Can anyone suggest a mechanic that knows how to fix a DPF problem with a holden captiva? We've had both the turbo and DPF replaced and then the front temp sensor to fix...
Shelly J. replied:
Tommy Turtle
Brian K. replied:
Since there has been quite number of comments on the DPF operation, lets look at what it is. The DPF is there to capture soot particles when diesel fuel is burned, it reduces pollution, nothing else. DPF cleaning is arranged by injecting extra fuel to the engine to burn the captured soot by increasing the exhaust temperature to over 600C. Diesel engine produces more soot if driven short distances with light power thus clogging the DPF quicker, so fair acceleration is better than light footed driving. The DPF is cleaned automatically when the sensors detect that it is starting to clog up. The automatic cleaning cycle (no indicator light on) takes about 15-20 minutes. If the cleaning is interrupted by turning the engine off the cleaning will continue next time you start the engine. If the cleaning can not be completed this way the warning light is lit up and the engine should not be turned off before the light has gone out. The following points are conditions when the DPF light comes on: (The information is from GM Holden website) Automatic Regeneration can fail if one of the following conditions occurs: • Regeneration time exceeds 20 – 25 minutes • The engine is switched off or stalls during the Automatic Regeneration process • The engine is left idling for an extended period (ie. 5 – 15+ minutes) • Temperature at exhaust gas sensors is too high or too low for the Automatic Regeneration process to operate. • Fuel injection quantity is too high or too low for the Automatic Regeneration process to operate • Engine protection function is active (eg. overheating) Driving conditions that will enable the Automatic Regeneration process to occur are: • The engine must be at normal operating temperature. • The vehicle is being driven at speeds greater than 50 km/h. • The engine must be driven at moderate engine loads http://www.holden.co/..wners-info/faqs The website also warns of using incorrect engine oil that can cause the DPF to fail, and that can be expensive. Never use engine oils in diesels that are made for petrol engines. So what can you do if you bought a diesel car and only drive to shops or station that takes 5 minutes? Sell the car and buy a bicycle? Electric car? Small petrol car? It is obvious that a diesel car is not suitable for that kind of use because if the DPF. If you have an older diesel car that does not have a DPF then you should be fine, or could you get someone to remove and disable the DPF all together? Possibly illegal and would void the warranty. So in summary, modern diesels need more than extremely short trips to keep the pollution from our environment. Take the car for a longer trip every now and then, don’t be too careful with the accelerator pedal, “boot it.”