[Vwdiesel] *help! smoking & bucking*

[Rolf Pechukas]

THANKS, James
interspersed:

On Mar 25, 2010, at 2:38 PM, James Hansen wrote:

> Rolf Rolf Rolf....
> You have some kind of mechanical failure field machine you been working on?
> 
> TURN IT OFF NOW, it's working.
> 
>> - engine light is NOT on
> 
> Does it come on when you turn the key to run, with engine not running?  IE:
> is the bulb burned out?

engine light works, turns on w/ key, goes off after a sec or two
(can't say the same for the ABS and the &%$#*@!!! wiper fluid sensors)

>> 
>> thoughts:
>> 
>> - CPU clearly not driving the fuel pump properly
>> 
>> Q's:
>> 
>> - is it possible driving while running the battery down damaged the
>> fuel pump CPU??
> 
> No, faiure mode is generally like a switch. Working, or not working.
> 
>> - or even the fuel pump itself?
> 
> unlikely
> 
>> 
>> - shop charged up the battery before doing the alt
>> if they had reverse-connected the charger, could it have fried the CPU?
> 
> Not with the key off.
> 
>> 
>> - would the car run at all if the CPU were fried?
> 
> Unlikely
> 
>> 
>> - might pump timing need to be re-set? isn't that all CPU-driven?
> 
> May have lost the adaptation.

ah
what is 'adaptation'?
how could it be 'lost'?
possible to 'jump a tooth'? (new timing belt last year)

> Timing is still mechanical.  It is tweaked by the ecu, but has to be real
> ballpark to work well.
> 
>> 
>> - what else could explain this behavior?
> 
> MAF mass airflow sensor.
> Unplug it, and try to drive.

don't know where that is

also, I forgot to mention, my arm is in a sling from a snowboarding accident/recent surgery
I only have 5 clumsy left fingers to work with

(mechanical failure field machine working REAL good)

> That's about the most delicate thing there.  It's a resistance heating
> element- dropping voltage messes with it, MAY have killed it.  Don't suppose
> you have your  copy of VCDS along?

still do not own VCDS
enjoying letting other people do my car work lately
except for today

> I would be tempted to reboot.  Disconnect battery ground from battery for a
> couple minutes, then reconnect.  Run vcds, scan for engine faults, copy,
> save, and clear them.  Then run the engine, and see what comes back.
> Good luck bud.
> -james

thanks James!
I will dig into the MAF and timing pronto