R107 Blue smoke on acceleration - MoT fail?

shakeel

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3 litre 1988 model 109,000 miles just failed it's MoT due to blue smoke on acceleration.

Is there an interim solution to get me through the MoT, like Forte engine oil additive?

I understand that my valve stems may need replacing, and the valve guides.
However I'd prefer to do the job in a couple of months time when I have more cash.

Any ideas most welcome
 

teddycatkin

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Did it only fail the emmission test then ? (Smoke is not an MOT listed failure).
If so then give it a good dose of injector cleaner take it on a good long run to get it nice and hot and run the test again --(remember you only have 10 days for the re-test) it should pass.
 

Alex M Grieve

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3 litre 1988 model 109,000 miles just failed it's MoT due to blue smoke on acceleration.

Is there an interim solution to get me through the MoT, like Forte engine oil additive?

I understand that my valve stems may need replacing, and the valve guides.
However I'd prefer to do the job in a couple of months time when I have more cash.

Any ideas most welcome

It is not uncommon to attribute sophisticated diagnoses to simple problems, and you may well be correct about the valve stems and guides. But it is not a particularly high mileage car. I would be inclined to take it out on the open road and treat it to an "Italian tune up" - let it clear it's lungs.

If the car does not do many miles, or does not get opened out that often, you may well find it will respond to a good blast. I don't think there is any downside to giving it a try.
 

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It is not uncommon to attribute sophisticated diagnoses to simple problems, and you may well be correct about the valve stems and guides. But it is not a particularly high mileage car. I would be inclined to take it out on the open road and treat it to an "Italian tune up" - let it clear it's lungs.

If the car does not do many miles, or does not get opened out that often, you may well find it will respond to a good blast. I don't think there is any downside to giving it a try.

Apart from 3 points if you get caught, :(. Milage or the lack of does not effect valve seals, they just harden with age.
 
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shakeel

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Thanks for that - I'll give both the additive and the Italian de-choke a try tomorrow
 

television

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Smoke on acceleration is ring or bores, smoke after sitting at traffic lights and pulling away is valves
 

Alex Crow

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and let us not forget the possibility of a split diaphram in the gearbox modulator.

do the gearbox changes 'bang' at all?
 

kth286

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on that generation of car it will, as the oil gets into the vacuum pipes and then into engine.
 
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shakeel

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Thanks all, so far have done the italian tune-up and added Wynn's additive to engine oil to reduce smokey emissions. Both have helped a lot, and the exhaust oily smell is far less now than a couple of days ago.

However, I do have a little blue smoke after sitting at traffic lights, as Malcolm mentioned, which suggests valves.
And my gearchanges do bang a bit, as Alexander mentioned. Where and how do I examine a split diaphram in the gearbox modulator? Or can I examine the vacuum tubes you mentioned, and search for oily deposits there?
It seems quite feasible that I could have an engine valve issue and a split diaphragm in my gearbox modulator.
Any idea as to next steps?

Thanks again for your suggestions
 

Alex Crow

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Are you saying a split gear change diaphragm could cause a smoke cloud to be emitted?

yes, and it can give you a serious amount of smoke, think batman or whacky races.
 

Alex Crow

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sorry DM, i did think it odd that you did not!
 

television

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Thanks all, so far have done the italian tune-up and added Wynn's additive to engine oil to reduce smokey emissions. Both have helped a lot, and the exhaust oily smell is far less now than a couple of days ago.

However, I do have a little blue smoke after sitting at traffic lights, as Malcolm mentioned, which suggests valves.
And my gearchanges do bang a bit, as Alexander mentioned. Where and how do I examine a split diaphram in the gearbox modulator? Or can I examine the vacuum tubes you mentioned, and search for oily deposits there?
It seems quite feasible that I could have an engine valve issue and a split diaphragm in my gearbox modulator.
Any idea as to next steps?

Thanks again for your suggestions

m.mycat


There is a parts kit 111 here

m.mycat
 
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shakeel

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Thanks all, the car passed her MoT today.

So, I have the reprieve I wanted before examining valves and gearbox modulator diaphragm.
Thanks everyone for helping me through this one
 


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