Blocked and sticky EGR valves in diesels can cause all sorts of running problems which will vary depending on if your valve is sticky, stuck closed or even stuck open. Problems known to be related to EGR valves include:
- rough idling
- lower mpg
- black smoke from exhaust
On some vehicles the EGR valve is hard to access which can make cleaning a pain. Luckily on the Toyota Yaris D4D 1.4 diesel 2003 it is very easy to remove, this whole job can be completed in 20 minutes or less even for a complete novice mechanic.
- 13mm socket and extender
- Brake or carb cleaner (WD40 is also acceptable)
- Cleaning rag
Remove vacuum hose circled by pulling and then undo the 3 bolts circled. That is it!
Just give it a good spray with your cleaner of choice and then get the rag in there to get all the carbon deposits cleaned out.
Fitting is the reverse of removal, torque the bolts in sequence and be careful not to over-tighten and don't forget the metal gasket.