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06-01-2019, 21:06   #16
pablo128
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Originally Posted by demanufactured View Post
OP,
To get the smoke opacity down, a good run prior to the test should help.

You havnt stated what make and model of jeep it is.
I'm assuming it's an older vehicle?

If a good run doesn't sort it, I'd be speaking with a diesel mechanic before using any additives.

It's could be down to a faulty fuel pump or bad injectors.
Or simply burning lots of oil too.

Basically roast the engine before bringing it for the test. If it still fails on smoke, get it looked at. But I'd spend nothing first. I wouldn't even put in an additive as it can mask an issue.
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06-01-2019, 21:08   #17
Macdarack
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Rev the stones out of it the day before the test. It's that simple.
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06-01-2019, 21:10   #18
Under His Eye
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It is an 05 Hyundai Santa Fe. 120K km on the clock. It has never given him bother till now. Not burning oil at all.

The auld chap is a very sedate driver so getting him to red line it could be interesting.
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06-01-2019, 21:20   #19
Macdarack
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It is an 05 Hyundai Santa Fe. 120K km on the clock. It has never given him bother till now. Not burning oil at all.

The auld chap is a very sedate driver so getting him to red line it could be interesting.
Sedate driving is the cause of this issue, carbon/sut build up in the exhaust, when the tester revs the stones out of it the carbon gets blown out and it fails.
Grab a hold of the yoke and rev her up, no need for any snake oil diesel treatments.
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06-01-2019, 21:52   #20
demanufactured
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Quote:
Originally Posted by Under His Eye View Post
It is an 05 Hyundai Santa Fe. 120K km on the clock. It has never given him bother till now. Not burning oil at all.

The auld chap is a very sedate driver so getting him to red line it could be interesting.
There's part of the issue then.
It needs to be given a good burst of high revs every now and again.
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06-01-2019, 21:58   #21
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Redline the fcuker and give her a spin with plenty of punishment.up through the gears plenty of revs.knock out the old cobwebs.then a good dose of dipethene or the stp treatment bottles and test it hot.leave her ticking over before it goes in the door
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06-01-2019, 23:45   #22
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Get the thing fixed properly and stop pumping noxious fumes into the atmosphere.

A good shoieing is a proper fix if it's only smoking because it's bone cold, or has filled itself with carbon from dozens of cold runs.





Now if you'll excuse me, I've got some icecaps to melt.
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06-01-2019, 23:55   #23
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Could be my problem.......

I rarely put my bus above 2,000 rpm and delight in getting from A to B with apparently little effort in comparison to the many small petrols which I revved the sh"""t of to get moving at all. That is my problem. I have NCT on next saturday so I will be revving the absolute sh££"455t6te out of the car before that test......
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06-01-2019, 23:56   #24
pablo128
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I rarely put my bus above 2,000 rpm and delight in getting from A to B with apparently little effort in comparison to the many small petrols which I revved the sh"""t of to get moving at all. That is my problem. I have NCT on next saturday so I will be revving the absolute sh££"455t6te out of the car before that test......
Absolutely. It will do it no harm at all.
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07-01-2019, 06:03   #25
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The night before the test, leave it in neutral with the engine running and a block on the accelerator pedal.

Hopefully this will blow your engine.
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07-01-2019, 09:51   #26
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Originally Posted by Under His Eye View Post
It is an 05 Hyundai Santa Fe. 120K km on the clock. It has never given him bother till now. Not burning oil at all.

The auld chap is a very sedate driver so getting him to red line it could be interesting.
My only concern before driving it hard would be if the timing belt is in good shape, if it has one. If it's overdue due to age or mileage I wouldn't risk it. I'm not familiar with these engines though.
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07-01-2019, 09:56   #27
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My only concern before driving it hard would be if the timing belt is in good shape, if it has one. If it's overdue due to age or mileage I wouldn't risk it. I'm not familiar with these engines though.
They have been known to lose timing, fortunately they have finger rockers that should break before there is too much damage done.
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12-01-2019, 20:15   #28
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Passed. No problems. Thanks for the helpful advice.
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12-01-2019, 21:26   #29
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Passed. No problems. Thanks for the helpful advice.
What did you do to get it to pass?

Mine is failing too, I think the test result was 8.something.
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12-01-2019, 21:27   #30
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You must have very little to worry about that you take the time to chastise someone looking for advice.
To be fair, fixing the actual problem is great advice
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