Check a condition of the case of converter. For check of pollution of internal channels attach the vacuum gage to a 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, in an exhaust system or converter can be pollution.