VW Lupo 1.0 Won't idle

[Tawe]

Hi. I have problem with 2001 VW Lupo 1.0 (AUC Engine Code).


When I start the car cold, its everything okey, car increases rpms a little and then works at approx 700rpm.


Problem is that after 5mins (very little warm up), if I press accelerator pedal and release it, car won't idle, but cuts off. It would idle only if I release pedal very very slowly, and then works at approx 640rpm.
So have very good power, but just won't keep idle when depressing acc pedal.


Things I've already replaced:
- sparks
- plugs
- coil pack
- engine ecu
- coolant temp. sensor
- map sensor
- pre-cat lambda sensor/sonda
- throttle body (also alignment procedure with both vcds and autocom)
- egr valve is closed


There are no fault codes, just one time was showed:
- 16556/P0172 - System Too Rich, Bank 1


In VCDS, group 33, first field value for Additive at idle is ~25%

[Meat-Head]

Weird, but not as weird as my weird friend

1) unbolt exhaust

2) as your have a parts cannon, chuck a crank sensir on it

3) drill 1/8" hole in throttle butterfly

4) check all small rubber pipes are not gunked up and pipes ckear

[dimitar]

System too rich

Fuel trim is -25%

Check fuel pressure
Timing belt
Cloged intake
Cloged exhaust
Get oscope and measure injector pulse width
................etc

[autoden]

Think it is chain on these, and they do jump.

[rideon]

Crystal ball says ... engine damage... check compression

[Tawe]

To update the thread.


I've checked everything that I could, timing was okey, oil filter cap not leaking, no vacuum leak as I checked, also from brake booster seems okey.


One thing that I found is that injectors weren't original, but from 1.8 Audi ?! :/ I placed used from 1.0, but still the same problem.


Also I've seen that head was previously removed, so I returned the car to customer, it wasn't worth money and time that should be spend on it

[Meat-Head]

Cool unless some inbred put bigger injectors in and filled cat with fuel
gets hot and expands

OFF TOPIC:-

i had had a car once, nothing wrong with it, was given new complete echaust
swappex it and went like a rocket

[synkrotronic]

Turn ligths on and blower engine in max,try and see if engine works better,at idle.
Had one here just cleaned throttle butterfly