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Suppliers/Dealers or anyone selling with a commercial view in mind CANNOT post here unless responding to a specific request of a member in a "wanted" post.
Suppliers include people "breaking for spares" on a regular basis, when purchasing spares members should ask a supplier what they contribute to the running of the forum particularly if contacted by a Private Message
Suppliers or Members who have contributed to the forum can be identifed by the logo.
Jimmy over fuelling. Cat gets red hot. Car runs fine until hot
06 Jun 2025 06:55 #260772
by ct
Jimmy over fuelling. Cat gets red hot. Car runs fine until hot was created by ct
Morning all. Need advise. I have a 2009 1.3 jimmy. Which has developed an over fuelling issue. The cat glows red. The car runs fine until it’s hot. Then all of a sudden it starts to stutter and it cuts out. No fault codes at all. Any one had this issue. Information would be gratefully received. Thanks ct
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06 Jun 2025 07:25 - 06 Jun 2025 07:26 #260773
by yakuza
Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
Replied by yakuza on topic Jimmy over fuelling. Cat gets red hot. Car runs fine until hot
Clogged cat so resistance too high?
Spark plugs?
Bad or wrong fuel?
Coils?
Any mods done to it?
These cats are prone to failure as the no 1 disintegrates and the powder and pieces fall down into the no2 cat and constricts.
Spark plugs?
Bad or wrong fuel?
Coils?
Any mods done to it?
These cats are prone to failure as the no 1 disintegrates and the powder and pieces fall down into the no2 cat and constricts.
Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
Last edit: 06 Jun 2025 07:26 by yakuza.
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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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06 Jun 2025 16:03 #260792
by ct
Replied by ct on topic Jimmy over fuelling. Cat gets red hot. Car runs fine until hot
Both cats have been changed. It runs lovely till warm then it starts to misfire and can cut out.
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06 Jun 2025 17:02 #260793
by Lambert
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!
Replied by Lambert on topic Jimmy over fuelling. Cat gets red hot. Car runs fine until hot
If it's heat related it could be the cam sensor?
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!
The following user(s) said Thank You: ct
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06 Jun 2025 18:14 #260794
by ct
Replied by ct on topic Jimmy over fuelling. Cat gets red hot. Car runs fine until hot
No mods at all
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