The Saab Network Now Mailing List FAQ
| |
|
[ Prev by Date ] [ Next by Date ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
RE: Turbo Cough
Posted by Anthony Graham Eckersall (more from Anthony Graham Eckersall) on Tue, 17 Jul 2001 08:57:53
In Reply to: Turbo Cough, Don Bryant, Sat, 14 Jul 2001 11:26:39
Don,
Can you tell me with the car in 4th, at low revs (i.e. 1800 rpm), if you
gently press the accelerator, so that the boost only rises slowly, how far
up the gauge does the needle get.
When the fuel cut off is operating, it can seem like its cutting in as the
needle moves from the yellow across the gap in-between the yellow and the
red., this is because your boost gauge is slow, they all are, the pressure
can in fact be much higher.
Therefore to see the real pressure present in your manifold and hence find
the fault you need to let the boost rise slowly, to enable the gauge to show
you properly.
If when doing this test you see the needle rise into the red area, then you
have a computer or waste gate problem, and as a result your turbo is
overcharging your engine. This is dangerous and must be prevented ASAP.
Hence the Saab fuel cut off system. Although this system works, it is not
designed to be the limiting factor for boost, and as a result every time it
operates your engine is being damaged by the momentary high pressure present
in the manifold.
If you find that I am correct and that your needle does indeed start to move
into the red area of the gauge, you need to get it fixed right away.
Possible causes are :- faulty APC computer, Faulty APC control valve, Faulty
Waste gate Actuator, Faulty Waste gate, or Damaged control piping.
Keep your fingers crossed that a pipe has fell off.!!
Let me know what you find, I spent 8 months trying to track down a turbo
fault. I had the whole system to pieces, so I know these turbo control
systems like the back of my hand. Depending on what you find there are a
number of simple tests that can help you find the faulty part and replace it
yourself hence saving many $$$$$.
Hope this has helped.
Regards
Anthony Graham Eckersall
Posts in this Thread:
- Turbo Cough, Don Bryant, Sat, 14 Jul 2001 11:26:39
- RE: Turbo Cough, Anthony Graham Eckersall, Tue, 17 Jul 2001 08:57:53
- Re: Turbo Cough, James Law, Mon, 16 Jul 2001 10:58:51
- Re: Turbo Cough, Zargapolus, Sun, 15 Jul 2001 12:03:51
- Re: Turbo Cough, Swede Boy, Sun, 15 Jul 2001 12:03:51
- RE: Turbo Cough, Mark Cook, Sat, 14 Jul 2001 12:59:12
StateOfNine.com
 |
SaabClub.com
 |
Jak Stoll Performance
 |
M Car Covers
 |
Ad Available
 |
  
This is a moderated FAQ - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no Spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. TSN has been a moderated forum since 1988. For usage guidelines, see the
TSN Mission and Purpose Page. Please remember that you are
not anonymous
Your address is: 18.116.23.197 - Using Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com) - Logged.
|