Engine won't idle until driven
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New User
Joined: Mar 2002
Posts: 9
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From: cockeysville usa
Engine won't idle until driven
So a few weeks back my 98 F150 4.6L threw the excessive flow code (can't remember the exact number). It has 120K. So after an hour or so of searching this forum I found out that it is typically caused by a bad DPFE sensor. So I went ahead and replaced both the EGR and DPFE sensor. My symptoms are better but asymptomatic. Now the thing either runs fine or it won't start unless I give it gas. I say it starts right up and dies instantly about 60% of the time. I have to feather the gas while working the auto tranny to keep the idle up....if not it stalls. I typically do this "dual foot routine" for a few minutes. Basically, I'm power braking the thing to maintain idle while coming from or to a stop. After a few minutes the truck idles just fine by itself. No codes.
Any thoughts?
Any thoughts?
Thread Starter
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New User
Joined: Mar 2002
Posts: 9
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From: cockeysville usa
I've been searching. Thanks for the input will check it out.
Could this be a clogged throttle body? Reading that can also throw the P4101 code. Thing is, my truck isn't throwing any codes.
Could this be a clogged throttle body? Reading that can also throw the P4101 code. Thing is, my truck isn't throwing any codes.
Elder User
Joined: Jun 2005
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you probably did this but check to see that all your vaccum lines are still hooked up, might have accidentally disconnected one. another way to tell is iff you hear a high sucking sound that second or two it's running. I would still verify all lines are still hooked up or even better one of them broke or has a hole in itand needs to be replaced. I know because when i was checking something once I acidenatlly disconnected and acted the same way. I knew because I heard the sucking sound. Hope fully it is that easy. If not then I agree woth 92merc it is probably the IAC valve.
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