[s-cars] loss of power

[Robert Myers]

Some cars have 1 some 2.  My urS6 has two and probably yours does as well 
but I can't make a firm statement on that for you.  I think it varies from 
I-5 to I-5 model year but I haven't researched it to be sure.

I have experienced this KS timing back-off.  It just simply ain't no fun 
'tall.  It feels like the car just died.  It runs and will SLOWLY 
accelerate and will pick up significantly better if you back off a bit and 
relieve the conditions causing knock.  Once it accelerates into higher rpms 
the ECU automatically backs off the boost some and the tendency for 
knocking is reduced and you can accelerate more or less normally.

The stock ECU uses a knock sensor timing map which, when activated by the 
detection of knock, cuts the timing back from quite a bit of advance to 
essentially zero advance.  That is an absolutely horrid thing to experience 
when you are pulling out to pass a slowpoke before oncoming traffic closes 
off your opening.

What causes knocking?  Heat.  Poor fuel.  Too high boost.  Carboned up 
internal parts acting as a source for preignition?  Partially plugged 
intercooler not removing heat rapidly enough (blasted dead 
bugs!)?  Something else?

Is this what's happening to you?  I dunno but it's a halfway decent guess - 
maybe?


At 03:37 PM 6/28/2004 -0400, Elijahallen92 at aol.com wrote:

>In a message dated 6/28/2004 3:32:36 PM Eastern Standard Time, 
>robert at s-cars.org writes:
>
>
>>Knock sensor signalling ECU to cut back advance?  That will absolutely kill
>>power.
>>
>>Different fuel recently?
>
>
>My first thought was fuel but I have tried other fuel and the problem is 
>the same. I have never had an issue with a knock sensor. How many are 
>there and where are they located? If it is a knock sensor why does it only 
>happen when I go WOT at or below 3000 rpms? Thanks,
>
>Elijah

_____

If you're not outraged you're not paying attention.


Bob
*****
  Robert L. Myers 304-574-2372
  Rt. 4, Box 57, Fayetteville, WV 25840 USA WV tag Q SHIP
  '95 urS6 Cashmere Grey - der Wunderwagen ICQ 22170244
  http://www.cob-net.org/church/pvcob.htm
*****