Transmission rev 3rd to 4th 2008 awd edge

[Jsenske]

I know there are other topics on here about this which I have read a lot of. I haven't found a lot of causes reported once fixed. While shifted from 3 to 4 it revs like in neutral. It does it slightly in another gear to. It did not start doing it gradually just all of the sudden. Seems like a valve body issue or solenoid. Can the OSS and TSS cause this. Continuing to drive will definitely harm transmission. The fluid is clean and smells normal. Hooked a snapon modus up there is no code my TPS seems fine. This looks like one of the very common problems could somebody please help me on what fixed their 2008 edge awd

[Brucifer]

2007 and not AWD, but mine was having the same issue. Did a flush and flash and it's 98% better. Can't say 100% because I might be looking for any sort of hiccup and from Park to Reverse can be harsh at times. Flush can be done at your trusted shop, but the flash is dealer only. Mine was roughly a Benjamin for each. Took a couple of hundred miles for everything to even out.

 

How many miles are on it? I didn't have any codes on mine, either.

[Jsenske]

82000. It just started doing it. Doesn't matter if it's hot or cold. My uncle owns a shop so I can Flush it. It does it the same every time. Really seams like something is delayed like something in the valve body

[Jsenske]

Anyone else who has fixed their problem like mine? I'd greatly appreciate what you problems and fixes for 2008s

[WWWPerfA_ZN0W]

Trans flush is a good idea (or at least a 3x drain & fill). Next thing is to make sure you are running the appropriate weight motor oil (5W20 or 0W20, synblend or full synthetic). Motorcraft oil filter works fine (FL400s), no need for expensive aftermarket filters. Good fuel from a high turnover station helps too. Run Techron or BG 44K through the fuel tank.

 

Next on my list would be spark plug & PCV valve change.

 

Sensorwise, sure, the OSS/TSS sensors or the TR sensor could be acting up. Again, a fluid xchange might help the trans clear out any unwanted particles interfering with the sensor operation. Try unhooking the neg battery cable for 30 min, then reconnecting, and going through the PCM relearn process.

 

There are TSBs for 5th gear starts from stop, for example, but nothing IIRC specifically for 3rd-4th shift & the like.

[Jsenske]

I had it hooked to a modis scanner. It is starting to misfire on #1 cylinder but very slightly still run smooth and pulls 34 mpg the misfire is so slight it shouldn't be an issue to transmission.How would these issues make the trans seem like it goes into neutral briefly before picking up 4th. Just wondering in the tss or oss could cause this or if engine issue actually could. It's not like the engine cuts out it actually revs just like you push in the clutch Then 4th hits. No slipping

[WWWPerfA_ZN0W]

34 mpg? with AWD? Wow, I want THAT!!! The reason I suggested looking at the engine first/resetting the PCM was because I too thought the trans was a culprit for similar symptoms on my Edge. But that was not the case. There are/were no codes set either.

[Jsenske]

Sorry 23-24 sorry typed wrong. 34 would be great but a dream. What were you symptoms that your engine problems caused specifically. I'm not saying it can be just wierd cause trans is actually going into like a false neutral momentarily. I'm not going to say it can't be anything, I'll check all the other stuff. What do I need for pcv valve. I had already pulled the neg lead on battery with no affects

[WWWPerfA_ZN0W]

Symptoms will be the engine will rev up with no forward movement/perceived lack of additional power demanded. For example, I am cruising along at 40 mph on flat road, 1,100 rpms or so, come up to a hill and press on the accelerator to maintain speed going uphill. Normally, the engine will rev up to 2,500 rpm and give me additional power to maintain speed. But if these symptoms occur, I will have to press further in, get the rpms up to 3,000-3,500 rpm to get the Edge to maintain speed. If I accelerate hard, the engine will rev happily, right up to 6,000 rpm without any resulting forward movement. I will have to back off the throttle a bit, let the gearshift (downshift) occur, then back into the throttle to get the result I want.

 

I am primarily concerned about the engine oil due to its' potential effect on the cam phasers, and hence timing of the engine's ignition cycle.

 

The PCV valve you need is the non-electrically heated one found here:

MOTORCRAFT EV257 {#2X4E6A666AA, 2X4Z6A666AA}
w/o Elec Heated PCV

 

Motorcraft SP411 for the plugs work just fine.

