random rough idle
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Senior User
Joined: Dec 2008
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random rough idle
I have an 04 350. Ford just put a new reman in right at a 1000 mi ago, tech said everything was new, except the turbo and exauhst manifold. The other day i noticed a slight "hiccup" while idleing almost like its missin on one cylinder. When i took off, i didnt notice it while drivin and it didnt happen again till today. I did notice it up to about 1250 rpm this time, just a real small miss. Should be under warrenty, but dont feel like puttin the cat back in.lol Where should i start? I have a computer i can hook up, but what tests should i run. Thanks
Tuned
Joined: Mar 2007
Posts: 365
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From: Alberta, Canada
There are a few options on this one, but the most likely is oil level.
I've found on both 6.0s I've owned that when they were filled right to the top of the stick they would do exactly what you are describing, when I filled them 1/2 way up the stick my idle problems went away. The logic behind this is that the pan is right full there is a tendency for the oil to froth a bit and this aeration can cause erratic idle. 1/2 way up the stick is actually the recommended level (see this article)
Another possibility is a problem with either the ICP sensor or the IPR valve. Unlikely on the new engine but not impossible.
Good luck, the intermittent rough idle can be a really frustrating symptom to diagnose.
I've found on both 6.0s I've owned that when they were filled right to the top of the stick they would do exactly what you are describing, when I filled them 1/2 way up the stick my idle problems went away. The logic behind this is that the pan is right full there is a tendency for the oil to froth a bit and this aeration can cause erratic idle. 1/2 way up the stick is actually the recommended level (see this article)
Another possibility is a problem with either the ICP sensor or the IPR valve. Unlikely on the new engine but not impossible.
Good luck, the intermittent rough idle can be a really frustrating symptom to diagnose.
New User
Joined: Dec 2008
Posts: 11
Likes: 0
There are a few options on this one, but the most likely is oil level.
I've found on both 6.0s I've owned that when they were filled right to the top of the stick they would do exactly what you are describing, when I filled them 1/2 way up the stick my idle problems went away. The logic behind this is that the pan is right full there is a tendency for the oil to froth a bit and this aeration can cause erratic idle. 1/2 way up the stick is actually the recommended level (see this article)
Another possibility is a problem with either the ICP sensor or the IPR valve. Unlikely on the new engine but not impossible.
Good luck, the intermittent rough idle can be a really frustrating symptom to diagnose.
I've found on both 6.0s I've owned that when they were filled right to the top of the stick they would do exactly what you are describing, when I filled them 1/2 way up the stick my idle problems went away. The logic behind this is that the pan is right full there is a tendency for the oil to froth a bit and this aeration can cause erratic idle. 1/2 way up the stick is actually the recommended level (see this article)
Another possibility is a problem with either the ICP sensor or the IPR valve. Unlikely on the new engine but not impossible.
Good luck, the intermittent rough idle can be a really frustrating symptom to diagnose.
Elder User
Joined: Jun 2008
Posts: 724
Likes: 2
From: Sarasota, fl
Keep the factory filters ( Motorcraft ), keep the factory air filter also ( unless you do heavy mods ), and go with synthetic oil.
Resident smarta$$
Joined: Aug 2006
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From: Oaks,PA
New User
Joined: Dec 2008
Posts: 11
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Yeah I know...But Im not going to thorw away something I paid $900 for and it works fine for me. But how about you trade me for your SCT??
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Resident smarta$$
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From: Oaks,PA
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Resident smarta$$
Joined: Aug 2006
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From: Oaks,PA
He could probably sell it on ebay and still have enough to buy some sweet custom tunes, and the truck WILL thank you for it. I got mine used from a member here for $310 shipped and it was the best $310 I ever spent!
I can't wait until spring gets here, I want to try the ASE tune!
I can't wait until spring gets here, I want to try the ASE tune!
New User
Joined: Dec 2008
Posts: 11
Likes: 0
He could probably sell it on ebay and still have enough to buy some sweet custom tunes, and the truck WILL thank you for it. I got mine used from a member here for $310 shipped and it was the best $310 I ever spent! I can't wait until spring gets here, I want to try the ASE tune!
I can't wait until spring gets here, I want to try the ASE tune!
Resident smarta$$
Joined: Aug 2006
Posts: 4,929
Likes: 9
From: Oaks,PA
SCT with custom tunes also programs your trans which others claim to do. Do a search on these things and make some popcorn, there's lots to read. I'm not trying to flame you or anything, but there are lots of guys here that have had other tuners and it cost them in the long run. There are also guys that have the other brands and claim to have had no problems. The SCT is the choice for the 6.0 for alot of good reasons.
Elder User
Joined: Jun 2008
Posts: 724
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From: Sarasota, fl
You don't know how bad is your other brand tuner, until you drive the same truck with the SCT.
New User
Joined: Dec 2008
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I have 70K miles on my truck right now and blown head gasket is EXACTLY what I'm worried about
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