'87CSTQW Engine under load cuts out momentarily.

[BSWANN@arinc.com]

Greetings,

I had posted a question awhile back re. the afterrun circuit on my 
'87CSTQWagon, and now have another.  I hadn't had time to get back as 
I have been going through the wonderful experience of my wife having a 
baby girl.

To recap. on the afterrun circuit, as it turns out I never had a 
problem.  I had finally taken a good cruise around town on a warm 80+ 
degree day to the local AUDI dealer to buy the switch I was reluctant 
to buy.  When I got back, lo and behold - the circuit kicked in and 
fan and pump were running/cycling.  I guess this upholds my theory 
that even when the engine appears to reach normal operating 
temperature and the fan is kicking on, there isn't always enough 
latent heat in the block to get the head temp. to rise enough to make 
the afterrun kick on.  I replaced the switch anyway, since you can't 
return electrical parts - it made no difference.

Onto the next question.  When I'm accelerating and hit 1.5 on the 
barometer, the car bucks as if the ignition or fuel pump is shutting 
out momentarily.  This is rather aggravating and seems almost 
dangerous especially when passing.  The engine kicks back in when 
boost drops to 1.4 and is insistant to not accelerate so hard - to me 
it seems that the car is just getting into its power band. This 
happens more as a load condition, not RPM related, although problem is 
usually noted 3300 RPM on up. The engine has around 137Kmi. Is this 
the waste gate opening up?  Does the wastegate circuit cut the 
ignition or fuel pump too?  I've been following related posts, but I'd 
appreciate finding out if this is normal for my stock vehicle in good 
tune with vacuem hoses in good condition.  Also, what are the steps to 
rectify this in order of dificulty and expense - eg, cut particular 
wire to fuel pump relay causing cutout, re-chip, install stronger 
wastgates spring, etc?

I have obtained a set of Bentley manuals for reference, but appreciate 
other owners experences and BTDT.

TIA for your replys(direct replys appreciated, as I get the digest).

Ben Swann
'85 4ksq
'86 5kcstq (rebuilding)
'87 5kcstq Wagon