Will not start

Tiny
MARCUSSCHAARUP
  • 2006 AUDI A6
  • 2.4L
  • 6 CYL
  • 2WD
  • MANUAL
  • 260,000 MILES

First it broke down on the road, we bring the car home and inspect. We changed some relays J271 and the ignition coil was shorted and then we replaced the coils and the engine starts, but runs not great. Now the car will not start because the fuel pump is not running.
The tester said that it is a relay, but I have replaced that too.

Can you help? Thanks

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Monday, July 31st, 2017 AT 10:25 AM

46 Replies

Tiny
2CARPROS KEN
  • ADMIN
  • 9,558 POSTS

Hello,

It sounds like the crankshaft angle sensor has gone bad and the computer is not turning the fuel pump on becasue it does not see the engine turning over.

Here is a guide that will show you what you are in for when doing the job:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

and

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

and

https://www.2carpros.com/articles/car-cranks-but-wont-start

Here are some diagrams to show you how it is done on your car.

At left front of transmission housing.

Please let us know what happens.

Cheers, Ken

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Wednesday, August 2nd, 2017 AT 11:33 AM
Tiny
MUGABE
  • 2006 AUDI A6
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 83,452 MILES

My 2006 Audi A6 does not start.

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
RASMATAZ
  • MEMBER

Is it cranking over and will not start or just will not crank over at all/nothing when key at starting position?

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
AUSTIN WEN
  • 2005 AUDI A6
  • 4.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 123,000 MILES

So I only had this car for three days, but I am stressing out about it already. I can start the car in the beginning of the day, then take me an hour to start it again when I stop the engine. Battery is good, I do not know what the problem is. Can you please help?
Thank you.

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
CARADIODOC
  • EXPERT
  • 28,562 POSTS

You are describing the classic symptom of a failing crankshaft position sensor or camshaft position sensor. They commonly fail by becoming heat-sensitive, then they will work again after cooling down for about an hour. While driving, natural air flow keeps them cool. When a hot engine is stopped, the heat migrates up to those sensors and can cause them to fail until they cool down. This can happen on any brand of engine and is easily overlooked at a used-car dealership because they do not drive the cars long enough for the problem to become apparent.

There will usually be a diagnostic fault code set to indicate when a sensor circuit's signal is missing. The place to start is by having the fault codes read and recorded. The people at many auto parts stores will read them for you for free.

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
AUSTIN WEN
  • MEMBER

Thank you very much. Can you give me estimate price if I take the car to the shop after I get the code? Just an estimate price range.

Thank you again.

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
CARADIODOC
  • EXPERT
  • 28,562 POSTS

Sorry, I would like to, but there are way too many variables. The additional point of value is diagnostic fault codes never say to replace parts or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a part is referenced in a fault code, it is actually the cause of that code about half of the time. First we rule out wiring and connector terminal problems associated with the sensor or part, before we order the part. Electrical parts can rarely be returned because so many are damaged upon incorrect installation, and the parts store does not want to risk selling you a defective part that someone else returned. For that reason, the mechanic has to be pretty sure that part is really needed.

The next problem is some sensors are really easy to replace. Many can be replaced on Chrysler and Ford products in two or three minutes. On some engines a lot of disassembly is required, and they can take well over an hour. Add the additional time to get to a sensor to take some voltage readings, and you might add another hour diagnostic time to the part replacement time. I am not familiar with Audi engines but I did find your crankshaft position sensor is listed in the "flat rate" guide as taking 1.1 hours for just the replacement. That tells me it is a pretty involved job.

Remember, nothing has been diagnosed yet either. There are a number of computers and electronic modules that can cause a crank/no-start. I only jumped on the sensors because the failure only when hot is such a common symptom with them. No conscientious mechanic would waste an hour of your dollars based solely on the symptoms. If he is wrong, how are you going to feel when he tells you your money was wasted on his guess? Worse yet, how is he going to feel when you call the shop and tell him the problem occurred again when you are twenty miles from the shop?

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
HUGODB
  • 2002 AUDI A6
  • 2.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 250,000 MILES

I find that there is no signal or power to the fuel pump or fuel pump relay. What could be possible causes of this?

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
2CARPROS RENEE
  • ADMIN
  • 679 POSTS

Hi HUGODB,

While you are waiting for one our experts to answer your question here is a link to an informative article from this site with step by step instructions and pictures and a video on what to check for when your vehicle cranks, but will not start.

https://www.2carpros.com/articles/car-cranks-but-wont-start

If you need any further help please come back to the site as we are always happy to help.

