Exhaust smell in cabin at startup especially cold start (1 Viewer)

[kurtl42799]

Hi! I have a 2001 LC100 with about 165k. 5-10 seconds after start up, especially when the vehicle is cold, I am notice a particularly noxious exhaust smell in the cabin that has a little bit of a diesel exhaust smell (perhaps there is oil pooing in a cylinder as the vehicle sits). It seems to dissipate after another 10-15 seconds. It is not present well driving or idling in place, such as at a stoplight, and the vehicle runs very well (smooth as glass idle at about 600 RPM, reasonable 15-16 MPG and good acceleration). In the recent past, I have also smelt unburnt gasoline when exiting the vehicle 30-60 seconds after startup to close my property's entry gate, but the strong cabin exhaust smell is definitely recent. I suspect the fact that it has been colder out the last couple of weeks (20- 40 F) may play a role, although I have never noticed this issue in past cold seasons. I do have and have had an exhaust manifold leak for many years and rarely have I ever noticed any substantial smell in the cabin. The telltale ticking has only lasted a short while before going away as the manifold warms. Lately, however, I am not noticing the ticking as much on startup.

Does anyone have any thoughts or experienced something similar? Is there anything specific I should check that might help narrow the culprit down?

 

[nissanh]

Do you have a leaky exhaust manifold? Do you have fresh air mode on? Is the wind traveling from rear or the car to front?

 

[chtvolks]

Given your situation, it could be related to various factors such as a cold-start enrichment, exhaust manifold leak, or possibly issues with combustion. Checking the exhaust system, including the manifold and catalytic converter, may be a good start

 

[Trapper50cal]

I get a little gas smell on very cold start....never thought much of it.

 

[TLCJC]

Charcoal canister needs replacement?