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Old 15-07-18, 12:16 PM   #1
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Default Diesel Engine misfiring/power loss/stuttering/kangarooing

Hi,

I'd really like some help with this if someone can assist, please?

The engine is coughing and spluttering and kangarooing really badly. I replaced the fuel filter and air filter as part of a service last summer and all has been fine since then up until a few weeks ago.

I called my breakdown provider and he put diagnostics and found nothing but suggested that the EGR valve might need cleaning and recommended blanking it off.

So I have cleaned with a specialist aerosol which didn't seem to help much, and then put the blanking plate in which didn't help either.

Has anyone else experienced a similar problem and fixed it?

Thanks.
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Old 15-07-18, 12:21 PM   #2
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Does it happen all the time or does it clear after a while..if not, possibly and injector fault that would show up using diagbox live readings not a generic code reader..
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Old 15-07-18, 12:32 PM   #3
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If 2.0 with Bosch injection check if it has the link harness from rail pressure sensor which drops down behind starter. If there is a harness check it for flaking insulation, its a common issues and causes misfires etc as it short out the sensor on to the block
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Old 15-07-18, 12:49 PM   #4
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Yes, happens all the time.

I don't know what diagnostics the chap had, but would have expected it was a specialist one.
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Old 15-07-18, 12:50 PM   #5
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Quote:
Originally Posted by windy1603 View Post
If 2.0 with Bosch injection check if it has the link harness from rail pressure sensor which drops down behind starter. If there is a harness check it for flaking insulation, its a common issues and causes misfires etc as it short out the sensor on to the block
It's a 1.6HDi.
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Old 15-07-18, 12:53 PM   #6
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Quote:
Originally Posted by windy1603 View Post
If 2.0 with Bosch injection check if it has the link harness from rail pressure sensor which drops down behind starter. If there is a harness check it for flaking insulation, its a common issues and causes misfires etc as it short out the sensor on to the block
Thanks for the suggestion, but I'm not much of a mechanic so don't understand your instructions I'm afraid.
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Old 15-07-18, 01:24 PM   #7
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Quote:
Originally Posted by windy1603 View Post
If 2.0 with Bosch injection check if it has the link harness from rail pressure sensor which drops down behind starter. If there is a harness check it for flaking insulation, its a common issues and causes misfires etc as it short out the sensor on to the block
So, I'm looking for some wiring behind the starter that might have perished insulation which could be causing an arc. Would it be the same on my model, please?
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Old 17-07-18, 10:48 AM   #8
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Ok, so I've tried disconnecting the MAS after a reading about a similar problem on another thread, but no joy. I've tried cleaning the MAS sensor connector.

I've cleaned the battery terminals after a suggestion was made to me: no joy.

One internet suggestion is that it's a faulty injector doesn't seem likely as the engine idles perfectly, and it will drive ok without issue for random lengths of time but will then suddenly jolt and kangaroo violently.

Getting pretty desperate now. Any further ideas?
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Old 17-07-18, 06:39 PM   #9
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I've just noticed that at its worst symptoms the air blower stops too, then comes back on when the kangarooing becomes less violent or stops momentarily.
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Old 17-07-18, 08:40 PM   #10
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That sounds like an electrical fault, if the fan stops the BSI thinks engine has stopped or ign has been switched off. I would check all engine earths and main battery leads then the engine harness where it comes from the engine to body by the gearbox
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