Audi TT Spluttering - I'm at a loss - please help

[Harry1972M]

Hi All,
For some time now our 2001 Audi TT 225 has been spluttering and running rough mainly when first started in the mornings, but also bogging down at low revs most of the time - put a diagnostic on it and have so far changed out Spark plugs, all new coilpacks, coolant temperature sensor, Pre cat Lambda - Its still the same !!! I am still getting a code back from the diagnostic tester I am using which is 17861 this is the same code that made me change the pre cat lambda.

Any suggestions.

Thanks in advance

Edited by Harry1972M on Thursday 8th April 18:59

[cuprabob]

MAF?

[Harry1972M]

Been suggested EGT sensor also however I am not sure what or where this is ???

[Autogasm]

A friend had exactly these sysmptons on his and it turned out to be the Mass Air Flow meter. As an aside, it took a while to find as it was one of the first things he replaced from a well known factors and the car was not much better. Eventually fitting a genuine Audi one cured the problem. Hope this helps!

[Tame Technician]

That fault code is for the Exhaust Gas Temp Sensor, so it is more than likely the cause. However the symptoms you have do rather suggest a MAF, and MAF faults never really log a code so the car could need both.

Cant say I've ever seen or done an EGT sensor on a TT, done a few on 2.7Bi turbo cars, EGT sensors are usually threaded into the exhaust housing of the turbo charger.

This is what the 2.7 one looks like.


This could be a TT, not sure, just googled EGT.

[Harry1972M]

Thanks all - where can I get the EGT Sensor from - is it a dealer only part - is there only one on our TT as I keep reading people saying they have two.

Thanks

[Tame Technician]

The bi turbo cars have two, that probably been what your reading.

TT would only have one.

You could try a motor factors, GSF or Euro car parts, but pop into your local Audi centre parts dept get them to look it up and quote you first, then you will have a part number to cross reference.

[Colonial]

I had those issues on my S3 and replaced the MAF and all gone.

Get genuine Audi as the cheap ones can be just as bad.

[Harry1972M]

Thanks Guys - I,ve got a new EGT arriving at the dealership this morning and will be fitting today so will let you know how I get on, I am inclined to agree with you all that although I keep getting the EGT code I think there may be a problem with the MAF also due to the symptoms, I had very similar issues with my previous TVR and it turned out to be MAF - your help & advice is very much appreciated.

Graham

[Harry1972M]

Things have gone from bad to worse !!! I replaced the EGT sensor today and its running like a bag of hammers - misfiring and dying when I put my foot down - any suggestions chaps

[Harry1972M]

It won't run at all now.

[Tame Technician]

Did you do the MAF as well?

Will it run with the MAF unplugged.

Have you desturbed anything when fitting the EGT sensor, like the engine coolant temps sensor or any other connectors.

Edited by Tame Technician on Sunday 11th April 16:29

[Harry1972M]

Hi Tame Tech - I didn't chjange the MAF yet but have just ran the car with it unplugged as you suggested and it runs OK - I have no codes on the scanner either now - so it looks like just what you said - both the EGT and the MAF - I will obtain a new one tomorrow and replace and let you know how it goes.

Many Many Thanks indeed to you and all others for all your help.

Cheers
Graham

Edited by Harry1972M on Sunday 11th April 21:01

[Colonial]

Harry1972M said:

Hi Tame Tech - I didn't chjange the MAF yet but have just ran the car with it unplugged as you suggested and it runs OK - I have no codes on the scanner either now - so it looks like just what you said - both the EGT and the MAF - I will obtain a new one tomorrow and replace and let you know how it goes.

Many Many Thanks indeed to you and all others for all your help.

Cheers
Graham

Edited by Harry1972M on Sunday 11th April 21:01

At least it's a cheap and easy job.

I need to do my O2 sensor after running a dodgy maf for too long so don't hang about.

And time to do my coilpacks. Still, 01 car with 90,000 on the clock and extensive mods so they lasted really damm well.

[Harry1972M]

Got one this morning, fitted in five minutes and all is good.

Cheap in the end, however I have unfornutely chased the problem for some time, so far- new plugs, new coil packs,coolant temp sensor, Lambda number 1, EGT sensor and eventually solved by the MAF.
Kicking myself now but at the end of the day hopefully should be trouble free for a while now.

Once again, can't thank you all enough for your help, in particular Tame Technician.

Cheers
Graham

[Harry1972M]

The car is running much much better now, however its still hunting slightly at idle, considering everything I have changed as listed above - Any Ideas on how to solve this.

Thanks

[Tame Technician]

1.8T Hunting = Throttle body

Cleaning out the throttle body and re doing the basic setting usually works for a bit, but a new throttle body is the usual fix for hunting.

Also check for air leaks. (breather and vacuum hoses hissing.)

[Harry1972M]

Thanks again Tame Technician - It also now cuts out immediately after start up but only sometimes - usually does it 2 or 3 times before running ok (apart from the hunting) do you think the two are connected.

[JB!]

Tame Technician said:

1.8T Hunting = Throttle body

Cleaning out the throttle body and re doing the basic setting usually works for a bit, but a new throttle body is the usual fix for hunting.

Also check for air leaks. (breather and vacuum hoses hissing.)

bks.

mine hunts. :*( whats the damage on a new TB?

[Tame Technician]

Wee this thread, notably the link for the golf forum.

http://www.pistonheads.com/gassing/topic.asp?h=0&a...