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Diagnostický případ
Opravené vozidlo
Misfire during acceleration
12.09.2017
| aktualizováno
22.02.2018 15:10:33
4589x
Informace o vozidle
| VIN: | NENÍ |
| Výrobce: | Adler |
| Model: | 3,0 L |
| Rok výroby: | 1934 |
| Kód motoru: | 3U |
| Typ motoru: | 6 3U |
| Výkon (kW): | 44 kW |
| Převodovka: | Manuální |
| Palivo: | Benzín |
| Najeto: | 51 938 km |
Jak se závada projevuje
Nefunguje / funguje nesprávně. Engine misfire during acceleration
Jak často se závada projevuje
- Trvale přítomná závada.
V jakém systému se závada vyskytuje
- Motoru.
- neukládá žádný chybový kód
Doposud provedeno bez úspěchu
Replacement of the distrubutor and carburettor for trial purposes. Test of different sized jets.Závěr
VOZIDLO JSEM NEOPRAVOVALThe repair is only temporary. The diagnostics confirmed that the problem is not caused by the carburettor. The carburettor was adjusted to the highest possible CO2 value as this gives the best - combustion.
Obrázky, fotografie a soubory
Adler 6 3U (7726/1)
6 V vehicle elektrical system
Primary ignition with original coil - defective ignition (7726/2)
Whilst the other sparks have a burn time around 0.7 ms (which is quite short), the defective spark is only 0.1 ms and gives almost no arc. Further we don't know at this point where the arc is occuring. It doesn't even have to be at the spark plug electrodes.
Tail pipe emissions (7726/3)
CO2 was 5.6 % - adjusted to 9.7 %CO was 9.2 % - adjusted to 4.7 - 5.2%
O2 was 6 % - adjusted to about 3.5 %
HC was 1600 ppm - after adjustment dropped to 1200 ppm
Second problem - low quality switching of primary circuit (7726/4)
The primary circuit intermittently opens in one step and also in two steps with different openning periods. This has to be inspected and fixed.
Overview of occurrences (7726/5)
This is how often a low quality spark is present. The engine is bucking slightly at increased idle speed and the sparks are intermittently good while the rest is low quality ignition or misfire.
Current model of Renault 6V ignition coil (7726/6)
Renault uses in series connected ignition coils. So this coil has enough power to give a sufficiently strong spark but is not designed for such long dwell angles of the old style mechanical points distributor. The coil would overheat. Despite this we can see that the problem is the distributor.
Advance and engine compression (7726/7)
The individual cylinder pressures are the same on all cylinders.
New distributor - new setting (7726/8)
The owner brought in a different distributor that had to be installed correctly.The engine started on the first turn of the starter. Advance was adjusted. Now we can see that spark burning time has extended from 0.4 ms to 1.5 - 3.0 ms!
Note: This distributor is not the correct type for this vehicle because the the rotation direction is opposite and thus the centrifugal advance regulation is also opposite to what it should be. Nevertheless this distributor proved that mechanical play in the distributor drive system has no influence on the engine misfire.
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