kamtsa

Hi all,

I have an Audi TT quatro coupe 2002 with 175k miles on it (first owner). The car drives very well except for idling issues in the last 2-3 years.

It goes like this, the car idle at normal rpm (750?) but every 3-5 seconds the rpm drops sharply until the point the engine almost stops (it does not) and then it corrects itself by going shortly to 1500 rpm. This repeats for ever. If I press the pedal slightly to 1500 rpm, it stay on this speed with no issue. Also, no issue when driving. I have the idling problem about 70% of the time but could not identify a pattern when they exist.

The car has Revo 'chip' but I had it many years before the idling issues shown up.

Over the years, I told my independent VAG mechanics about it and each time he replaced something (last one was MAF) but the problem returned. At one point he also mentioned a air (vacuums?) leak that he fixed but the problem persisted.

I love the car and it serving me well but I am getting annoyed by the idling problem. Before I get rid of the car I decided to try this forum. Hopefully there are TT gurus here that will help me solve the problem.

I just ran a VAGCOM scan and got the errors listed below.

Thanks,

K.

-------------------------------------------------------------------------------
Address 01: Engine Labels: 06A-906-032-AMU.lbl
Part No: 8N0 906 018 AN
Component: 1.8L R4/5VT G 0004
Coding: 06710
Shop #: WSC 77875

2 Faults Found:
17978 - Engine Start Blocked by Immobilizer
P1570 - 35-10 - - Intermittent
17545 - Fuel Trim: Bank 1 (Add)
P1137 - 35-00 - System too Rich
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 22: AWD Labels: 02D-900-554.lbl
Part No: 02D 900 554 D
Component: HALDEX LSC ECC 0011

1 Fault Found:
00526 - Brake Light Switch-F
27-10 - Implausible Signal - Intermittent

-------------------------------------------------------------------------------
Address 35: Centr. Locks Labels: 8Nx-962-267.lbl
Part No: 8N8 962 267 A
Component: Central Lock/Alarm D06
Coding: 15944
Shop #: WSC 01236

5 Faults Found:
01572 - Alarm triggered by Door Contact Switch; Passenger Side
35-00 - -
01370 - Alarm triggered by Interior Monitoring
35-00 - -
01616 - Signal Wire to Interior Monitor
36-10 - Open Circuit - Intermittent
00956 - Key 2
09-10 - Adaptation Limit Surpassed - Intermittent
00957 - Key 3
09-10 - Adaptation Limit Surpassed - Intermittent

-------------------------------------------------------------------------------
Address 45: Inter. Monitor Labels: 8E0-951-177.lbl
Part No: 8N8 951 177
Component: Innenraumueberw. D09
Coding: 00001
Shop #: WSC 26107
VCID: FCF9BC90ECF0C69

1 Fault Found:
01463 - Alarm triggered by Sensor for anti-theft alarm System
35-00 - -

-------------------------------------------------------------------------------
Address 56: Radio Labels: 8E0-035-1xx-56.lbl
Part No: 4B0 035 186 H
Component: concert II NP2 0007
Coding: 00201
Shop #: WSC 00000

1 Fault Found:
00858 - Connection; Radio ZF Output to Antenna Amplifier
36-00 - Open Circuit