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        General >> Problems >> 24v autobox problem
        
(Message started by: Tenfut on Dec 19^th, 2019, 9:19pm)

Title: 24v autobox problem
Post by Tenfut on Dec 19^th, 2019, 9:19pm

Autobox seems to be randomly selecting neutral when in "D" position. This first happened after driving through torrential rain and flooded roads. It only stays in neutral for about three seconds and then thumps back into normal drive. Are there any electrical connectors under the car that could have become wet and would benefit from a clean. I have cleaned the MAF and fitted a new air filter. When selecting drive or reverse it takes 2 seconds (timed) and most of the time drives and changes gear as it should. Also the fluid seems OK with no smell of burning or any nasty bits showing on the dipstick. Is this likely to be an electrical fault or impending autobox failure?

Any and all suggestions much appreciated.

Tony

Title: Re: 24v autobox problem
Post by Tompion on Dec 19^th, 2019, 9:52pm

Given that it happened "after driving through torrential rain and flooded roads" it's quite likely to be loom damage. The connections are on the passenger side of the box but disturbing them is likely to damage the loom more (if that is the problem). You may not be able to unplug them without lowering the box a bit. Spraying the loom with some sort of protection might help but as it runs along the top of the box you can only really do it near the plugs on the box & where the wires come from the block connector C112 mounted on the drivers wing down the side of the engine.

Dave

Title: Re: 24v autobox problem
Post by Tenfut on Dec 19^th, 2019, 9:56pm

Thanks Dave

What would you suggest spraying them with?

Tony

Title: Re: 24v autobox problem
Post by Tompion on Dec 19^th, 2019, 10:57pm

Corrosion block sometimes helps, you used to get it from aircraft supply firms but more available now such as here on Ebay:
https://www.ebay.co.uk/itm/263293111736

You could try WD40

You normally get the OD light flashing if electrical. If you're not getting that you could try adjusting the gear selector linkage.

Title: Re: 24v autobox problem
Post by Tenfut on Dec 19^th, 2019, 11:01pm

No O/D flashing.

"Adjust the gear selector linkage"

Could you expand on that ie method / how much adjustment.etc

Sorry to be a pain but this is all new territory to me

Title: Re: 24v autobox problem
Post by Tompion on Dec 20^th, 2019, 12:10am

To be honest I doubt that's the problem the PDF "Selector Rod Adjust" can be found here:
http://www.fordscorpio.co.uk/autotrans.htm

You can get a fair idea of whether the adjustment is right by with the engine running slowly moving the selector into D from N then do the same from 2 to D & judging whether the point of engagement each side is about the same relative to the sticks natural position in D.

Title: Re: 24v autobox problem
Post by Tenfut on Dec 20^th, 2019, 11:43am

Thanks again Dave

I have ordered some of that corrosion block you recommended. Have you used it yourself?

Tony

Title: Re: 24v autobox problem
Post by Tompion on Dec 20^th, 2019, 4:30pm

I used it on my engine bay loom, it helped for a few weeks but I had to rewire in the end.
Someone on the mailing list used to soak his engine bay loom every couple of months, I think it kept it going for a year or so before scrapping it.

Whether or not it works rather depends on what's happening in the loom (assuming that's the problem), if the insulation is so bad it's shorting then not much hope, if the wires are cracked allowing the signal wires to track when wet it may stop that.

Mine was so bad after going through floods I wouldn't have trusted it once I'd crept home with it. I was lucky, I found the finis number on the loom did a search & found a brand new one on Ebay.

There is someone selling a refurbished 2.0l one if you want to get an idea of what it looks like:
https://www.ebay.co.uk/itm/252846764513

Not sure what the difference is - perhaps the cossie has both the post cat sensors running through it instead of just the one with the 4 cylinders.

Title: Re: 24v autobox problem
Post by brds on Dec 20^th, 2019, 5:25pm

I did one of these for my 2.0L, details are in the HOW TO section.
It looks like he's done a good job and from my experience, it's worth the price.
If you decide to change, I'd recommend buzzing it out pin for pin to compare with your old Cossie one.

Title: Re: 24v autobox problem
Post by Tompion on Dec 20^th, 2019, 6:13pm

Tony,

If it is loom damage I was forgetting it could be the engine bay loom, in another thread I posted:
"Both times I've had flashing OD light it was wiring. First time it happened it was after going through a puddle & was the autobox loom which I changed. A couple of years later when it happened it was the engine bay loom - hope that's not your problem."

However you didn't have flashing OD light....

Dave

Title: Re: 24v autobox problem
Post by Tenfut on Dec 23^rd, 2019, 4:21pm

Dave

Do you think opening up the square black box under the p/s reservoir and spraying with electrical contact cleaner may be of benefit or am I opening a can of worms?

Tony

PS I see someone else has a similar problem to mine but he has the flashing O/D light.

Title: Re: 24v autobox problem
Post by Tompion on Dec 23^rd, 2019, 4:55pm

I don't think it will hurt, sometimes just separating them to move the contacts helps - try not to flex the wires too much & blow out any muck that falls in. Make sure the seal stays in place in the lower half.
Doesn't the 24v have 2 plugs there like the 2.3? The black plug is the engine & brown the autobox.

Title: Re: 24v autobox problem
Post by a900one on Jan 5^th, 2020, 12:20pm

The 24v has 2 plugs, I have had them apart and sprayed them, as I think thats where my problem is, going ok at the moment.
Gerald.

Title: Re: 24v autobox problem
Post by Tenfut on Jan 5^th, 2020, 6:22pm

Hi Gerald

Are they easy to take apart? Anything to watch out for?

I am suffering from the dreaded winter lurgy at the moment so could be a few days before any car doctoring carried out.

Tony

Title: Re: 24v autobox problem
Post by a900one on Jan 5^th, 2020, 11:01pm

Hi Tony
They are easy to get apart, the back plug has to be off to get the front one apart. I sprayed SOS spray on the pins and put them back, they are held together by a bolt which pulls them apart as well, I tried to move them as little as I could so as not to damage the wires. There is a grease for them, which I used last time, but I did not use it this time. Get well soon.