Fumes..

[n0v0s]

I think fumes are getting through to the inside of my 306.. When i get in the car after a day or so, it smells of exhaust fumes?

Are there any areas that could allow ingression of exhaust fumes? Anywhere under the car/sills?

The obvious would be a leaking exhaust manifold..then fumes getting in through heaters but i've even tried driving around with heaters turned off!

Would like some opinions please that i can check and eliminate. Cheers

[4WayDiablo]

id still put money on a leaky exhaust somewhere

[londondan86]

On my brother in laws old 306, the join between mid section and backbox had perished and exhaust was getting in via the rear wheel arch. Turned out he had a hole about the size of a football under all the plastics!!!

[n0v0s]

He had a hole in the plastics?

I had a massive leak at the midbox/rear box flange too (well what was supposed to be a flange anyway...)

Ripped the box off and welded a pipe in a few weeks bk so it could just be a case of the smoke smell lingering as mine coals like a train and must have gt in from the rear.

I've carried a Carbon monoxide monitor with me, but only after repairing the exhaust so i'm not sure.

The welded pipe is a bodge, its created a sharp angle and the pipe has been hamered in to the mid pipe (only small diameter pipe i had lying around..) would this cause noticeable restriction?

[Toby]

He had a hole in the plastics?

306's can have a habit of rusting the metal in the rear arches, this could allow gases into the cabin as once it's past the shell it can find ways through the plastic trim.

[londondan86]

He had a hole in the plastics?

306's can have a habit of rusting the metal in the rear arches, this could allow gases into the cabin as once it's past the shell it can find ways through the plastic trim.

^This. It wasn't in the plastic itself. The rear arch had no liner so the rain water/salt from the road rusted the metal, it was just hidden by the seats and trim.

[n0v0s]

hock:

I'll have a look! Cheers.

[mark_airey]

IIRC its the 3 doors don't have an arch liner on the passenger rear for some reason and the rusty hole is a common issue with them because of this, what makes it worse is that they normally go around where the rear seat belt bolts to which can't be a good thing, pretty easy fix though if you know someone with a welder and some skillz

[Jenkosowls]

3 Door

to this

to this

Finished


And 5 door



Both my cars and both suffer from it