Check a condition of the case of converter. For check of pollution of internal canals attach the vacuum gage to the soaking-up collector (see subsection 3.3.3.). On the heated-up engine check depression idling. Press and release a pedal of an accelerator and again consider depression. Repeat check four times. If depression after the 4th test on 25 мм.рт.ст below than idling, then in the exhaust system or converter there can be pollution.