Allroad cuts off and is hard to start

[raymon823]

Hello, I've been lurking around for a while looking for a ar well I found one for dirt cheep that I could not pass up. Ok so I picked the car up Saturday morning, the Po was telling me that some times it cuts off and is really hard to start. Well as I have the car idling waiting to pull it up on the trailer low and behold it begins to stumble and just cuts off. To get it going again the po pulled the fuel pump fuse and it starts up after a couple seconds of cranking and cuts back off, so I kept starting it with the fuse out until it would not start anymore. Then we reinstalled the fuel pump fuse and it starts up, it seems to be flooded. I'm new to this engine so I'm thinking the pressure regulator is bad or maybe a vacuum leak. The car has a cel for a bad catalytic converter. I searched for starting issues but none seemed to be the same issue that I'm having. Any help would be greatly appreciated. I have not been able to completely go over the car yet. Right now its at the shop and I can pull all codes and get it in the air tomorrow.





Well here she is 03 ar 160,000 6sp
Loaded up ready for the trip to her new home.
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[awdjunkies]

Beautiful and 6 speed to boot, congratulations on the purcahse, NOW what you need to do is purchase(If you don't already have one) a Vag Com (www.ross-tech.com ) because this tool will pay for itself a million times over.. Either way, have it scanned for codes to narrow down your search and headaches. check for leaks as you describe, also check to see if the TBB boot is not torn as well as any other boost pipe/hoses.

[raymon823]

Thanks, yeah I'm looking to purchase the vagcom next week and I will report back tomorrow with my findings.

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[eejimm]

Cat code is not unusual, lots of posts about that here. Hard starting is often a bad temperature sensor, making the ECU think the engine is warm when it's not. VAG-COM will tell you for sure.
Jim

[raymon823]

Jim you were right first code was a coolant temp sensor 16502 followed with exhaust gas temp sensor shorted to ground 17866 follow by cat code and a bunch of intermittent misfire codes. Thanks for your help guys. Now I have to get some tags and put some miles on

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[Zachariah]

At 160k - you're pushing the useful limit of the fuel pump. They are due to suddenly die, between 150k-185k. Ask me HOW I know....

[raymon823]

Lol you jinxed me fuel pump doa at 168k

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[Zachariah]

Glad you sorted that out. Too bad a dead FP shows no codes whatsoever. Be prepared to handle a laundry list of future repairs:

- Thermostat housing. If plastic, it will FAIL catastrophically. Replace with alloy S4 housing.
- Coolant Temperature Sensor. Replace with GREEN OEM one, not the China-made, Meyle copy!
- N80 Evaporative Purge Valve
- Both front(pre-Catalytic) Oxygen sensors
- Coolant After-run pump/switch
- EGT Sensors. You will get short-to-ground(DOA) codes and lean/rich codes. Passenger side is easy to change. Driver side will have you swearing like a sex-starved sailor. Good thing you can fully DELETE them out with these resistors:
http://forums.quattroworld.com/class...gs/28162.phtml
- Airsprings. Fronts usually go bad, by 170k/mi MAX. Rears almost never do, because they support such little weight.
- Throttle body boot. Car will run like crap, when accelerating.
- Fuel Filter. Hopefully, this was changed when the fuel pump was done too.
- Auxiliary Cooling Fan/Fan Module
- Mechanical, belt-driven fan. Check for cracks, NOW. When this explodes inside the engine bay - it leaves no survivors!
- A/C G65 high-pressure switch. Intermittent A/C cutoff(random ECON mode) is characterized by this failure.
- Coolant reservoir tank/ cap. Replace the yellowing original ASAP.
- Boost pressure "Y" hoses. If you hear a howl between 3000-4000rpm - this is the problem...they get torn easily.
- Coil packs/ICM modules/Spark plugs. Common causes of engine misfires.
- Crank Position Sensor. Hard start/no start is also caused by failure of this important sensor.

I'll STOP HERE....