1. Home
  2. SAAB Cars Forum
  3. Re: 9000 turbo - no power

Re: 9000 turbo - no power

> I looked at a 94 9000 CDE this weekend that was in exceptional shape, > except for one important aspect - the car really had no boost. Even > though it was automatic, the turbo should still create a good amount of > accelleration. The turbo guage indicated normal boost, same as my 900 > turbo. I never owned a 9000, but have test drove few, and all the turbo > models had good power to them. > > Any ideas on what could be the problem? There was no smoke out of the > exhaust, so it did not indicate if the turbo was worn or DOA.

Wastegate rod could just be disconnected - the clip that holds it on usually rusts off.

But I don't know what the boost gauge would say (since my CS doesn't have one) if that was the case.

Reply to
Bob(but not that Bob)
Loading thread data ...

If the waste gate actuator was disconnected it would never open and you would develop too much boost. This would be seen as lots of pep until it hits an over boost state and the ECU then shuts down the fuel injection and ignition.

-Fred W

Reply to
Malt_Hound

Are you sure about this? I thought the wastegate was left _open_ when the actuator was disconnected (i.e., all the precious engine fumes bypass the turbo).

My '95 9K LPT experienced exactly this (felt 'ordinarily aspired' and lacked power). Looking first here in the NG and then under the turbo conformed the diagnosis: locking pin gone, rod disconnected.

regards Per

Reply to
Per Laursen

Hmmm, you may be right. From the SAAB WIS:

"The wastegate is a flap valve which opens and closes the bypass channel at the side of the turbo wheel. The flap valve is operated by a lever from the diaphragm unit which is located by the compressor housing. The diaphragm is operated by the pressure in the compressor and a spring in the diaphragm unit has the function of closing the flap.

During low and normal loads the wastegate is closed. When the load increases and the turbo pressure comes close to the maximum permitted, the force of the spring is overcome and the wastegate opens the bypass channel, which reduces the pressure."

Perhaps when the clip falls off and there is no connection to the diaphragm spring the wastegate is then free to flap around willy-nilly.

Sorry about the confusion.

-Fred W

Reply to
Malt_Hound

I have a 9k 2.0 lpt that feels that way too.

Also it won't rev much above 5000 ( depending on gear ) - did you have similar symptoms ?

Graham

Reply to
Pooh Bear

Sorry, but I can't remember.. this was around 2 years ago (probably not, though - I don't meet 5000 rpm that often :) . I do, however, remember the very clear difference from the normal (although only base) boost to the 'no boost'. Confirming the diagnosis and fixing it was a 10-minute job.

regards Per

Reply to
Per Laursen

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.