[V8] 5sp VS Auto 3.6 ECU differences?

[Tony and Lillie]

I suspect you are talking about Jack's new 5-speed, which needs guide seals unless Dave H did them. I know when I drove the car (shortly before he sold it) it needed them. When I followed him, it smoked both on extended idle and while decelerating. If that's not the car, then onto this:

Yes, Auto cars shut off fuel while decelerating, I believe down to 1400 RPM. No, it really doesn't make sense that it smokes with the auto ECU and not the 5-speed. The kearning curve for the ECU is very short, on the order of warmup plus about 30 seconds. Either way, what was the reasoning for swapping in the auto ecu?

Tony



-----Original Message-----
>Subject: Re: [V8] 5sp VS Auto 3.6 ECU differences?
>
>Comments inserted....
>
>--- On Mon, 3/15/10, urq <urq at pacbell.net> wrote:
>
>> From: urq <urq at pacbell.net>
>> Subject: Re: [V8] 5sp VS Auto 3.6 ECU differences?
>> To: v8 at audifans.com
>> Date: Monday, March 15, 2010, 11:09 AM
>> As far as I can tell only the
>> EPROM.  IME on smoke on decel it doesn't
>> happen all the time.  Did the person who did the test
>> swap the 5-speed back
>> in and see the smoke?  
>
>He said he got no smoke with the 5sp ECU.
>
>>There is one possible
>> difference, it is something
>> I've asked but don't remember hearing a response ... does
>> fuel get
>> completely shut off on an AT car on overrun?  You can
>> tell by the trip
>> computer instantaneous fuel economy going to "----".
>
>
> All so, it's my understanding in such a setup (4.2 5sp with 3.6 stuff with bigger inj) that the ECU will have to learn what's going on now with the motor.... so the Auto ECU might have to learn longer than a 5sp ECU would?
>
> Ron
>
>> -----Original Message-----
>> From: v8-bounces at audifans.com
>> [mailto:v8-bounces at audifans.com]
>> On Behalf Of
>> Ron Wainwright
>> Sent: Monday, March 15, 2010 6:35 AM
>> To: v8 at audifans.com
>> Subject: [V8] 5sp VS Auto 3.6 ECU differences?
>> 
>> Is there any differences "internally"?
>> 
>> It has come to my attention that the 3.6 Auto ECU doesn't
>> cut the fuel off
>> like the 5sp ECU... 
>> ... It was told to me that in his 4.2 original 5sp car with
>> 3.6 ECU and
>> wiring that with the Auto ECU on deceleration he got smoke
>> out the rear
>> pipes..... but when he put the 5sp ECU in it didn't smoke
>> on
>> deceleration....does that make sense?
>> 
>>  Ron
>> 91 V8 5sp mit 4.2 aka Black Betty (hibernating)
>> 91 20020vt 22psi
>> 
>> 
>>       
>> 
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>
>
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