2003 Audi tt 225 suddenly will not start???

[pinot007]

Ok, this happened to me a few weeks ago, drove car just fine and one day it just will not start. It cranks over just fine but will not fire up. A few weeks ago a shop got the car they found a bad wire connection for Intake Air Sensor and repaired it. Prior to them getting it it threw up 3 codes to which the shop said, it may be one or all three of these at fault. We'll start with one and see if it clears the other codes. Here was the readout:

Scanne System: Code 16395 Camshaft A (intake) retarde, Code 16497 Intake Temp Sensor Signal too high, Code 16795 secondary Air Injection System incorrect flow.

After replacing wire harness i had them replace the fuel filter, oil and new spark plugs. The timing belt/pump replaced recently as well and I believe the fuel pump was replaced not to long ago either. What else should I start looking at?
*note the dash display for fuel and temp have been wonky for a few months, (i suspect the usual dash pod problems).

With that, what else? The car when running is smooth and it has no problems what so ever but yesterday after a 40 min drive and a quick stop, when i went to start it kind of bobbled/jumped around on the initial start (i gave a bit of gas) and it smoothed out. And now today, after driving 40 mins to work, it sitting for 8 hrs, it will not start. Please help??


Cheers

UPDATE: 1/18 This morning it started on the first crank. It idle's smooth and without problems. While running I removed the engine plastic cover and upon doing this could hear a whistling sound of air. One of the hoses on the top (what are these called, there are about 10-12 running all over the top and look like they connect to the ignition? and a sensor) One of the small hoses is almost torn all the way thru. Hmmmmmm

UPDATE: 1/20 I replaced the fuel pump relay and hose. Car started first crank again this morning. I also got the diagnostic code read: P0411 having to do with secondary air injection. Could this be related to the hose that was 3/4 severed through?

UPDATE: 1/31 The TT has been at the shop since last Friday when I didn't start. Since it has been there, the technician has started/stopped and driven the car (5 days) without any problems at all. There are no codes being thrown other then saying my secondary air pump might be going bad. This is so frustrating and they say there is nothing they can really do until if fails (does not start again). They did visual checks over the car as well..

[TheSupervisor]

Sounds like a bit of a mix of electrical and vacuum problems. Did replacing the harness clear your cam and intake temp codes?
Also vacuum leaks can definitely cause SAI codes bevause the kombi valve that regulates flow from the pump runs on vac. Id recommend doing a boost leak test. There are guides all over on how to make one for your engine. This will reveal any boost leaks as well as pressurize the vac system so you can listen for other leaks. Time and heat like to kill vac systems.

Vacuum however shouldnt have any effect whether the vehicle starts or not. You may want to check the ignition system. I'm still learning about the specifics of these engines myself but I know there were coil pack issues (recall?) I think most have been warrantied but you never know.

[pinot007]

Sounds like a bit of a mix of electrical and vacuum problems. Did replacing the harness clear your cam and intake temp codes?
Also vacuum leaks can definitely cause SAI codes bevause the kombi valve that regulates flow from the pump runs on vac. Id recommend doing a boost leak test. There are guides all over on how to make one for your engine. This will reveal any boost leaks as well as pressurize the vac system so you can listen for other leaks. Time and heat like to kill vac systems.

Vacuum however shouldnt have any effect whether the vehicle starts or not. You may want to check the ignition system. I'm still learning about the specifics of these engines myself but I know there were coil pack issues (recall?) I think most have been warrantied but you never know.

@TheSupervisor thank you for the reply. It does sound a bit like that, my exact thoughts. Yes, the new harness did clear up all the fault codes. And yes, I'm also looking at coil packs and such but so far after fuel pump relay and hose repair, it's been starting first crank and running smooth. I may take it to a shop soon to check a few other things and do some basic maintenance. (want to upgrade brakes/hoses). Thanks again mate!

[pinot007]

Ok, this is getting old. This morning the 03 TT 225 decided it did not want to start after starting first twist of the key the last 5 days. What I noticed this time was when I turned the key the first time I heard the fuel pump start to prime but stopped very short of the usual time it takes. I fired it over and it tried to start, stumbled for a few seconds then died. The next cranks nothing at all. (checked fuel pump fuse, swapped with another 20a). It cranks as usual but not firing.

This leads me to ask... could it be the fuel pumps gone bad? Are these symptoms what anyone else have dealt with? It is a used TT with 150k on it.. and I do not know if the fuel pump has ever been replaced.

Cheers

[Nate01A4]

I been having the same issues. ended up being crankshaft speed sensor.

[pinot007]

I been having the same issues. ended up being crankshaft speed sensor.

Hey Nate, thanks for the reply. Well, after the car driving just fine (starting, running and stopping) the last week, it did the usual thing and would not start last night after work.. same exact thing. Did a read of the codes and it threw up a P0411 for secondary air injection. When you were having issues, did you get any codes?

I so need to get this problem fixed.. dragging on for a few months now.

[pinot007]

Ok, so some updated news on the TT not starting. It decided not to start a few days ago and sat. I tried cranking over a few times a day with no starting. Then today, I decided to give the TT a push (not that fast) and drop into gear. It did the usual lurching, never really looking to start. Upon my next crank it fired right up! Soooooo, this to me indicates a faulty crankshaft speed sensor or Camshaft sensor because I shifted those rotation points. Audi of America called me this morning and in the discussion said because it has not thrown up a fault code for the sensor does not mean the contacts are dirty and need to be clean.. usually throws fault code if in fact the part has failed.

