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Old 08-16-2012, 01:00 PM   #1761
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From what some have reported on before and after affects, I am not buying water in the IC. It just doesn't compute. I have to see it to believe it.
I know what you mean, but the Ford TSB does clearly state that humid/misty/rainy conditions can cause the issue. Honestly, when I had the issues and misfires on the 2nd bank of cylinders, I didn't know what the issue could be. But it seems like the Ford TSB is implicating the intercooler as the culprit.
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Old 08-16-2012, 02:07 PM   #1762
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Sounds like they are guessing though. In theory when you consider the immense pressure on the fuel rail @ 2200 PSI, if the injector is held full open, it can quickly overwhelm the cylinder with fuel.

Another thing that goes against water in the IC, no one has hydrolocked an engine. You would think ingesting enough water to cause the engine to falter like this, you would think something would bend or break. Ingest enough water and the engine would seize.

Another possibility is cam timing, the DI engines have a way of having valve overlap, where the exhaust and intakes can be open at the same time for startup in cold weather and emissions. the idea is to get a small charge of unburnt fuel into the exhaust stream and forcing it to the cats to kick off the warming in the first few seconds of engine start. If the computer gets screwed up to the point where fuel is dumped, the cam timing gets wacked, and spark cuts out, well, there you go, an engine doing exactly as described.

Too many variables to deal with that can cause what is happening. Even baffled, the problem still happens, which leads me further into believing water is not the issue.
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Old 08-16-2012, 02:30 PM   #1763
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Quote:
Originally Posted by acdii View Post
Sounds like they are guessing though. In theory when you consider the immense pressure on the fuel rail @ 2200 PSI, if the injector is held full open, it can quickly overwhelm the cylinder with fuel.

Another thing that goes against water in the IC, no one has hydrolocked an engine. You would think ingesting enough water to cause the engine to falter like this, you would think something would bend or break. Ingest enough water and the engine would seize.

Another possibility is cam timing, the DI engines have a way of having valve overlap, where the exhaust and intakes can be open at the same time for startup in cold weather and emissions. the idea is to get a small charge of unburnt fuel into the exhaust stream and forcing it to the cats to kick off the warming in the first few seconds of engine start. If the computer gets screwed up to the point where fuel is dumped, the cam timing gets wacked, and spark cuts out, well, there you go, an engine doing exactly as described.

Too many variables to deal with that can cause what is happening. Even baffled, the problem still happens, which leads me further into believing water is not the issue.
If water is not the issue, then how is it that water was present in my intercooler when it was removed and drained last Feb?
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Old 08-16-2012, 03:57 PM   #1764
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Pics? Like I said, I'll believe it when I see it.
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Old 08-18-2012, 11:54 AM   #1765
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So, as I have stated as well as others, the shudder was non existent in the warm weather the last few months. We are starting the change into Fall here in Mn, where overnight temps are dropping into the upper 40's to mid 50's. Last night I went for a short drive about 10:30 pm. I started the truck and there was a lot of steam from the exhaust. Temp was in the low 50's. Went up a hill at 43 mph, and the miss/shudder was there. The one where you can here the turbo blow off and come in and out of boost. This is the first time it has done it since April. I have had all TSB's done regarding the issue since Spring/Summer. I was just waiting for the cooler weather to return to see it it was fixed, guess not. Gonna have to wait for the highs to be in that range before bringing it back in so I can show it to the dealer. Without a doubt, it is still there, and hasn't been fixed with the TSB's.
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Old 08-18-2012, 08:50 PM   #1766
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Regapped my plugs before installing the SCT tune last night. Called up to the dealership to verify part numbers, gap, and torque spec. Gap is to be .035. Upon pulling my plugs the color looked normal at 12,000 miles. All three on my driver bank were gapped at .034, the passenger bank was all gapped at .033, so not too bad there. I cleaned and regapped to .030 and installed my tune. Can't say that I felt it shudder any, and the tune definately changes the truck! I hear my tubos going to work way more now! Will have to drive in to work one morning with it to see if I can get it to shudder on the usual hill. I'll be sure to report back!
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Old 08-20-2012, 12:18 PM   #1767
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Shot an email over to my salesman regarding the issue and that it is prevalent again with the cooler temps coming back in. Asked him to forward it to service and that for now I will keep an eye on it and try to log as much info as possible as to when it occurs and will keep an eye on anything in my Torque App that may give some insight into what is going on. Its really weird that it only happens at like 55 degrees or less, that is one common condition I have discovered. The next thing I am going to keep an eye on is if maybe the dew point is more of the factor than temp, like maybe up here this time of year when the temp falls to those levels it is really close to the dew point? One thing I think I can cross out as a factor is Winter blend fuel, as we do not have that at pumps yet. I know that was one thing people thought could be a contributing factor.

***Looked up the weather history for Friday evening when it occured again, temp was 54 degrees, dew point was 50 degrees, humidity was 87%, time was 10:30 PM.***

I don't know but I am going to start a log, not only to try and help the dealership but also as backing in Lemon Law should I need to go that route. Its been in twice, with two different TSB's performed...and the issue is still there. Should be able to get the two more required trips needed by the end of the year if thats the route I choose to take. We will see what Ford comes up with.
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Old 08-20-2012, 05:33 PM   #1768
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Everyone should check their gaps on their plugs.
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Old 08-20-2012, 06:45 PM   #1769
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I have a hard time believing Ford couldn't figure that out, it would be a quick easy cheap fix if they had to do it. Just don't think its probable, but I will be checking mine at some point.
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Old 08-21-2012, 06:41 AM   #1770
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At what rpm is this happening at. With different axle ratio's the speed wouldn't be the same.
I have 3.15 axle and haven't experienced it. When I am running 55 I am in sixth gear at about 1200 rpm's.
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Old 08-21-2012, 06:41 AM
 
 
 
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