GTC 404 MOT Emissions

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GTC 404 MOT Emissions

Post by RonH » Fri Aug 16, 2019 9:27 pm

Just looked at the read outs on GTC 404 MOT issued two days ago.
CO 0.24 HC 217 off side and
CO 0.32 HC 75 nearside.
All marked as a pass.
The other comment made during the emissions test and noted on the paperwork is - Engine Oil temperature check: “coolant pipes were hot.”
Any suggestions or thoughts regarding these figures and comments greatly appreciated.
Also I’ve now found when turning the engine off I sometimes have a slight engine stutter/rumble.

The only thing that is different is that I put a couple of gallons of Morrisons petrol in for the short trip to MOT station rather than my usual Shell V power, plus a shot of Millers VSPe.
Will top up with the shell V power and Millers before setting off to Curbs tomorrow.

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GTC 404 MOT Emissions

Post by peter freeman » Sat Aug 17, 2019 8:36 am

Morrison's petrol turned my plugs red. COs are too low I aim for 2.5 the limit being 3.5 - why the comment about coolant pipes - was the engine too hot. I would expect the coolant pipes to get hot - that's what they are for

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GTC 404 MOT Emissions

Post by halfpenny » Sat Aug 17, 2019 9:03 am

The mot tester was simply giving his reason for determining the engine was hot enough to perform the emissions check- I don't think he was indicating a fault.

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GTC 404 MOT Emissions

Post by gtcse8 » Sat Aug 17, 2019 9:11 am

Will`s Middlebridge # 42 failed the emissions test first time, even though its a 2.9 Injection engine. :(

After debating weather to take it for a thrashing to clear the carbon out of the exhaust the tester told me to just turn the engine OFF and let it cool down a bit as the fan was cycling on and off while the rest of the testing was being done.
The car passed easily when checked 30min later. 8)

So heat MUST have some bearing on emissions. :?:

Although in all my years of testing V type engine cars I have Never had Both pipes checked. :!:

Mark Wilson. Garage sale everything must go. :cry:1 SE6b, 1 GTC Shell &1 SE6a shell & a Triumph Daytona. Also on YouTube :wink: lookup V8 Chevy

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GTC 404 MOT Emissions

Post by Dennis Nicholas » Tue Aug 20, 2019 11:11 pm

My last figures. CO 0.06 (YES 0.06) and HC 87. Similar figures for past several years (now at 101,515 miles.)
But then I am running with the late Alan Deans gauzes and use Castrol Valvmaster + (octane boost of + 2. Usually on Shell unleaded 95. cause that is the cheapest, which I get at Trago Mills when going to monthly Noggin in S Devon. Occasionally use the odd supermarket or BP.
Did I also mention that I use SYNIONIC AFMT, at club discount, price, in all oil. :wink:


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1980 GTC Trafalgar Blue, 2010 basic Skoda Yeti (petrol), Austin 7s, Rileys.

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