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Jimmy over fuelling. Cat gets red hot. Car runs fine until hot
06 Jun 2025 08:06 - 06 Jun 2025 08:07 #260774
by facade
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
Replied by facade on topic Jimmy over fuelling. Cat gets red hot. Car runs fine until hot
If you just want to fire the parts cannon at it, try the pre-cat oxygen sensor. (The one on the exhaust manifold)
During warm up the engine is running on a pre set map, then when hot it tries to balance the fuelling with the reading from that sensor.
They often go bad and cause overfuelling issues (which fail MOT on emissions as well as drop the MPG, but it is gradual so you don't notice), the EML won't come on until it can't get what it thinks is a sensible reading off that sensor and runs out of fuel trim trying.
Otherwise you are going to have to start reading stored codes and examining live sensor data.
During warm up the engine is running on a pre set map, then when hot it tries to balance the fuelling with the reading from that sensor.
They often go bad and cause overfuelling issues (which fail MOT on emissions as well as drop the MPG, but it is gradual so you don't notice), the EML won't come on until it can't get what it thinks is a sensible reading off that sensor and runs out of fuel trim trying.
Otherwise you are going to have to start reading stored codes and examining live sensor data.
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there
Last edit: 06 Jun 2025 08:07 by facade.
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