TABLE OF CONTENTS If the reported fault is incorrect exhaust emissions the following procedure should be utilised.
Figure 7.24 is typical of the emissions data available.
| Mazda 626 2.0i GX 16 valve | 1996-1997 | |
|---|---|---|
| Adjustment Data (Fuel) | ||
| DESCRIPTION | SETTING | UNITS |
| Carburettor/Injection make | Mazda | |
| Carburettor/Injection type | MPi | |
| Fuel pump pressure | 5.10 0.70 | bar |
| Injection pressure | 1.50 | bar |
| Idle speed | 700 50 | rev/min |
| Raised idle speed | Not applicable | rev/min |
| CO at idle speed | 0.50 maximum | % |
| carbon dioxide at idle speed | 14.50/16.00 | % |
| HC at idle speed | 100 | ppm |
| Oxygen at idle speed | 0.10/0.50 | % |
| Symptom | Possible cause |
|---|---|
| EGR valve sticking | Buildup of carbon |
| High CO and high HC | Rich mixture |
| Low CO and high HC | Misfire |
| Low CO and low or normal HC | Exhaust leak |
