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Discussion Starter · #1 ·
Hi guys
I own a 1994 saab 9000 turbo (automatic). When I accelerate or decelerate, there is weird winding noise (even when in park). I thought its the turbo, so I removed it but the noise is still there. It sounds like a crank spinning, when you get off the accelerator the engine noise stops but you can still hear a loud spinning noise, like something is spinnig down.

Any help would be appreciated

thanks in advance
josh
 

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How are you running the engine without the turbo?

Engine bearings do not whine, they hammer.

Your torque converter still spins up and down even in park.

Without a better description of the type and source of the noise we cannot really help.

Open the hood, get a wooden dowel or long metal rod and place it carefully on various motionless parts of the engine and listen to the other end (like a stethoscope) to see if you can pinpoint the source of the noise, then descirbe what you hear and where.
 

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Discussion Starter · #5 ·
Hi guys, thanks for the reply's. The car isnt here at the moment its at the garage. Im just telling you what the mechanic said. He said he removed the turbo etc. He was also the one that suggested it might be the engine bearing. The sound is not really whine, more like a rusty roar. Thanks
 

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OK, so how on earth is this mechanic running the engine with no turbo installed?Without the turbo you cannot connect the exhaust so the engine would be so loud you would hear nothing at all, assuming it would run.

I suspect you are getting incorrect information somehow. Visit the car and ask to have the mechanic demonstrate the sound by running the engine. I'd be fascinated to hear what you learn.
 

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Discussion Starter · #7 ·
Sad news, just had a saab specialist come and have a look at the car. He said its the engine:cry: . He also said its very common with the new engines.
 

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So the Saab specialist said "its the engine". Was he was pointing to the big lump under the bonnet ?

Did he also say a little more sepcifically what was causing the noise (I assume he didn't say "its the engine")?:lol:
 

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Discussion Starter · #9 ·
Hi

He said it was Something about not changing the oil often enough and something getting miss aligned. My previous mechanic said it was the engine bearings. Everytime i accelerate or decelerate there is a big rusty roar sound.:roll:
 

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Where I live "josh" has a specific meaning.

I recommend you retrieve your SAAB, take it to an Isetta specialist and have the entire drivetrain transplanted. It won't sound better and it will burn more oil but the Isetta owner will be delighted.
 

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That's not the noise you get from the "shell bearings".

When the "big end" bearings go you get steady knocking from the crankpin hitting the inside of the failed connecting rod bearing (the "shell bearing"). Rarely does more than one bearing fail at one time. If the main bearings go you get a steady rumbling sort of banging sound caused by the crank moving around inside the loose clearances of the other set of "shell bearings". The cmain bearing can't knock like the connecting rod can because each connecting rod is only held onto the crank by one bearing whereas a four cylinder engine usually has five main bearings. The crank can't move easily to make the knock that a failed big end will make. None of these bearings make the noise you describe when they fail.

Almost all modern engines use "shell" type bearings on the crank because they can be replaced relatively easily. Main bearings are a pain because the crank itself has to come out even to replace only one failed bearing.

But, your description doesn't fit the diagnosis. Either you're joshing us or someone is joshing you. If you have a real complaint you need to get your car out of the shop it's in where the mechanics at the very least don't know how to explain the fault in terms you can follow, and most likely don't know how to repair it or perhaps even diagnose the problem either.

Basically, we can't help you on the information you're giving us because it cannot be correct, it is internally inconsistent.
 

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using the info you provided, im thinking that the lack of a turbo narrows it down a little. it could possibly be something with the exhaust. run the car and kind o crawl under it if you weigh less than 140 lbs otherwise the crawling under thing wont work. see if you can pinpoint if the sound is coming from before the intermediate flex pipe or not. take something that will blow in the wind but not catch fire i.e. a peice of fiberglass or something and run it along the exhaust. if that roar that you "heard" is coming from the exhaust you can find it using this method
 

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Discussion Starter · #16 ·
Thanks for the reply 9000 freak, but I had a new full exhaust fitted and its still the same. I think it is the shell bearings, because when I remove the air filter it sounds like a loud tapping noise which gets faster as i rev up and its still there when i deccelerate but then it goes down.
 
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