Thank you for visiting 2CarPros.

Kindest regards,

Renee
Admin

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
DRAKER77
  • 2002 AUDI A6
  • 167,000 MILES

Sounds like only starter is turning.

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
FIXITMR
  • MEMBER

Maybe starter drive has failed (slipping).

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Wednesday, August 2nd, 2017 AT 11:35 AM (Merged)
Tiny
TONEGETBUZY
  • 2001 AUDI A6

2001 Audi A6 six cylinder all wheel drive automatic 106, 00 miles.

Been driving well for the last three years with no problems. I went to start my car the other morning and it would not start. I have a new battery in the car and it still will not start. It did try to turn over but now it just whines when I turn the key. All power is good. All of the fuses are good. Just want to have an idea to what it may be and what money I may put out. Thank you

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Wednesday, August 2nd, 2017 AT 11:36 AM (Merged)
Tiny
DOCFIXIT
  • EXPERT
  • 19,004 POSTS

Starter fault. The whine is motor turning but pinion gear not engaging flywheel.

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Wednesday, August 2nd, 2017 AT 11:36 AM (Merged)
Tiny
TONEGETBUZY
  • MEMBER

My battery is now finally starting to drain, would that have anything to do with my alternator?

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Wednesday, August 2nd, 2017 AT 11:36 AM (Merged)
Tiny
DOCFIXIT
  • EXPERT
  • 19,004 POSTS

Go to Auto Zone have alternator checked then you will know. Also if alternator good may have drain caused by a circuit staying on when key off. Like trunk light, glove box etc.

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Wednesday, August 2nd, 2017 AT 11:36 AM (Merged)
Tiny
ANGELITO1
  • 2001 AUDI A6

2001 Audi A6 six cylinder all wheel drive automatic 70,000 miles.

I tried to start the car jumping with my other car but the only noise I hear is like a woodpecker. Lights inside working good deems a little when attempting start. Can anyone give me an idea what to do and look for next? I would really appreciate it.

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Wednesday, August 2nd, 2017 AT 11:36 AM (Merged)
Tiny
RASMATAZ
  • MEMBER

Fuel and Spark:
Get a helper disconnect a spark plug wire or two and ground it to the engine at least 3/16 away from ground -have helper crank engine over do you have a snapping blue spark? If so you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer.

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Wednesday, August 2nd, 2017 AT 11:36 AM (Merged)
Tiny
LAIMIS
  • 2000 AUDI A6
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 117,000 MILES

My 2000 Audi A6 2.8 V6 having trouble starting in a really cold weather. This problem occurs for past six years. Previous owner took car to dealership five times they could not find the problem.
When you try start the engine the starter cranks but the engine will not start (sounds like "dry" crank). After several attempts the engine starts but misfires, shakes, backfires. If you let engine run for minute or two and turn it off, it will start back up without any problems. Mechanics at dealership tried change spark plugs, plug wires, couple injectors, flushed the fuel system tested computer. The same result. It runs okay and starts when the engine is warm, but in a cold winter morning no.
I put new spark plugs, Karlyn wires, Karlyn ignition coil pack, new battery-the same problem. It takes ten to fifteen times of cranking until you get engine run. After it runs for minute or two no problems, starts right away. Yesterday I took to shop, hooked up computer and everything works fine, no cylinders misfiring O2 sensors okay, fuel system okay, everything normal. We deleted faults. This morning the same problem it will not start and the check engine light came on. Please advise. Thanks.

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Wednesday, August 2nd, 2017 AT 11:36 AM (Merged)
Tiny
MMPRINCE4000
  • EXPERT
  • 8,700 POSTS

First check fuel pressure with mechanical gauge. Some engines have a "cold start valve" which only works when cranking adding addition gas to engine when cold.

Newer engines simply increase injector pulse time, which is controlled by PCM.

But, I would start with fuel pressure check.

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Wednesday, August 2nd, 2017 AT 11:36 AM (Merged)
Tiny
VRMNYCVRM
  • 2000 AUDI A6

2000 Audi A6 six cylinder four wheel drive automatic 128,000 miles.

On they way back from a long trip, I saw a check engine light. I disconnected battery to reset trouble codes. Did not work, and car will not start. Help!

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Wednesday, August 2nd, 2017 AT 11:37 AM (Merged)

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