Mid range stumble/miss
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Junior User
Joined: Jun 2005
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Mid range stumble/miss
My 2005 F350 6.0 basically runs great, except; when going down the road the truck accelerates fine until about mid range and then sort of stumbles like a miss. Give it a little throttle and it goes away. Doesn't happen out on the highway at high speeds. Seems to only happen on the slower roads and just before the tork converter locks up. I had the truck scanned and they said #3 injector looked a little week. I replace that with absolutly no change. Again the truck runs smooth on the highway and gets me 19-20 mpg hand calculated. Also, the injector harness was just replaced and the FICM tests at 48v starting and running. Any ideas?
tks
David
tks
David
Elder User
Joined: Feb 2009
Posts: 649
Likes: 2
From: PA
I had a bit of a stumble in mine while accelerating and it ended up being the IPR valve.
It took a while to figure out what it was, EGR was deleted, and I thought it might be injectors, but I posted on here:
https://www.ford-trucks.com/forums/1...ors-maybe.html
and Bismic suggested it might be the IPR valve.
I picked an IPR valve up for $173 from my local international dealership and that fixed it. My international guys help me out alot and are really good guys. they will cross reference anything for me.
It took a while to figure out what it was, EGR was deleted, and I thought it might be injectors, but I posted on here:
https://www.ford-trucks.com/forums/1...ors-maybe.html
and Bismic suggested it might be the IPR valve.
I picked an IPR valve up for $173 from my local international dealership and that fixed it. My international guys help me out alot and are really good guys. they will cross reference anything for me.
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Junior User
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Getting Worse
The stumble and then run great is now a definate miss. Its not throwing any codes so I had it scanned again. They now say cyl 1 & 7 are low but think the main problem is the FICM. There readings were 47 to 48volts but he said they were moving back and forth erratically and probably worse under load. Does this all sound right? I thought 47-48volt was an ok value but I don't know about the bouncing back and forth.
FICM, IPR, Injectors, which one first??
FICM, IPR, Injectors, which one first??
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Junior User
Joined: Jun 2005
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Truck starts and idles ok, start going down the road and is ok up to about 15mph then start to miss. The mis is now pretty constant but does sometime fade away. Its not throwing any codes or blowing any smoke.
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Junior User
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When I got out on the highway and got speed up to 60-65mph truck ram fine, there may have been a slight miss but overall smooth. Then get off highway and drop to 30mph and the rumble sstumble is back. The miss goes away at idle. Could the FICM be dropping voltage at mid range?
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