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A8 D2 4.2 difficult start when under the sun

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Old 05-13-2017, 05:28 AM
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Yes sorry, I missed saying the year.
Body is 1996 and Engine 1998. It is an ABZ engine (32 valves)
Old 06-05-2017, 07:50 AM
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Time your 4.2L has a full tune-up?

If the fuel is like the crud here (USA,)
It might not be a bad idea to add your favorite fuel system cleaner and add some octane booster (TK77.) You (most likely) have no idea how the PO drove the car.. putt, putt and all, isn't positive.. pc
Old 06-05-2017, 08:22 AM
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Originally Posted by pocketchange
Time your 4.2L has a full tune-up?

If the fuel is like the crud here (USA,)
It might not be a bad idea to add your favorite fuel system cleaner and add some octane booster (TK77.) You (most likely) have no idea how the PO drove the car.. putt, putt and all, isn't positive.. pc
Hi,

It was the idle switch. Now the car is starting properly.
Regarding Fuel Cleaner, I was thinking about it as fuel quality is not exceptional here... Will check that after I finish the car (central lock, brake pads)
Also, it is difficult to find a correct fuel cleaner brand here. WOuld love to find the Audi one... :/
Old 06-06-2017, 05:21 AM
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where is the idle switch?? never heard of that.


Originally Posted by Mortem76
Hi,

It was the idle switch. Now the car is starting properly.
Regarding Fuel Cleaner, I was thinking about it as fuel quality is not exceptional here... Will check that after I finish the car (central lock, brake pads)
Also, it is difficult to find a correct fuel cleaner brand here. WOuld love to find the Audi one... :/
Old 06-06-2017, 04:18 PM
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Originally Posted by jmmillerfzr
where is the idle switch?? never heard of that.
The Idle Switch is also called the Idle Air Control Valve (Audi #077133455C, Bosch #0280140554).
I is located in the top back of the engine close to the throttle body.
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