2006 5.4l rough start
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2006 5.4l rough start
Have a 2006 F350 5.4l that is mainly used as a plow truck. I drive it at least once a week when not plowing just to make sure it runs ok, etc. only put on about 2,500 miles per year.
Keep it in good repair - not by me, but by the dealer or mechanics.
Problem - last two times I started it, it started ok but runs real rough for about ten seconds. Sounds like the engine is going to die. After about ten seconds, it "catches" and runs normal. Have no problems when driving it. If I restart it, it doesn't do this, so it seems to only happen when the engine is cold.
Battery was brand new back in Sept. All plugs were replaced maybe 3 years ago, as was the cat converter and muffler. Run non-ethanol fuel.
Just curious if anyone might have a thought as to what might be causing it before I bring it in.
Thanks.
Keep it in good repair - not by me, but by the dealer or mechanics.
Problem - last two times I started it, it started ok but runs real rough for about ten seconds. Sounds like the engine is going to die. After about ten seconds, it "catches" and runs normal. Have no problems when driving it. If I restart it, it doesn't do this, so it seems to only happen when the engine is cold.
Battery was brand new back in Sept. All plugs were replaced maybe 3 years ago, as was the cat converter and muffler. Run non-ethanol fuel.
Just curious if anyone might have a thought as to what might be causing it before I bring it in.
Thanks.
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Did that year have the 3 valve 5.4L? How many miles do you have on it and what kind of oil have you used in this thing? I had similar symptoms in my 99 F250 5.4L and come to find out, a bunch of the lash adjusters were locked up.
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Joined: Sep 2000
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From: Stephensville WI
A 2006 is a 3v engine.
Keep in mind my recommendations are just guesses. Without proper testing you're just stabbing in the dark.
I guess I would start by looking at the cold starting and idle fuel pressure. Maybe the fuel pump is not working well when cold?
Otherwise, I'd also look at the intake air temp sensor (if there is one?), and maybe clean the MAF sensor just for good measure.
Otherwise, get a scanner that can look at real time sensor outputs. You'll need it to pinpoint the issue.
Keep in mind my recommendations are just guesses. Without proper testing you're just stabbing in the dark.
I guess I would start by looking at the cold starting and idle fuel pressure. Maybe the fuel pump is not working well when cold?
Otherwise, I'd also look at the intake air temp sensor (if there is one?), and maybe clean the MAF sensor just for good measure.
Otherwise, get a scanner that can look at real time sensor outputs. You'll need it to pinpoint the issue.
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Thanks for the replies. I actually cleaned the mass air flow sensor last year.
Only have about 64,000 miles on it. It's a secondary truck, so it doesn't get much use except for during the winter for plowing.
As it so happens, I went out today to video the problem so that the mechanic would see it when I brought it in, but it started up fine. The first time it happened was about two weeks ago, and it was about 35 degrees out. The second (and last time) it happened, it was about 8 degrees. Today, when it started fine, it was about 15 degrees. So....the outside temp doesn't seem to be the cause.
I'll just wait and see if it happens again before taking it in to a mechanic.
Only have about 64,000 miles on it. It's a secondary truck, so it doesn't get much use except for during the winter for plowing.
As it so happens, I went out today to video the problem so that the mechanic would see it when I brought it in, but it started up fine. The first time it happened was about two weeks ago, and it was about 35 degrees out. The second (and last time) it happened, it was about 8 degrees. Today, when it started fine, it was about 15 degrees. So....the outside temp doesn't seem to be the cause.
I'll just wait and see if it happens again before taking it in to a mechanic.
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From: Isanti, MN
Fuel pressure was my first thought, your fuel pump might be getting weak.
Second thought was to clean out your throttle body. These engines don't use an IAC valve, so the airflow at idle is controlled by moving the throttle plate. If that's sticking you may be starved for air. What happens when you hit the throttle when it's running rough?
And lastly, you really should scan the PCM for codes. Some codes may not set the CEL, but there's a decent chance the PCM sees something wrong that you aren't seeing.
Second thought was to clean out your throttle body. These engines don't use an IAC valve, so the airflow at idle is controlled by moving the throttle plate. If that's sticking you may be starved for air. What happens when you hit the throttle when it's running rough?
And lastly, you really should scan the PCM for codes. Some codes may not set the CEL, but there's a decent chance the PCM sees something wrong that you aren't seeing.
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Logistics Pro
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Fuel pressure was my first thought, your fuel pump might be getting weak.
Second thought was to clean out your throttle body. These engines don't use an IAC valve, so the airflow at idle is controlled by moving the throttle plate. If that's sticking you may be starved for air. What happens when you hit the throttle when it's running rough?
And lastly, you really should scan the PCM for codes. Some codes may not set the CEL, but there's a decent chance the PCM sees something wrong that you aren't seeing.
Second thought was to clean out your throttle body. These engines don't use an IAC valve, so the airflow at idle is controlled by moving the throttle plate. If that's sticking you may be starved for air. What happens when you hit the throttle when it's running rough?
And lastly, you really should scan the PCM for codes. Some codes may not set the CEL, but there's a decent chance the PCM sees something wrong that you aren't seeing.
The two times that it happened, I didn't get a chance to press the throttle because it cleared itself up within about ten seconds. The first time, I was just leaning into the truck to start it because I was going to clear the snow off of it. The second time I started it with the remote starter and it cleared up by the time I got in the truck. I'll have someone read the codes for me.
Thanks.
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