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Old May 31st, 2016, 07:09 AM
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John Oberlin
1995 D90 SW
Join Date: Mar 2014
Location: Calgary, AB, Canada
Posts: 33
CO in Cabin

I'm getting carbon monoxide entering the D90 passenger cabin. This is a 300 Tdi that I've had for a couple of months. It was occurring with the hard top on and it's the same now that the soft top is installed. The exhaust system is new and I've had it checked for leaks by two different muffler shops. I discovered a significant improvement by closing off the heater vents with duct tape. This would lead me to think there are two issues: there's some kind of CO blow-by happening under the hood, and the heater is pulling air from the engine bay instead of fresh air from the outside. Any ideas for next steps in troubleshooting?

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Old May 31st, 2016, 08:07 PM
Capt Milks's Avatar
Capt Milks
Status: Offline
Defender V-8, Defender 2.25
Join Date: Oct 2004
Location: United States
Posts: 1,716
normally you get the fresh air from the wing top vent. If you have a loose or missing intake, big plastic thing under the fender top, you could be pulling air from the engine bay. LHD or RHD? Most people have problems with pulling exhaust from a faulty exhaust system or the tail pipe not extending far enough past the side panel.
Land Rover 110
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