Fume ingress

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Fume ingress

Post by MartinSS1 » Thu May 23, 2019 8:15 pm

As I type this I am sat on the ferry over to the Isle of Mull, having driven about 500 miles in a car that was a bare chassis 17 days before the MOT, which was less than a week ago! So for the most part it's going well!

I have however been plagued by exhaust fume ingress inside all day.

Is this a common problem? Is there a fix?


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Post by scimjim » Thu May 23, 2019 8:22 pm

Nope, not common - where is it leaking from?

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Fume ingress

Post by MartinSS1 » Thu May 23, 2019 8:33 pm

Humm, odd. Well nowhere that I can see. Just comes in through the windows.

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Post by Dcrosby13 » Thu May 23, 2019 9:06 pm

Might be blowing from the centre section

I break stuff...... :w

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Post by philhoward » Thu May 23, 2019 9:29 pm

Sure it’s not coming up through the gear-lever hole?

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Fume ingress

Post by CNHSS1 » Thu May 23, 2019 10:20 pm

philhoward wrote:
Thu May 23, 2019 9:29 pm
Sure it’s not coming up through the gear-lever hole?
+1 often if the rubber under garter is damaged or omitted, the fumes can get passed the leather garter.
TBH sounds like you have an exhaust leak to fix, as usually its oily smells that get in the cabin rather than exh gas

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Post by cannonball » Thu May 23, 2019 10:21 pm

I know it's not Scimitar but back when I used to run rover sd1's they used to suck exhaust fumes in from the back of the car through the vent holes in the tailgate It was a common problem with them and I was not the only one to experience this so maybe worth checking to see if there is anywhere at the rear end where fumes can be sucked back into the cabin. Just a suggestion.

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Post by reliant-reviver » Thu May 23, 2019 11:41 pm

What air filter you running? Just wondering if you are smelling crank case gases if the car has a free flow air filter and open breather.

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Post by willholderogri » Fri May 24, 2019 6:41 am

Anybody have a good way of checking wether its exhaust gas .Would.a caravan carbon monoxide alarm help ?

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Post by rkclodhopper » Fri May 24, 2019 7:17 am

You need one of these detectors www.flightstore.co.uk/pilot-supplies-c1 ... gL1cPD_BwE
One of the features of the 5/5a that I like is that you can run at whatever speed you like with the windows wide open without getting battered by the wind, but I think doing this causes a slight reduction in air pressure within the car which will draw in air from anywhere it can. I also suggest the gear lever gaiter although Craig's garter gets a far nicer set of google images but less effective!


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Post by Roger Pennington » Fri May 24, 2019 1:04 pm

Agree about the gear lever hole, but another place worth checking is the rubber gaiter on the steering column where it passes through the bulkhead. It should stay in the bulkhead but mine kept sliding down the column (probably gone limp after too much oil vapour :shock: ). I stopped it by putting a tie-wrap round the column (not round the gaiter) - it was just enough to stop it sliding down.


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Post by Alan SS1 » Fri May 24, 2019 1:08 pm

Roger Pennington wrote:
Fri May 24, 2019 1:04 pm
Agree about the gear lever hole,
another vote for gear lever 'vent' :-)

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Fume ingress

Post by MartinSS1 » Sat May 25, 2019 9:17 am

Thanks for all the replies.

I had the roof off yesterday and it still stank! I think half the trouble is the carb isn't happy and it's running rather rich. I suspect float height. Unfortunately I had an issue with the carb before I left and damaged the gasket slightly taking the top off. Had no time to source a replacememt, so had to seal it. So don't really want to have to take it off again until I have a replacement.
Running standard airbox, though I don't think it seals that well. Will double check the rubbers.
If there is an exhaust leak, it's not a substantial one, certainly not one that would cause this strength of smell.

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