Glad it has started and narrowed down!

[pinot007]

Ok, so some updated news on the TT not starting. It decided not to start a few days ago and sat. I tried cranking over a few times a day with no starting. Then today, I decided to give the TT a push (not that fast) and drop into gear. It did the usual lurching, never really looking to start. Upon my next crank it fired right up! Soooooo, this to me indicates a faulty crankshaft speed sensor or Camshaft sensor because I shifted those rotation points. Audi of America called me this morning and in the discussion said because it has not thrown up a fault code for the sensor does not mean the contacts are dirty and need to be clean.. usually throws fault code if in fact the part has failed.

Glad it has started and narrowed down!


Sadly, this did not work for long. Car sat in garage over weekend and then fired up first crank.. I re-parked the car in the garage bc I wanted to check wires on the crankshaft speed sensor. 2 mins later I tried to restart (no sound of fuel pump priming this time) and same thing, just cranks and cranks but not firing up. I then tried the compression bump like worked once before and no go. So, again, baffled and not sure what is the problem.. now i'm thinking it's the fuel pump because I'm not getting any codes for sensors and such.. and I hear the Audi will not throw a code if the fuel pump is dying or going goes out.

I've tried different keys, steering lock, jiggling ignition with key in, shifting a bit, clutch peddle.. in case of maybe a short.. with the key in it says the usual "press clutch to start"..

*sigh, this is getting old

[pinot007]

Ok, a new update as it looks like people are viewing my page of misery. Last evening I installed a new CamShaft (Hall) sensor (btw very easy to do) and still no starting. After this I decided it's down to a few things, the Crankshaft speed sensor or the fuel pump. I took the fuel pump out, cleaned the contacts and put it back it. The TT fired up on the 2nd crank. It ran a bit rich for a bit but after leaving the key in the ignition on the on position for 5 mins I think it helped reset the computer & throttle body and drove it around with it running perfect. Idles just fine as it always has and even seems to have better response.

Ok, so with that, it was either a bad fuel pump connection or the fuel pump is on it's way out. I think I'll order a new fuel pump and install soon.

The other thing which i have noted before is it's not throwing any codes for sensors.. which the Audi guy said it's very rare that it will not do this.. and the one fault with this year as far as codes, if the fuel pump is going out or bad, it will NOT throw a code for this.

So...that's the latest.

[129CBRider]

Crank position sensor up behind the oil filter...mine did similar weird start, no-start things @ 120K miles.
Cheap fix but hard to get to, took me an hour on ramps in my driveway.
30 minutes to get to it, 5 minutes to change it out, 25 minutes to put everything else back in place.
Worth it for the peace of mind.
Make sure you get the sensor with the correct length wire harness on it, there are two lengths depending on motor.

[pinot007]

Crank position sensor up behind the oil filter...mine did similar weird start, no-start things @ 120K miles.
Cheap fix but hard to get to, took me an hour on ramps in my driveway.
30 minutes to get to it, 5 minutes to change it out, 25 minutes to put everything else back in place.
Worth it for the peace of mind.
Make sure you get the sensor with the correct length wire harness on it, there are two lengths depending on motor.

Hey 129CBRIDER, that's for the reply. After pulling out the fuel pump a few weeks ago it's been starting/running just fine until this am, no start, same thing. Question for you, did you get any codes thrown for that crankshaft speed sensor?

I'm getting no codes so ppl say it's the fuel pump.. GAH!

[GuidoTT]

Mine will not start but vag says crash mode active


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[pinot007]

Ok lads, after much troubleshooting and months of trying to figure out why the TT was not starting.. here was my answer: fuel pump. I bought a new one from ECS Tuning and took me about 15 mins to install.

Whew..

[GuidoTT]

My solution was to remove my wife's escape key from my keychain


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[BennTT]

Pinot...how is the tt since the new fuel pump? I've got same problem on same model...been to garage twice ....never gets fuel pump error code only the crankshaft ones....but problem keeps coming back. Love to know if all is still good with yours. Cheers, Benn

[pinot007]

Benn, yes, the fuel pump was the issue and I've never had the problem since. BTW the fuel pump will not throw an error code, so yup, you won't ever see one. I ordered the pump from ECS and installed in 15 mins..very easy under rear seat and easy access to it. Dealer and other shops wanted $750-$1000 for new pump and installation.

It really was tricky to diagnose bc it would very intermittently have the problem, so I always thought it was electrical. When I dropped off at shop it started every time they started it, when I picked up the TT, drove a day or 4 then it would happen. Now I know after much headaches.. Good luck mate, let me know how it goes.

Pinot

[lQUOTE=BennTT;11354124]Pinot...how is the tt since the new fuel pump? I've got same problem on same model...been to garage twice ....never gets fuel pump error code only the crankshaft ones....but problem keeps coming back. Love to know if all is still good with yours. Cheers, Benn[/QUOTE]

[BennTT]

Pinot, thanks for your help with this. Will get one ordered....do you know the part number....is it a high pressure pump or low pressure pump? Guy at garage said sometimes there are 2...one for fuel tank and one by the engine.....? Anyway, thanks for taking the time to reply....I love this car but it is costing a few $$ at the moment due to age a mileage....new clutch, steering rack etc etc

[SimbadCA]

Pinot--Presently driving my A4 and looking into a 2002 TT. Your storyline was encouraging with a happy ending.