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Re: 2011 9-3X rough initial idle when started, hot or cold Posted by Bernie [Email] (#1501) [Profile/Gallery] (more from Bernie) on Sat, 18 Dec 2021 11:21:40 In Reply to: 2011 9-3X rough initial idle when started, hot or cold, GoldenSaab [Profile/Gallery] , Thu, 16 Dec 2021 14:25:24 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Hello,
Have the plugs ever been changed in the car? It seems that on the 10 and 11 they need changed around 50k. But that being said it sort of sounds like carbon build up on the intake valves. When you have carbon build up it tends to absorb some of the fuel when you start the car. So yes I would try some fuel additives to see if that clears it up.
I do recommend the BG 44k but you would have to find a shop that uses it to buy some or maybe someone sells it online. I like it because if you go back to the late 80's early 90's when Audi had a severe problem with valve deposits that they were removing intake manifolds and media blasting the intake valves to clean them could be cleaned by adding a can to full tank and driving it a few hundred miles. Good Luck, Bernie
_______________________________________ George Riggin Specialty Automotive Current Saabs 1993 900 Turbo Conv. 1993 900 Turbo Conv. Auto 2003 9-3 Conv 2004 9-5 Arc Sedan 2005 9-3 SS 4 door 2005 9-3 SS Conv 2007 9-5 Aero Sedan 1986 900 Turbo Conv A few parts cars also
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