Does anyone have experience of a partially blocked oxidation cat on a tdi.
I have several TDI90's.
One of them just makes more noise over 3000rpm and the economy is 45 - 50mpg. The other identical cars all produce a bit more power over 3000rpm (but not a lot) and their economy for similar driving is around 60 - 65mpg.
All cars are serviced well. No sticking handbrakes.
In an effort to improve the economy I have refurbed turbo, new air filter, swapped air mass meters (from other cars), swapped EGR valves and cleaned out intake.
She runs sweetly but just feels a bit strangled.
I was wondering if it could be the oxidation catalyst being partially blocked. Any Idea's how this could be checked or diagnosed? I could swap the cat with another car but that would involve cutting the back box off both cars and I'd rather get some wisdom here first.
I've read on here people getting highly variable economies from their TDI and wonder whether this could be the answer.
Any thoughts / Ideas?
Trevor
I have several TDI90's.
One of them just makes more noise over 3000rpm and the economy is 45 - 50mpg. The other identical cars all produce a bit more power over 3000rpm (but not a lot) and their economy for similar driving is around 60 - 65mpg.
All cars are serviced well. No sticking handbrakes.
In an effort to improve the economy I have refurbed turbo, new air filter, swapped air mass meters (from other cars), swapped EGR valves and cleaned out intake.
She runs sweetly but just feels a bit strangled.
I was wondering if it could be the oxidation catalyst being partially blocked. Any Idea's how this could be checked or diagnosed? I could swap the cat with another car but that would involve cutting the back box off both cars and I'd rather get some wisdom here first.
I've read on here people getting highly variable economies from their TDI and wonder whether this could be the answer.
Any thoughts / Ideas?
Trevor