Re: How to tell when overdrive engages on 87 Aerostar
> Sure. Let me to take the opportunity to publicly thank Backyard
> Mechanic for all his help. You're one of the bricks, if not _the_
> brick of this newsgroup and there are a _lot_ of ford owners who've
> benefited from your knowledge and willingness to help.
> Shifting from OD to D while moving at 60 mph doesn't seem to produce
> any noticeable difference in engine RPMs or speed. Once the car is
> wamed up, it idles O.K. Starting up on cold mornings, it displays some
> oscillation characteristics but nothing that hasn't been there in the
> past few winters. Once it gets warmed up it sounds pretty much like it
> always does.
> I still haven't had any tangiable confirmation that 4th is kicking in.
> I haven't had a chance to do the long straight level acceleration. My
> impressions are, so far, I feel the changes up to 3rd then, when I'm
> letting off the gas to maintain the 55 or 60 I choose to cruise at,
> normally I'd feel that slight engagement of the clutch converter (this
> is an A4LD transmission) and I don't think I'm getting that. I say
> "don't think" because sometimes that engagement could be pretty subtle.
> Now I don't know if it's happening at all.
With this transmission, letting off the throttle or any quick TIP in or
TIP out actually disengages the converter clutch. Tapping the brake
pedal will too, even w/ steady pressure on the accelerator pedal.
Reading through the posts it isn't clear - do you have a tach?
You should actually be able to detect 4 "shifts" including TC lockup on
normal, straight line level acceleration. When cold, the TC will not
lock up until a specified engine temp is reached - I think around 90-110
degrees recalling from memory. To confirm your "gear" status, a tach
would be the best tool.
> I don't suppose there are any ways to use the OBD to tell what's
> happening with the transmission?
Not w/ EEC IV.