MOTORCRAFT SP411 {#AYFS22FM, AYFS22FMF4} Finewire Platinum
Gap: .054

[Brucifer]

PCV can be done without removing the intake manifold, but it's not fun. At 82k, you are on the short side of plug replacement, but in for a penny, in for a pound....

 

Don't forget the intake manifold gaskets if you go that route. Watch the videos.

[Jsenske]

Ok will do these maintenance issues to prevent these problems. One sounds a little different. I have no lack of power. That part is good for now. Just the trans not actually picking up the next gear right away after it drops 3rd

[Jsenske]

Found some more info from transmission specialist. Sounds like may be 2/4 clutch and shaft. Must be common. I'll keep posted

[Jsenske]

Does somebody have a repair manual off that could send me

[WWWPerfA_ZN0W]

You can get one off EBay (DVD/CD format) fairly cheap.

[Jsenske]

Thanks I bought a pdf version for $10. Just to make it easy to pull trans. Book for trans will come with parts. Got bad luck. When my uncle told trans specialist the symptoms he knew what was wrong right away and they have parts in stock. Hope this fixes all Thanks for all the help so far if anyone has any other ideas I'd appreciate it

[WWWPerfA_ZN0W]

I sure hope the problem is as diagnosed. Depending on how much experience the specialist has with this particular trans, you know? It is quite rare for the trans to suffer actual mechanical issues prior to the 150K mark, unless it has been in the "severe duty cycle" for part or most of its' life and the fluid has not been changed accordingly.

[Jsenske]

I guess very knowledgable all he does is trans. He said a seal starts to leak by shaft somewhere then it overheats the clutch packs for 2-4. There is a wave plate that then loses its spring and that's the cause. I guess it takes a while for final problem to appear. Once we told him the issues he immediately said this was the problem and had parts to fix it. I dunno hope hes right a lot of work for nothing otherwise. When it shift 3rd to forth it goes into like a false nuetral for a second or 2 then catches good no slip. Just wanna be done with it honestly

[Brucifer]

Are we digging deep into the guts of the tranny? Is it a removal or in place? If it's not too nosey, cost? I have the books, but too lazy to read through the procedure (they are in the garage at the moment).

[Jsenske]

It's on the trans bench now ready to come apart. I believe $800 with new torque converter rebuild kit and the parts that supposedly caused this mess. Fluid coming out was extremely clean no burnt smell. I may not have to rebuild just fix what went wrong. Only 82000 on it. But it isn't the easiest thing to pull so maybe I'll just do it all. Just depend how good of shape it is. Took me 5 hours to pull trans I imagine guys that do it all the time and know what to do can really do it fast. This was my first time. Going back in will be a lot better. I will post what we find so it might benefit others maybe some pictures. Anybody who has been in one any words of advice would be great

[WWWPerfA_ZN0W]

Good luck, Jsenske, I have no idea how much work it is to rebuild a modern trans (other than there are a LOT of electronics in there now), and I hope it goes perfect 4 you.

[Jsenske]

Thanks. I also see how good of an idea it is to change ptu fluid regularly. I just changed mine a couple times but could not get it clean. Actually had gunk on suction tube I used to drain. Fluid really breaks down these things must overheat. So since I had it off I decided to pull apart to give it a good cleaning. I caught it just in time. I have to replace a couple bearings and it is not perfect but is ok. It made no noises before and was smooth but very close to complete failure. I should get a while out of it now. Only 82000 miles. I know there is many other posts about this that I haven't read. There is not much fluid in them. I will now change mine yearly at a minimum. Hopefully all goes well my uncle is helping me who knows what he's doing. I'll post what I find in trans

[WWWPerfA_ZN0W]

I am glad that you are able to tackle these types of projects yourself, and in doing so, encourage others to DIY more often Do you have any pics of the PTU internals from your Edge?

[Jsenske]

I can't pay people for what I can do. Plus my uncle has a full auto shop that helps. I will get some pictures. I may just replace whole ptu they aren't cheap but peace of mind. I'll try getting some pics tonight. Trans should be coming apart tomorrow

[Jsenske]

Found a bad diode in the transmission. It's a one way deal so one part can spin a way it shouldn't. Other then the clutches that were a part of this the trans is in excellent condition. Hopefully this is my only problems. I didn't have time to get pictures but I'll try tomorrow

[WWWPerfA_ZN0W]

Is this a mechanical diode such as the one this article talks about:

http://meansindustries.com/products/mechanicalDiode.aspx