Mk6 ASM slowly loosing pressure (or something else ?)

[faltime]

Hi Guys and thanks for your help.

I got an ex australian post transit with a "lovely" ASM gearbox.
When I open the door, the pump bzzz normally and the van drives all right.

But: If I stop with engine idle for 5 minutes, or if I have a long drive on the highway and then go to stop, the van will stumble at start (the release of the clutch is not smooth at all). Then if I open the door, hpu will buzz, and everything is back to normal.

It feels like the system is loosing pressure.
I have no warning light on the dashboard.

Any Idea what it could be ?
Is there a mechanic pump as well or only the electric one ?

Thanks

[Altransit]

Welcome to the forum

You'll need to do a search on here using "ASM gearbox" or variants of these words, there are quite a few threads with ASM problems, but not all have been successfully resolved. The threads may give you some clues as to what needs checking. There are certainly relays and switches which can give intermittent problems, notably a grey relay situated somewhere near the engine bay fuse box. which can play up

There is very little first hand knowledge of these boxes in the UK, and most of the knowledge has been posted here by Australian members ('Samwhich' was a member who posted quite a lot of info)

search.php?author_id=76022&sr=posts

[samwhich]

Hi all, sorry have been offline for a while and not staying up to date with this site.

Mine has been having similar issues lately very randomly and intermittently. Usually when taking off first thing in the morning (but not every morning) and a couple of times randomly while the engine is warm after a good drive with no issues. Most of the time, it is fine so I ignore the issue however it doesn't sound good when it is happening. It goes something like this:

1. Start Van
2. Foot on brake and select "D". (Engine continues to idle fine)
3. As soon as you barely even touch the accelerator, the clutch engages before the revs have a chance to get up and the van stalls.

When this occurs, I actually have to rev the engine in neutral with foot on brake pedal and then press "D" button so there are sufficient revs to take off and then it works. After that, the van will drive fine.

A friend of mine (young guy - ex Ford Mechanic) took it for a drive and believes the clutch seems fine (not slipping at all), HPU seems fine as it changes gear 99.9% of the time without issues so it could be that the TCM module might need to be "relearned". As I did drive around with a damaged gearbox for a while before getting a new 2nd hand one installed, this may have upset the TCM module giving this solution some credibility. Have not tried yet though so cant say.

Low cost things to try:

1. Have Ford do a TCM "relearn" for you
2. Have your ASM transmission "bled" (which is something you should do at least once a year apparently as this removes air bubbles from the trans fluid resulting in better/smoother shifting of gears

Please let me know if you have found a solution as I have not tried the above two things yet.

Cheers guys

[ossie cossie]

i have just got home i will try my ASM in the morning and write down my simptoms and see what i can find out.

[Frag]

Hi all, sorry have been offline for a while and not staying up to date with this site.

Mine has been having similar issues lately very randomly and intermittently. Usually when taking off first thing in the morning (but not every morning) and a couple of times randomly while the engine is warm after a good drive with no issues. Most of the time, it is fine so I ignore the issue however it doesn't sound good when it is happening. It goes something like this:

1. Start Van
2. Foot on brake and select "D". (Engine continues to idle fine)
3. As soon as you barely even touch the accelerator, the clutch engages before the revs have a chance to get up and the van stalls.

When this occurs, I actually have to rev the engine in neutral with foot on brake pedal and then press "D" button so there are sufficient revs to take off and then it works. After that, the van will drive fine.

A friend of mine (young guy - ex Ford Mechanic) took it for a drive and believes the clutch seems fine (not slipping at all), HPU seems fine as it changes gear 99.9% of the time without issues so it could be that the TCM module might need to be "relearned". As I did drive around with a damaged gearbox for a while before getting a new 2nd hand one installed, this may have upset the TCM module giving this solution some credibility. Have not tried yet though so cant say.

Low cost things to try:

1. Have Ford do a TCM "relearn" for you
2. Have your ASM transmission "bled" (which is something you should do at least once a year apparently as this removes air bubbles from the trans fluid resulting in better/smoother shifting of gears

Please let me know if you have found a solution as I have not tried the above two things yet.

Cheers guys

Sounds like either the DMF has free play / movement which is confusing the system as to where 'biting point' is,
Or it needs the clutch learn routine to determine said biting point.

[samwhich]

Thanks for your suggestions Frag!

What is the "DMF"? Have not heard of that one yet...

The fact that it is only intermittent and temperature irrelevant, would you still say a relearn could be the solution? And if so, do you know if the TCM "relearn" can be achieved through the master ECU reset process? (With ignition on "I" and headlights on full beam, disconnect the positive terminal from battery and earth it out for 10 seconds....etc etc) [Source for this process was from some other ford related forum/topic found during a quick google search but was confirmed accurate on "most ford models"]

Cheers

[Altransit]

What is the "DMF"? Have not heard of that one yet...

DMF = Dual Mass Flywheel

[duddles]

Does that reset ecu did that work mines stuck in gear pita