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Title: Seeking advise, info Audi S4 Post by: RaySimpson91 on December 02, 2023, 11:32:39 PM Seeking help here. Long story short, I recently acquired a 2005 (.5?) audi S4 with the 4.2 and automatic. When I picked it up, it had sat for 3 months, when it started it had a little chain clatter, but went away pretty quick. Upon letting it warm up it has codes galore, misfire codes on almost every cylinder, MAF codes and a few others. The PO stated the guy they got it from mentioned something about trying to tune himself. I have zero history on the car, it’s in great shape just needs attention, TLC and cleaned up. I plan on running a compression test for piece of mind, checked the plugs and all seem the same color, decent shape. I have actually done timing chains on one of these years ago with a friend, so I’m not afraid to do that (plan on it anyway). I’ve had a similar issue, years ago I had a wrx and a friend tuned it using a tactrix cable, needless to say it ended bad, and had someone else do it with zero issues. Can someone lend some insight on which direction I should go? I’ve read about a VAGCOM cable and VCDS? I’m a diesel/heavy equipment mechanic so I’m not green when it comes to turning wrenches and repairing/reading via diagnostic software, but am when it comes to this audi. Any advise is appreciated. Thank you
Title: Re: Seeking advise, info Audi S4 Post by: BlackT on December 03, 2023, 02:39:39 AM What is problem with car?
Title: Re: Seeking advise, info Audi S4 Post by: RaySimpson91 on December 03, 2023, 04:31:34 PM The car has bad misfires, misfire codes on almost every cylinder, MAF code. Wondering where to start. I’ve read that maybe broken chain guide can cause chain to jump a tooth?
Title: Re: Seeking advise, info Audi S4 Post by: nyet on December 03, 2023, 05:41:57 PM Start by flashing a stock file.
Title: Re: Seeking advise, info Audi S4 Post by: RaySimpson91 on December 03, 2023, 07:47:21 PM Start by flashing a stock file. As soon as I get a computer on it I will try the steps you suggested, much appreciated Title: Re: Seeking advise, info Audi S4 Post by: RaySimpson91 on December 03, 2023, 08:31:01 PM As soon as I get a computer on it I will try the steps you suggested, much appreciated Best place to find a stock file?Title: Re: Seeking advise, info Audi S4 Post by: _nameless on December 03, 2023, 09:24:40 PM Do you have a vcds scan or a picture of the ecu? I can check my database and see if I have a stock file for that
Title: Re: Seeking advise, info Audi S4 Post by: BlackT on December 04, 2023, 02:25:45 AM The car has bad misfires, misfire codes on almost every cylinder, MAF code. Wondering where to start. I’ve read that maybe broken chain guide can cause chain to jump a tooth? Try to rev it to 3000 and see will it have DTCsTitle: Re: Seeking advise, info Audi S4 Post by: Audiquattro44 on December 04, 2023, 01:46:38 PM The car has bad misfires, misfire codes on almost every cylinder, MAF code. Wondering where to start. I’ve read that maybe broken chain guide can cause chain to jump a tooth? Change the chain and everything that goes with it Title: Re: Seeking advise, info Audi S4 Post by: RaySimpson91 on December 27, 2023, 08:33:10 PM Finally got around to digging into it, I found the exhaust cam on pass side is a few degrees off, so I’m hopeful it must have jumped a tooth or two, and my new timing and guide/ tensioner kit will solve the problem. With the engine out is there any suggestions on anything else to take care of?
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