1999 S70 AWD surging under load karlaKat

rrres · Post by **rrres** » 11 Sep 2025, 11:03

Does the "985" stamp mean it was manufactured in 2009?

Post by **abscate** » 11 Sep 2025, 15:21

My coils were stamped 9837 which means 37 week of 1998 - probably original to production date of the car, late 1998, 1999 model year

Post by **abscate** » 18 Sep 2025, 03:48

Might have time to swap in a used turbo control valve today to use the parts cannon approach

Post by **scot850** » 18 Sep 2025, 09:55

What makes you think it may be the TCV and not the ETM? The problem 07 C30 T5 I was trying to help with had an occasional surging idle at rest (not noticed while moving). It has had a used and a brand new TCV and no change. Still turns up randomly. The issue may not be the same for your car I appreciate. Do you have a spare ETM for an LPT engine? If not I am sure I do. Can't do anything for a week though until I get back to Calgary.

Neil.

Post by **abscate** » 09 Oct 2025, 13:25

Got some data.

Throttle position is showing glitches and throttle body error codes.

I’m not sure she is boosting well , photo of data on a pull

Post by **abscate** » 11 Oct 2025, 02:41

It’s an original!!! Year 1998 ETM

Picking up some throttle body codes. I’ve got a UBG S70 AWD ETM from the Kat

Post by **scot850** » 11 Oct 2025, 10:35

Straight swap. Unfortunately as you and I predicted it is the likely cause. PITA to swap on a turbo, but not too terrible. Good luck!

I have a bunch of LPT ETM's if your spare does not work.

Neil.

Post by **abscate** » 11 Oct 2025, 11:36

I swapped out the Kats yellow sticker trying to fix a problem of “ failure to proceed due to lack of fuel “ problem

Post by **scot850** » 11 Oct 2025, 17:17

Oh, no! Not again...................

Neil.

Post by **abscate** » 05 Nov 2025, 04:22

Update. The temps have fallen into the civilised 5-15 Celsius and the surging has stopped. My guess is it’s temperature sensitive to the ETM, so I’ll drive and monitor this winter