don't drop much after I have come to a complete stop. However, the first time it happened, it continued to shake while driving. I drove a hundred yards and it stopped.
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Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Not a trans issue. It did it again today at 40mph, decel felt ok, but accel was shakey until around 2300 rpm. I got a place and dropped it neutral, idle to midrange hesitated, 3K+ was smooth and crisp.
While under power my a/f gauge was erratic, normally it bounces lean to rich, but when it was missing the LEDs bounced atleast twice as fast. I haven't been back out to pull any codes yet, I'll check it alittle later.
It didn't clear up on it's own, so I pulled into arbies and got lunch. Came back out the truck fired up and idled/ran smoothly the rest of the way home. It's becoming more frequent so maybe I'll know what is wrong.
While under power my a/f gauge was erratic, normally it bounces lean to rich, but when it was missing the LEDs bounced atleast twice as fast. I haven't been back out to pull any codes yet, I'll check it alittle later.
It didn't clear up on it's own, so I pulled into arbies and got lunch. Came back out the truck fired up and idled/ran smoothly the rest of the way home. It's becoming more frequent so maybe I'll know what is wrong.
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Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
Ok, No DTC's. However, I am looking back over an autotap log I made after the seafoam went through the top end. I think I have an electrical problem. Battery voltage is shown to go from 14.1 to 0 and IAT goes from -44 to 66 *F and so does the ECT. It's cool out side but not below 60. It drops instantly, so It might be a glitch in the software, but it's still somewhat trouble some. Any ideas?
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