Saabscene Saab Forum - Saab Technical Information Resource banner
1 - 15 of 15 Posts

·
Registered
Joined
·
252 Posts
Discussion Starter · #1 ·
While overtaking on the way to work this morning, it felt like I didn’t have the usual shove as I changed down and accelerated. After a while she seemed ok again, although admittedly the rest of the journey was in slow traffic.

While driving home all seemed ok, even when booting through an A-Road the turbo was doing it’s job.

However, about 20 miles from home I dropped to 4th to overtake uphill on the motorway and….. nothing. No boost whatsoever, just a strange sounding induction noise as I put my foot down.

Moved off onto A-roads and tried accelerating in 2nd…. Definitely no boost. No whistle from the turbo, not wooosh from the waste gate as I change gear.

She’s running smoothly, idles fine, no smoke, no pipes appear to have come off, just no boost! Any ideas guys?

BTW - ’94 CSE 2.0 LPT EcoPower. No intercooler, has a BPC (APC?? Not sure what the correct name is!) valve on the top right side of the radiator.
 

·
Registered
Joined
·
252 Posts
Discussion Starter · #3 ·
I'll double check that the pipe from the BPC valve hasn't come off or split etc, but when I looked briefly last night, all appeared to be where it should!

Are wastegate actualtors know to fail?
If so, as a test, could I remove the BPC from the equasion and connect the "compressor nozzle" to the "wastegate actuator nozzle" and test if boost has returned?

The reason I ask is that the turbo I currently have came from a scrappy. When it arrive, it obviously came from a car with no BPC as the 2 nozzles were connected as described above.

Cheers.
 

·
Registered
Joined
·
252 Posts
Discussion Starter · #5 ·
Ah, ok - I've just been searching around the site and this seems a common fault. I'll have a poke around later, thanks for your input.

Fingers crossed - anything other than having to drive to work in the girlfriends Diesel Escort!

Failing that, is there anything else that it could be?
 

·
Registered
Joined
·
8,216 Posts
Originally posted by Jules:
[qb]No boost whatsoever, just a strange sounding induction noise as I put my foot down.[/qb][/b]
Whether you can see it or not, this sounds like a leak. Look at all the pipes again, especially those on the underside of the throttle body, as these are easy to miss. Also check the pipes on the intercooler haven't popped off.
 

·
Registered
Joined
·
252 Posts
Discussion Starter · #7 ·
Ok Bill, I'll have a look, thanks. I initially thought that one of the main intake pipes had come off as the inductions noise was a deep muffled roar.

The engine feels as if it's "choked".

I am quite concerned about the lack of whistle from the turbo. Before I had this problem, I got a very prominant sound as the turbo wound up. Is it possible I have some sort of mechanical failure in the turbo?
 

·
Registered
Joined
·
2,041 Posts
Jules
I have had just had a similar problem with my GM 900FPT - after doing all the usual stuff replaced the exhaust rear boxes which resulted in full boost returning - see this thread - it is rather long but cover most possible faults - No Boost

Mike
 

·
Registered
Joined
·
1,245 Posts
Recently had a similar problem on my 2.3T. The rubber hose to the Boost gauge and BPV had split. On investigation all of the vacuum/pressure hoses had turned into something resembling flexible charcoal
. Replacement fixed my boost problem with even more than before. I reckon they had been leaking at the connections for sometime.
 

·
Registered
Joined
·
252 Posts
Discussion Starter · #11 ·
Cheers for the input guys. I'm working close to home today, so at lunch time I had the opportunity to have a proper look.

All hoses are attached where they should be (I had a check under the throttle body Bill, all look present and secure).

Reached under the turbo itself, the actuator rod is swinging in mid air! I haven't had a chance to jack the car up and have a good look, but it definately ain't attached to the turbo body (although I can't actually feel where it is supposed to go.....)

It feels like the rod has a hole drilled through the end, which I am guessing slips over a pin on the turbo, and the offending split-pin or circlip that 9000*Turbo*16 mentions has fallen off.

Sound about right guys?

So if my unserstanding is correct, with the rod unattached, the wastegate is open, thus preventing any pressure to build up?

Many thanks
 

·
Registered
Joined
·
1,245 Posts
Good you've found the problem Jules. There used to be an E-clip there but it has corroded away. Same happened to mine 2 or 3 years ago. There is a hole in the shaft through which you can fit a split pin with a washer under it which is what I did. Been fine for the last 40K miles. B**ger to get at though. I remember working from underneath the car mostly by feel.
 

·
Registered
Joined
·
252 Posts
Discussion Starter · #14 ·
Thanks Derek - jacked it up on Sunday and located the split pit hole. Having no split pin, or paper clip to hand I used a key ring! Managed to slide it round and round until it clicked into place.

I don't fancy its chances of falling out in a hurry!
 
1 - 15 of 15 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top