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Saab 9000 2.3 turbo - boost problems


Bob

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Thought I'd post this here as there's a lot of people on here that know a fair amount about turbo'd engines!

 

My father-in-law has a 2.3 turbo but has been having problems when under boost. It only happens occasionally and sometimes clears up, sometimes doesn't. It sometimes gets cured when restarting the engine, sometimes doesn't.

Basically, he's getting engine 'flutter' when the car should be boosting. We originally thought maybe ignition issues, but a virtually new ignition system has proved fruitless. It's as if the turbo is cutting in and out then completely out.

 

A hefty spray of WD40 around the ECU wiring loom seemed to have helped it, but then it came back the same as before. One mechanic believes that the wiring loom may be 'cracked'.

 

All hoses have been checked and there seem to be no leaks or cracks.

 

The next attempt is to replace the fuel filter (only £45) but I doubt that it's fuel related - I owuld have imagined the car would be running higher temperatures / coolant temps if it was leaning out that much under boost?

 

I'm gonna have a poke around when it stops raining and when I'm sober (visiting the in-laws in Antrim this weekend. 'When in Rome . . .' and all that :D), if the system is anything like the soop's I would be suspecting dodgy control valve thingummys.

 

If anyone can shed some light it'd be much sppreciated. :)

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  • 5 months later...

Old post to reply to, but it may help.

 

What do you mean by 'flutter'

 

If it isn't holding boost and the power is oscillating, the most likely culprit is the APC solenoid valve which controls the wastegate opening. These are easy to replace (apart from £105) but if it is possible to get a known good valve to test with it only takes a few easy minutes to swap them over.

 

Searching or pasting at http://www.saabscene.com should provide all the info you need.

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