Warm up time and holding the gears

[Alacrity]

19-444 is a range switch, it tells the ECU what you want the gearbox to do, i.e. D, 2, L etc. It also acts as an inhibitor switch to only allow starting in P & N & also a rev light switch. It is unlikely to be this issue as I have never heard of a Bongo one giving a problem. There are different types fitted over the years that don't interchange.

(or it brown and smells of burnt toast)

If it smells of burnt toast it is knackered & will need re-manufacturing or changing for another used one (as most seem to do). Don't waste you money on an oil change.

It sounds like a temp sensor issue to me, there are probably more than one on the engine, one will be the guage & there may well be another for the ECU. I don't know for sure though never having had to look for it.

[Northern Bongolow]

18-840c is the coolant temp sensor for the engine, its mounted in the offside middle of the head, it does the fans, glowplugs etc could this also control the gearbox via its ecu.
these tend to fail over time, they break where the plastic end meets the brass end.

http://lushprojects.com/bongopartsmk2/c ... mgno=.html.

it looks like this.

https://www.google.co.uk/search?q=mazda ... CFgUPnM%3A

[rita]

Alacrity,this might be of some help..42 seconds on video , this guy has a lot of useful videos re engines.


https://www.youtube.com/watch?v=xTtxYEb4gCg

[mikeWalsall]

Ummm .... This video does not exist.

[rita]

Ummm .... This video does not exist.

Try again Mike.

[mikeWalsall]

Link works ine now .. many thanks ..

[roosmith]

Thanks for the extra replies people

The oil looks normal and not brown or burnt smelling. I'm going with an oil change this weekend, it needs doing anyway. As I started the thread it does "feel" like a temperature sensor issue.

I'll report back.......................

[roosmith]

As per my other post about it leaking after I carried it out, I have changed the oil in the gearbox, it didn't smell burnt, it wasn't brown (more just darker red than new). The magnet was furred by not overly however the oil change did the job and the Bongo is back to changing up much quicker when cold. Must have been a viscosity issue. (obviously touching wood etc)

[cmm303]

As per my other post about it leaking after I carried it out, I have changed the oil in the gearbox, it didn't smell burnt, it wasn't brown (more just darker red than new). The magnet was furred by not overly however the oil change did the job and the Bongo is back to changing up much quicker when cold. Must have been a viscosity issue. (obviously touching wood etc)

Or maybe a dirty/clogged filter which has more impact while the ATF is cold? (I'm assuming you cleaned the filter when the sump was off)

[roosmith]

I did clean the filter, although it wasn't that dirty, only a couple of flecks of metal came out of it. Obviously it was a slightly lighter colour when I'd finished. It all helps I'm sure, not sure exactly whether it was filter or oil of course.

[cmm303]

I wondered the same, but it is a very fine mesh so reckon that a bit of sludge on it would be barely noticeable but could affect its resistance to cold oil. Also noticed some bright shiny specks come off it Hopefully Alacrity will be along to put us out of our eternal wonderings

[Alacrity]

Can't explain that at all. The gear changes are electrically commanded, so the oil can't, in theory, effect it all. If the oil wasn't burnt & was just discoloured with age then I can't see how it could have been causing an issue. Were it an old hydraulically controlled unit with no electronics then yes, oil changes could make a difference.

A mystery I'm afraid.

[roosmith]

Thanks for the reply, much appreciated. Obviously I'm happy that it appears to work but interested of course why. I know very little of the black art of automatic boxes but remembered seeing one being refurbished and them talking about the small chambers etc - must have been the old type like you say. In my head that theory was applicable to my situation! Little information and all that!

I'll continue to monitor it. In theory my Bongo has only done 90k so hopefully I've got a little while before the refurb transmission is needed (although I do abuse it with towing).

[cmm303]

Thanks for the reply, much appreciated. Obviously I'm happy that it appears to work but interested of course why. I know very little of the black art of automatic boxes but remembered seeing one being refurbished and them talking about the small chambers etc - must have been the old type like you say. In my head that theory was applicable to my situation! Little information and all that!

I'll continue to monitor it. In theory my Bongo has only done 90k so hopefully I've got a little while before the refurb transmission is needed (although I do abuse it with towing).

+1

Mine is nearing 100k miles so may be similar mileage or nearly double km!