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Subject Topic: exhaust soot covering front of caravan
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PersonBadBoyBushy
02/3/2014 at 9:31pm
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One of the following almost certainly applies to your car.
1. As suggested above DPF removed
2. Exhaust circulation valves disabled
3. Poor servicing
4. Car needs a good long run as it has only been used around town

My bet is No.4.
Although you don't specify the age of the vehicle, or it's mileage, diesels do not like short around town use, and if this is all the previous owner used it for, it probably just needs a good clear out because diesel exhausts do not work properly when cold.
There is some truth is the old story of thrashing the engine occasionally to clear it out.
A car that is only used around town, will collate a lot of soot in the exhaust, and when you are putting the engine under load with your van on the back it has to work harder so will spit any build up out.
Two best ways I've found to clear out the exhaust are
1. Get the engine up to normal operating temperature. Find a road with a 40mph speed limit which is about 1mile long and you are unlikely to have to stop on. Run the car up to 40mph but only use 1st and 2nd gear (or a 50mph road and up to 3rd gear). The idea of this is to run the engine at around 3500rpm for 30 seconds under load.

2. A good motorway run of 20 miles minimum, in 4th gear not 5th.

All diesels will chuck out a little soot, but I've always found that a good blast through of the exhaust pipe every 3000miles is the best way of preventing build up.


PersonChalkie56
03/3/2014 at 2:21am
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I have a Nissan Terrano and had it from new - it has done 100K+ now and always get soot on the van since I had it and its a pain to get off the van. I tried to get a deflector to fit the tailpipe but couldn't find one. I was then told by a couple of garages that if you deflect the exhaust gases as opposed to straight out the tailpipe you risk causing a backdraft which can break your turbo. I have accepted what they have said and not questioned it. But it could be twaddle but sounds believable. Interesting to know what an expert says.   

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PersonColin21
03/3/2014 at 4:52pm
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I am no expert but I have worked in a garage and I have never heard that one about breaking the turbo by deflecting the exhaust downwards. My Volvo V70 2.5 turbo-diesel has a downward deflected exhaust as standard.

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Best Regards,
Colin


PersonChalkie56
04/3/2014 at 8:04pm
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Like I said Colin I am no expert either. But would love to deflect the soot as it is a real pain to remove from the front of the panel.

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Personbobmel
04/3/2014 at 8:17pm
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You can buy these

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Robert (BoB)


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Personclbewi
04/3/2014 at 8:23pm
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Quote: Originally posted by Chalkie56 on 04/3/2014
Like I said Colin I am no expert either. But would love to deflect the soot as it is a real pain to remove from the front of the panel.


I also run a Nissan Terrano it has a deflector fitted on the tail pipe, I've never had a problem, I think your guy at the garage is talking twaddle.

Colin

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Claire and Colin


Persontozz
04/3/2014 at 8:40pm
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maybe a daft idea but you could just clingfilm the front of the caravan and   allso had same problem with a diesel   there is something called egr valve was full of soot taken off and cleaned with petrol totally sorted it

regards Toz

Post last edited on 04/03/2014 20:47:44

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toz


PersonColin21
04/3/2014 at 11:13pm
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Quote: Originally posted by tozz on 04/3/2014
maybe a daft idea but you could just clingfilm the front of the caravan and   allso had same problem with a diesel   there is something called egr valve was full of soot taken off and cleaned with petrol totally sorted it

regards Toz

Post last edited on 04/03/2014 20:47:44


EGR valves can cause such a problem. They do tend to clog up with soot, as I found on my Volvo. It shouldn't be too difficult to clean, but of course it depends on how easy it is to get to and remove. Mine was just a couple of bolts and a small vacuum pipe.

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Colin


Personkirsty12
05/3/2014 at 6:49am
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Quote: Originally posted by Jasonr01 on 02/3/2014
We bought the car knowing that the dpf had been removed before the bombshell about mot failure if removed so dropped a right clanger.
car was of interest because dpf had been removed as wife does a lot of stop start with her job on small journey's.
Goodness knows what I will have to do when due for mot. Car was also remapped at the same time.
car going in the garage to be checked over next week so will see what can be done then
thanks again for the replies, havent found any reflectors for the car as I have sqaure end pipes on so can anyone suggest a manufacturer I can speak with


I just thought I'd mention the fact your insurance more than likely will be invalid without the DPF.I would check with your insurance to be safe. There's a big article about DPF's in this month's car mechanics Magazine, it talks about all the legality's behind removing them.


Personmichell8
05/3/2014 at 8:00am
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Egr valves can be blanked as well. Egr blanking & dpf removal will give you a longer lasting more trouble free engine with improvement in fuel consumption. Not hard to see why, these anti pollution devices stifle the engine & recirculate dirty exhaust gases back into them.

But good point about insurance. What you are doing is modifying car which insurers require to be told about, also possibly(arguably?)the car becomes not road legal as emissions from exhaust pipe will be in excess of manufacturer level set for ved tax. Insurance t&c's state that for valid cover car must be UK road legal.


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PersonChalkie56
05/3/2014 at 7:43pm
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Hi clbewi - If you know where I could get one from to fit my size exhaust

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Personclbewi
05/3/2014 at 8:22pm
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Quote: Originally posted by Chalkie56 on 05/3/2014
Hi clbewi - If you know where I could get one from to fit my size exhaust


I got mine from the local car spares shop, but if you look on E-Bay there are loads on there . I can't remember the diameter of the pipe off the top of my head but have a measure they are about :)

Colin

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Claire and Colin


PersonChalkie56
08/3/2014 at 9:19pm
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Hi clbewi - I have looked on a few websites and cant find one to suit a 58mm external pipe size. Well that the best I could lie down and measure it.

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PersonGrampian91
08/3/2014 at 11:11pm
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Several exhaust places around Walsall will make you the pipes you need.

Maybe cheaper than buying off the shelf parts that may not fit well.

Whether you get the tips changed or just sleeves to slip over when towing. They can make you what you need.

My exhaust has a downward sweep. Backdraft and kill the turbo? I wouldnt let that person near my car.


Personclbewi
09/3/2014 at 6:23pm
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Here

This is what I have got works well.
Colin

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Claire and Colin


PersonChalkie56
12/3/2014 at 8:05pm
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clbewi - thanks for that Grampian I will have a mooch.

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