[V8] V8Q Transmission Shifting Issue

urq urq at pacbell.net
Sun Oct 19 23:07:13 PDT 2008

I don't have a lot of BTDT with the automatics, but since you just dropped a
new engine in I'd suspect there's some sort of flaky connection which is
causing the problem.  The TCU gets information from the TPS (I'm pretty sure
it does) ... could there be a connection which has been missed?  Do all the
lights on the PRNDL display light up?  Have you tried reading and clearing
codes from the TCU?  

There are some troubleshooting flow charts in the service manual ... you may
want to refer to them to help get to the bottom of the problem.  

Good luck!
Steve Buchholz
San José, CA (USA)

-----Original Message-----

I just had another engine put into my 1990 and now the transmission that
worked flawless before is now having issues.  Here are the symptoms:
-It's acting kind of like it's in limp mode but the display isn't lit up
like a 'normal' limp mode.
-When first starting out, the shift to 2nd is very noticeable.
-It will shift into 3rd fine, I don't think it ever shifts into 4th.
-It won't downshift, even from a dead stop.  If I want to start out in 1st,
I have to turn the car off and start it up again.
-The gear shift position does seem to do anything in regard to the forward
-The Manual, Sport, Economy selector doesn't work (it used to).

Is my TCU fried?

I just figured I'd get some input for when I take it back to my mechanic
friend (he's a retired Audi mechanic but He appears to be a little stumped).

Bellevue, WA

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