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Discussion Starter #1
Hi people,

I am actually a motor dealer and sold a chap a 2010 Navara D40 DCi 190 D/Cab about 9 months ago that always smoked a little at start up. However it has progressively got worse and now smokes really badly from cold start. This is the situation- As a dealer, often I have found help from people who use these trucks day in, day out. Wondering if anybody has any ideas on the following:

Basically from cold start, it takes approximately 5 seconds to fire and then misses for a few seconds ( up to 30 ). While it is missing, there are plumes of white/blue smoke with what i think is a fuel smell but we are having a debate in the workshop as to whether it is fuel or oil. If you rev the truck the smoke stops quite quickly. After this initial period, the vehicle is absolutely perfect. No smoking when driving, no hiccups, the truck goes absolutely brilliantly.

Before the customer brought it back to us, he replaced the glow plugs and the glow plug relay. The fault does very much seem like a glow plug issue or a leaking injector. There are no fault codes.

It is not under warranty anymore but that is not the point , I would like to just put it right for him.

So when it came in , we checked the glow plugs were getting a feed which they are and that they are powering up. We tried bypassing the egr cooler on this vehicle making sure it wasnt coolant leaking into the engine.The fuel filter was an inferior item which was leaking so a quality fuel filter was replaced. After priming the new filter, it was the best it has started but has since gone back to how it was before. We took the injectors out and sent them for testing at a reputable diesel specialists who confirmed they were all fine. At this point i replaced the scv as these are quite cheap but this made no difference at all.

I buy a lot of Nissans to sell and have an excellent relationship with my local Nissan franchise. They offered to take a look. I told them nothing about what I had done and told them to start afresh. They checked glow plugs ( choice of 2 differing plugs on this model ), relay, turbo seals for leaking, egr, timing chain ( was their initial thought ) before deciding that they felt it seemed like an injector issue. They use a different diesel company to me so i gave them permission. He found a sticking solenoid on one of the injectors but said the others were all fine. This was fixed but when it came to restart it was exactly the same.

Nissan checked some other things and decided that the best course of action would be to remove the head and replace the valve stem oil seals. They had a couple of them that had done this before but with higher mileage than mine (80,000 miles. ). They said did they want us to to do them or them.
I elected to do it in our workshop, replaced headgaskets, valve stem oil seals, etc with quality blueprint ones but as you can guess, it is stil exactly the same.

It starts exactly like a Mondeo TDci 130 with leaking injectors. Has anybody ever came across any similar issues with these before or similar.

I have put a link to a youtube video I have taken of the truck today but it started probably the best it has done. The colder the temperature, the worse it seems to run.

https://youtu.be/6sNkQDiQ5LA
 

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I would want to be 100% sure the fuel filter and possible air leaks are not part of the problem. Have you tried pumping the primer before the cold start?
 

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looks like over fueling to me or fuel is leaking into the bores overnight have you tried the fuel rail pressure?
 

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A lot hangs on whether the initial smell is diesel or engine oil....

Might be a worn piston ring if the smell is oil - it's not unknown for this to be worse with a cold engine, even though you expect to smoke all the time under load. Maybe do a compression test.

Also make sure it's not overfilled with oil, and that engine oil is not leaking from the turbo and ultimately into the intake.
 

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filter

I have the same navara which had the same problem cured by fitting a rather expensive fuel filter The one where the plastic adapter is already fitted
 

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Discussion Starter #8
I am pretty sure its fuel. Did a compression test and even and balanced across all four cylinders.

Checked the turbo and im convinced thats not the fault. No leakage at all.
 

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I am pretty sure its fuel. Did a compression test and even and balanced across all four cylinders.

Checked the turbo and im convinced thats not the fault. No leakage at all.
Have you looked at the guide and done any of the basic stuff advised in there?
 
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