RaySimpson91
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« on: December 02, 2023, 11:32:39 PM »
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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
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« Last Edit: December 02, 2023, 11:57:07 PM by RaySimpson91 »
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BlackT
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« Reply #1 on: December 03, 2023, 02:39:39 AM »
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What is problem with car?
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RaySimpson91
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« Reply #2 on: December 03, 2023, 04:31:34 PM »
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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?
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nyet
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« Reply #3 on: December 03, 2023, 05:41:57 PM »
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Start by flashing a stock file.
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RaySimpson91
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« Reply #4 on: December 03, 2023, 07:47:21 PM »
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Start by flashing a stock file.
As soon as I get a computer on it I will try the steps you suggested, much appreciated |
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RaySimpson91
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« Reply #5 on: December 03, 2023, 08:31:01 PM »
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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? |
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_nameless
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« Reply #6 on: December 03, 2023, 09:24:40 PM »
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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
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If you are in the market for a tune and would like the ease of downloading and flashing a dyno tested tune for a fair price check out https://instatune.sellfy.store/ |
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BlackT
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« Reply #7 on: December 04, 2023, 02:25:45 AM »
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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 DTCs |
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Audiquattro44
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« Reply #8 on: December 04, 2023, 01:46:38 PM »
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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 |
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RaySimpson91
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« Reply #9 on: December 27, 2023, 08:33:10 PM »
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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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