Diagnosis Help Needed Fast
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Lead Driver
Joined: Jul 2005
Posts: 5,967
Likes: 7
From: Eccles, WV
Diagnosis Help Needed Fast
I am now chasing a new problem. Symptons are as follows:
Truck idles fine.
When driving, at certain running speeds say around 1700 rpm, the truck surges. It is like the injectors is turning on and off. Then it will stumble. It will also do that when the cruise is on while traveling a flat road. It will speed up (surge) and then slow down (stumble).
I am thinking of one of two things. Either the fuel pump or that damn CPS.
I just changed all filters and oil as it was due. Actually changing the oil seems to have made it worst. But it also may be my imagination.
Any ideas?
I am going on a trip next Wednesday and I need to get this fixed as soon as possible. I am going to have it scanned for codes and will post what the codes say in a few hours.
Truck idles fine.
When driving, at certain running speeds say around 1700 rpm, the truck surges. It is like the injectors is turning on and off. Then it will stumble. It will also do that when the cruise is on while traveling a flat road. It will speed up (surge) and then slow down (stumble).
I am thinking of one of two things. Either the fuel pump or that damn CPS.
I just changed all filters and oil as it was due. Actually changing the oil seems to have made it worst. But it also may be my imagination.
Any ideas?
I am going on a trip next Wednesday and I need to get this fixed as soon as possible. I am going to have it scanned for codes and will post what the codes say in a few hours.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Injection pressure regulator controls the oil pressure in the heads which fires the injectors. If the IPR is opening and closing a little while driving it can make the engine surge or fall off since the injectors use this oil to fire.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
Nope, thats the ICP. IPR is on the back of the HPOP.
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i ain't rite
Joined: Mar 2005
Posts: 65,449
Likes: 5,518
From: Marlboro Mental Hospital.
Paul, have you ever changed the oil in your high pressure oil pump??
over time, it gets as thick as molasses in there.
over time, it gets as thick as molasses in there.
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i ain't rite
Joined: Mar 2005
Posts: 65,449
Likes: 5,518
From: Marlboro Mental Hospital.
in theory, yes. in actuality, no.
i have not done the 02 for the second time yet, because it is still a little cold, and i can't get it into the garage.
but as soon as it warms up i am going to do it again.
a ford tech told me every third oil change is good, but it was real crappy when i did it when i first got the truck, so i want to do it again before i go to the every 3 oil change period.
i have not done the 02 for the second time yet, because it is still a little cold, and i can't get it into the garage.
but as soon as it warms up i am going to do it again.
a ford tech told me every third oil change is good, but it was real crappy when i did it when i first got the truck, so i want to do it again before i go to the every 3 oil change period.
Post Fiend
Joined: Feb 2002
Posts: 10,600
Likes: 3
From: Carhenge
in theory, yes. in actuality, no.
i have not done the 02 for the second time yet, because it is still a little cold, and i can't get it into the garage.
but as soon as it warms up i am going to do it again.
a ford tech told me every third oil change is good, but it was real crappy when i did it when i first got the truck, so i want to do it again before i go to the every 3 oil change period.
i have not done the 02 for the second time yet, because it is still a little cold, and i can't get it into the garage.
but as soon as it warms up i am going to do it again.
a ford tech told me every third oil change is good, but it was real crappy when i did it when i first got the truck, so i want to do it again before i go to the every 3 oil change period.
I'll shut up now.
i ain't rite
Joined: Mar 2005
Posts: 65,449
Likes: 5,518
From: Marlboro Mental Hospital.
and i agree that an hpop oil change probably will not fix it, but it can't hurt to try, rite??
