Re: [DML] automatic transmission?

[Marc Levy <malevy_nj@xxxxxxxxx>]

Which controller did you buy??

Assuming you still have the original DeLorean shift controller (or a rebuilt one...  NOT one of the "new designs")

Put the test light setup on the AT test port, and test drive.  See if the light go on/of as expected.  If they do, then the electronics are OK.

There are 5 large "banana" connectors at the port, the center one is "common" and the 2 on either side are for when 2'nd and 3'rd kick in.  Hook some low wattage (or LED) lights to it.  In 1st both lights are on, 2nd one light is on, 3rd both lights are off.  Most people run a wire through the window or door in to the car so they can watch it while driving.

So, if you decelerate and all of the lights stay off then the electronics are keeping it in 3rd gear.  

If the lights come on but the trans stays in 3rd, then the problem is mechanical.

If you have an original "computer" (rebuilt?) then I suspect the problem may be mechanical because (except for the kick-down switch), the "computer" has no idea if your are increasing or decreasing speed.  It simply looks at how fast your going at this exact instant and puts the trans in the appropriate gear.  (Yes, I know this is a simplified version of what it does, but for this discussion it applies!)

Of course, if you have one of the newer "microprocessor based" shift computers, then none of this may apply because I have no idea if they work the same way.  I suspect the "light test" would still work.


--- On Sun, 5/2/10, Cameron, Peter <cameron@xxxxxxx> wrote:

> From: Cameron, Peter <cameron@xxxxxxx>
> Subject: [DML] automatic transmission?
> To: dmcnews@xxxxxxxxxxxxxxx
> Date: Sunday, May 2, 2010, 11:38 AM
> I'm getting a noise from the
> Timachne, a new noise, that has me worried. I've been
> driving it regularly since the snow went away, but just
> local stuff around home. I drove it work on Friday, ~25
> miles each way. On the way home, and near home, I had to
> slow down for a car making a turn. There was an odd sort of
> vibrating sound that seemed to come from the back of the
> car, and the engine stalled. I restarted, continue on. Same
> thing happened when I slowed down to make the turn towards
> home. Same thing happens every time I slow down, not at
> first, just as one gets fairly slow. I can feel vibration in
> the auto trans shift lever when this happens, almost like
> squealing but not so high pitch. If I put it in neutral
> before slowing down the sound/vibration seems less and the
> engine doesn't stall. If I leave it in gear it is more
> likely to stall. My immediate sense is that it is something
> to do with the transmission computer, or perhaps that
> something in the transmission is binding as it tries to
> downshift to lower gears. It is fine on acceleration,
> upshifts fine, doesn't seem to be any slippage, no funny
> sounds,...
>  
> The shift computer was recently professionally replaced,
> and I've only put a couple thousand miles on since then, so
> perhaps it is less likely that is the problem. I checked
> trans fluid, looks clean, pristine, and the level is
> correct. No indications of overheating. Nothing seems to be
> getting unusually warm.
>  
> Any suggestions?
>  
> Don't want to drive it any more until this is understood,
> for fear of doing damage.
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
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