[jareddspence]

I'm trying to determine an issue I've been having the last few days with my car.

2007 Saab 9-3 2.0T. 105K. Manual. Tuned by Mps

Under normal acceleration, everything is fine.
Under hard acceleration I start to lose power, appears that it stops revving any higher than the rpm I am already at. When I release the gas it goes back to normal but the blow off seems louder than usual. (My guess is the vacuum resealing)

No Check engine lights and no other issues. From what I've read online I think I have a vacuum leak somewhere.

Can anyone help me diagnose this? If this is the case, is it a difficult/costly fix?

Thanks!!

Jared

 

[Diggs]

"appears that it stops revving any higher than the rpm I am already at"

come again?

 

[jareddspence]

Ok, worded weirdly, but don't quite know how to explain.

When I'm starting hard acceleration , the power loss causes the rpm to not go any higher, even though I had my foot on the accelerator.

 

[jareddspence]

It's not accelerating, even though my foot had been on the gas.

 

[Diggs]

Sounds like a misfire. Try new plugs (NGK BPR7ES) first. If that doesn't work snag a coil and move it down the line to find the offending coil to replace. See the coil thread sticky to make sure you get the right coil.

 

[jareddspence]

It's been about 2 years since I put in plugs, so you'd start there?

 

[Diggs]

It's been about 2 years since I put in plugs, so you'd start there?

They're like $10 for 4. Yes.

 

[jareddspence]

Didn't change my own plugs the last time, are they pretty easy to do yourself?

 

[jareddspence]

And do you have any links for the Plugs to buy? Havent been able to find them online yet

 

[Diggs]

Didn't change my own plugs the last time, are they pretty easy to do yourself?

Super easy.

https://www.youtube.com/watch?v=6SQtioPiIL4

 

[Diggs]

http://www.autozone.com/external-engine/spark-plug/ngk-standard-copper-spark-plug/509933/

 

[jareddspence]

Awesome, thanks for the help!

 

[talldude]

Check the bypass valve on the turbo too: http://www.saabcentral.com/forums/showpost.php?p=5076706&postcount=5

 

[jareddspence]

Any help on installing spark plugs. The spark plug socket I have won't fit into the hole with the new ngk spark plugs

 

[Diggs]

Get a new socket.

 

[jareddspence]

Yes I know I need a thinner socket. The ngks are 13/16 and the ones I've tried don't for the saab socket hole. Is there a brand if thin walled that are good.