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March, 15, 2007 AT 8:37 AM

Hi, When I open a window or sunroof in my 94 citroen zx 2.0i petrol, exhaust fumes enter the cabin.

There is no leak in the exhaust. If I keep the windows up, no smell. Turning on blower doesnt cause fumes to enter either.

There seems to be an excess petrol smell from the exhaust when I nose around the rear of the car but nothing under the hood. All dry no obvious leaks.

Other symptoms which might be related are;

-can be hard to start sometimes. Doesnt matter if hot or cold. Turn it over and over and nothing. Turn it off then start again and it fires straight away.
-engine cuts out easily when starting from cold.
-the engine sometimes idles eratically
-sometimes cuts out when approaching a stop. Can start it again immediately
-fuel consumption seems higher than normal (than when I first got the car)

From reading other posts, the injectors or fuel pressure regulator might be an issue. What do you think?

thanks very much.


3 Answers



March, 26, 2007 AT 9:54 AM

I think you may need to replace the oxygen sensors.



March, 26, 2007 AT 6:44 PM

Have one ordered, will reply back with the outcome.



May, 8, 2007 AT 8:11 AM

As it turned out the smell was caused by a leaky fuel filter.

The other symptoms were cleared up by replacing the oxygen (lambda) sensor, map sensor, water temperature sensor, idle control valve (stepper motor) and cleaning throttle housing.

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