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Blue AWD
03-07-2013, 03:45 PM
Car is a 1998 5 speed quattro 2.8 30v. So the car starts up fairly fine idles, it is idling around 600rpm, a bit low I suspect? Anyways, it idles pretty smoothly but when I rev it in neutral it's sputters for a second then holds whatever rpm I hold it at. When letting off idle dips very low and sometimes stalls out unless I give it some throttle. I have replaced all vacuum lines but it seems like a vacuum issue to me. It tends to backfire if I blip the throttle in neutral as well.

Backstory: bought a car with a blown motor and bought a used motor and swapped it in. Bought it from a reputable shop (force5 in NH) so I trust that it is fine. I checked the timing and all lined up. My thoughts on possible problems are:

Vacuum leak
Coils or plugs or coil pack
Could the throttle cable need adjusting?
Is there some sort of idle control valve? Something of this sort?

Any ideas would be great. Going to VAG it this weekend but just looking for options. Thanks guys.

B52.8L
03-12-2013, 08:19 AM
I am having the exact same problem with my 1996 Audi a4 2.8. I just randomly started acting up like this, i noticed it mid driving.

B5DriverUSA
03-12-2014, 12:16 AM
I have this to when turning and slowing down it will drop to 200rpm if it just let it idle it stalls


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bydand
06-10-2014, 04:02 PM
I know its going back a bit.

Try cleaning throttle body and then the MAF. If you have not had it scanned for codes yet.

both cheap options.

bydand

B5_Avant_Noob
06-16-2014, 08:05 AM
Vagcom it and do a throttle body alignment. I forget the exact procedure but search it its the same procedure in the 2.8s and the 1.8s. My car had the same symptoms and after the TB alignment it purrs like a kitten. It tends to lose its stored value whenever you disconnect the battery, so this could be your cause.. Let us know if this fixes it for you!


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B5DriverUSA
06-26-2014, 11:25 PM
Mine has stopped dropping in rpm and has maintained well


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okar
07-07-2014, 12:03 AM
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Throttle Body Alignment (TBA)

Ross-Tech is not responsible for any damage or problems that may result from following these instructions. They are to be used at your own risk. As always, you should refer to a Factory Repair Manual for your vehicle!

This procedure details how to perform a Throttle Body Alignment (TBA) on many VW/Audi vehicles. This procedure cycles the motorized throttle body through various states (idle, part throttle, WOT) to relearn their positions. Some examples of reasons to perform a TBA:

The vehicle's battery has been disconnected and re-connected
The ECU has been removed and reinstalled
The Throttle Body has been cleaned or removed and reinstalled
The Accelerator Pedal has been removed and reinstalled

In some vehicles, the car will not run correctly, or may not run at all without performing a TBA after one of the above operations. The TBA can be performed on both Drive-By-Wire (DBW or E-gas) as well as Cable-throttle cars as long as there is no Idle Stabilization Valve (ISV). If there is an ISV, then there is no motorized control of the throttle at all. Typically, '96-'99 VW/Audi have motorized Cable-throttle, and '00+ VW/Audi have DBW. Obviously, there are some exceptions. This should be obvious but TDI's do not have throttle bodies.
There are certain test conditions that must be met before doing a TBA:

No DTC's in the Engine Controller
Battery voltage at least 11.5 V
Throttle must be at idling position (keep your foot off the gas pedal)
Throttle body part must not be dirty (carbonized).
Coolant temperature must be between 5 and 95C
If fault codes were cleared cycle the ignition off and back on prior to running Basic Settings.

Contents [hide]
1 Cable-Throttle Engines
2 Drive-by-Wire (DBW) Engines using KW-1281
3 Drive-by-Wire (DBW) Engines using KWP-2000 or CAN
4 Drive-by-Wire (DBW) Engines using KWP-7000 (UDS/ODX)
4.1 Special Notes
5 Video Link
Cable-Throttle Engines

(These are engines with a physical cable between the accelerator and the throttle, but WITHOUT an ISV.)

Turn the key on but do not start the car.
[Select]
[01 - Engine]
[Measuring Blocks - 08]
Enter Group 098 (Note: Some SIMOS or Marelli ECU's use Group 001 such as ADY & AEE engines)

[Go!]
[Switch to basic settings]
Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switch to basic settings. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.

Click the [Switch to Meas. Blocks] button and you're all set.
Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!


Drive-by-Wire (DBW) Engines using KW-1281

(These are engines WITHOUT a physical cable between the accelerator and the throttle. Check to see if the engine speaks KW-1281 by looking in the top left of the Open Controller Screen Some examples of KW-1281 engine controllers are 2000+ Golf/GTI/Jetta/New Beetle/Audi TT 1.8T)

Turn the key on but do not start the car.
[Select]
[01 - Engine]
[Measuring Blocks - 08]
Enter Group 060

[Go!]
[Switch to basic settings]
Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switch to basic settings. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.

[Switch to Meas. Blocks] button and you're all set.
Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!


Drive-by-Wire (DBW) Engines using KWP-2000 or CAN

(These are engines WITHOUT a physical cable between the accelerator and the throttle. Check to see if the engine speaks KWP-2000 or CAN by looking in the top left of the Open Controller Screen. An example of a KWP-2000 engine controller is the 2002+ B6 Audi A4 1.8T. Some examples of CAN engine controllers are the Mk5 Golf 2.0T FSI)

Turn the key on but do not start the car.
[Select]
[01 - Engine]
[Basic Settings - 04]
Group 060
[Go!]
It should say "Basic Settings: OFF" on the top of your screen.

Click [ON/OFF/Next] to turn on Basic Settings.
It should now say "Basic Settings: ON" on the top of your screen. Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switched basic settings on. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.

Click [ON/OFF/Next] to turn off Basic Settings.
It should now say "Basic Settings: OFF" on the top of your screen

Click the [Done, Go Back] button and you're all set.
Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!

If it did not complete, or resulted in Error, see the Special Notes below.

Drive-by-Wire (DBW) Engines using KWP-7000 (UDS/ODX)

Check to see if the engine speaks KWP-2000 or CAN by looking in the top left of the Open Controller Screen. UDS modules do not support conventional Measuring Blocks - 08 so that button will be grayed out. They do not support conventional Adaptation - 10 or Basic Settings - 04 group numbers, so all choices are found in drop-down menus in these modules.

Make sure the coolant is warm. Turn the key on but do not start the car.
[Select]
[01 - Engine]
[Basic Settings - 04]
Chose a variant of Throttle Valve Adaptation from the drop-down list
[Go!] to activate the Basic Settings
After the result of Finished Correctly appears click [Stop]
The TB may cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.

Click the [Done, Go Back] button and you're all set.
Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!

Special Notes
In some engines, before doing a TBA, it may be necessary to cycle the ignition off and back on after clearing faults.
On vehicles that use Cable-Throttle systems, an over adjusted (or sticky) throttle cable can cause the TBA to fail, or symptoms like no CCS (Cruise Control System) operation.
On vehicles that use Cable-Throttle systems the idle may be erratic after the TB has been removed and cleaned, even after a successful TBA. It may be necessary to drive the vehicle normally for a while until the system has re-adapted.
Video Link

Throttlebody.jpg http://www.youtube.com/watch?v=2zrmhDw_v7Y

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