hi guys,
My first official post. I have been going through all of the post to find my issue and replaced a ton of things that are probably all still good. Let me first explain that the car has a ruff idle (shakes) and then stalls. I can stall and then not start back up for awhile. Background on this is I had this issue this time last year, Audi first replaced the LPFP and Low Pressure Sensor (found out it's also called a thrust sensor). I went back a couple of weeks later and they replaced the HPFP and Cam Follower. Car ran fine till October so about 11 months from the first replacement, but more than 30,000 miles later (for anyone thinking about warranties.
1. LPFP (from Audi)
2. Low Pressure Sensor (from Audi)
3. HPFP (from Audi)
4. Cam Follower (from Audi)
So I started trying to do the DIY to figure this out, pretty scary for a IT Guy, just doing the research. Finally after tons of post I read my check engine light and codes and I had Misfires and Lean codes. Replaced one coil even though most threads said to replace all coils and spark plugs, a day later I replaced all the Coils and the spark plugs. Check engine light goes out (probably because I keep disconnecting the battery) and then comes back on after some time.
5. Coils (autozone)
6. Spark Plugs (autozone)
After more reading and research I found that maybe it's pointing towards my turbo diverter valve (the forum referred to a recall and the replacement part). Mine was bad had the rubber and plastic one and replaced with the new one. Way more boost but yet right back to the same issue,
7. turbo diverter valve (from Audi)
Finally took the car to Audi in December, guy read the same codes and replaced with the coils and spark plugs with genuine Audi parts. Problem cleared temporarily but of course comes back. I did explain that but he had to start some where. After that I asked if there was a vacuum leak, this guy claimed no not at all. He called over seas kept the car a couple of days and says that I need to replace the injectors. I should also try to get the carbon cleaned.
Ok so before doing that, I tried cleaning the MAF...wasn't sure it worked, replaced the MAF, issue still there. I then replaced the PCV valve issue still there.
8. MAF (europaparts)
9. PCV valve and seal (Europaparts)
I finally caved took the car to a low budget mechanic to get the injectors replaced. On one hand this was the cheapest option (never do cheap again), guy offered to replace one injector for $50 bucks, cost me $150 for all four. I then asked if they would also clean out the carbon, luckily I got there before they closed everything up and sure enough this guy has not cleaned out anything. I asked and he said yes he cleaned my valves, shined a light and no he didn't even touch it. I gave him a good video by edge motors floating around on how to clean it out and went to buy everything even a vacuum and wire brushes. Claims he cleaned it all out and it's shining in there but he had everything together when I arrived the next day (I should have asked for pics for proof). Well in short problem still there.
10. Injectors with rings and seals.
11. Gunk cleaned maybe
Took the car to a Audi tuner shop. They claimed all this about their mechanic being an Audi mechanic and things. They come back to me after 2 1/2 weeks with I need an oil change, that my diverter valve is bad....they pulled the diverter valve and then came back with no it's actually good. Then they claimed that the (thrust) Low Pressure Fuel Sensor was bad and also the LPFP. Took the car back to Audi expecting that it was still under warranty and they missed it in December. Guys have really stepped up my warranty for the parts are 12 months or 12,000 miles, I missed the mileage by going 30,000 miles. Decided to work with me and not charge me labor only parts, they then replaced the LPFP, says there is not a problem with the Low Pressure Fuel sensor. After that they continued to test and found that my N80 was bad. Luckily I went in there and saw that my pipe from the PCV valve to the manifold had shrink wrap on it... yes the low budget mechanic broke the pipe and rather than replace he shrink wrapped it and broke the dip stick.
12. New LPFP (from Audi)
13. N80 (from Audi)
Car seemed to run fine but I kept hearing this swoosh sound of air, but ruff idle was gone. Decided to check under the hood and the pipe with the shrink wrapping was completely separated. Went and had the cheap mechanic give me the money to replace both parts. I think they probably also messed up the N80 when they took of the Manifold to replace the injectors and clean, but I got the parts from Audi.
14. Pipe from the PCV valve (from Audi)
15. Dip stick (from Audi)
Car back to running ruff on idle but not stalling. Seems like the car (cpu) is trying to adjust, it keeps getting smooth and then goes ruff again. Took the car back to Audi today, the Mechanic took his time again and pretty much can't figure it out. We here a vacuum leak, no whistling but just air somewhere low, but can't put our mind to where it must be coming from. He tried all his tests and nothing is pointing anything out. We discussed the O2 sensors, not sure what he did but he wants to reach out to other mechanics on this one. I opened the hood when I got home to try and figure out if I can find the vacuum leak, noticed he possibly moved the O2 sensor for testing.
Guys i'm completely out of thoughts and money, the mechanic is exhausted and stumped (wonderful guy though), wondering if any of you guys might have any thoughts on this one?
Tshon
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