Intercooler blown? 12 plate Navara V9X - Page 2 - Nissan-Navara.net
Questions & Answers (V9X 3.0 V6 Diesel) Got a problem with your 3.0 V6 Navara? Please request help here, hopefully one of us can help.

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post #11 of 40 (permalink) Old 29-05-19, 11:49 AM
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So, impact damage...

From the 1st day I collected my V6, I wrongly believed that there was a missing mesh grille in that open section in front of the intercooler.
Another cost saving for Nissan, then.
I was always tempted to buy a length of stainless mesh and figure a way to fit it (being far cheaper than a ready-made accessory, and more choice of mesh style and grade), but never got round to it, and as I am selling soon, I won't bother. But I am clearly inviting a "sod's law" event!

I would think the sensor is a pressure sensor....

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post #12 of 40 (permalink) Old 29-05-19, 12:03 PM Thread Starter
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Thanks for the reply Steve - yep I think that open section is what has allowed the damage.

I've identified the sensor (boost pressure), then broke it trying to get it out
New replacement ordered off eBay for 20 so not the end of the world.

Last edited by Mike Jones; 29-05-19 at 12:06 PM.
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post #13 of 40 (permalink) Old 29-05-19, 12:35 PM
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I've got a Zunsport grille covering that slot, not cheap, but cheaper than a new intercooler.

Good result to get a repair at a reasonable price.
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post #14 of 40 (permalink) Old 29-05-19, 12:49 PM Thread Starter
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Quote:
Originally Posted by landmannnn View Post
I've got a Zunsport grille covering that slot, not cheap, but cheaper than a new intercooler.

Good result to get a repair at a reasonable price.
Thanks - good call on the Zunsport - I've just ordered one 62 inc delivery. Much better than having a repeat of 2 months limp mode and the time & cost to fix the IC. Thanks!
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post #15 of 40 (permalink) Old 29-05-19, 02:37 PM
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I have fitted a couple of daytime running lights in that grille too, it seems that my truck is invisible to many road users.

Actually I am on my third set of DRLs, the first two sets got hit by stones...
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post #16 of 40 (permalink) Old 29-05-19, 08:36 PM Thread Starter
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The bad news ... the IC is not repairable. The repair man is pricing a re-core for me.
Slightly less bad news is the garage who did the remap can get me a new one for 350 ex vat. They are also adamant that the remap would not increase boost beyond design spec. In fact they said it can't as they don't and can't change max boost parameters.

I'll choose an option tomorrow and hopefully have the Truck back on the road early next week
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post #17 of 40 (permalink) Old 30-05-19, 12:02 AM
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Be wary of a remap that is not changing boost pressure (although where max boost pressure occurs can be altered). This means the peak mass of air entering the engine is unchanged, so the only way of generating more torque is to squirt more fuel in, but this alters the chemistry of how the fuel burns (richer) which will likely lead to more soot. That means more regens and a shorter DPF life....

On a petrol engine where the fuel/air ratio has to be controlled within tight limits, the only way to get significant more power using a remap is to increase boost pressure and fueling commensurately. Diesels don't care about excess fuel (not stoichiometric) but will make more soot...
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The plural of anecdotes is not data. Anecdotes however, are better than hearsay
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post #18 of 40 (permalink) Old 30-05-19, 12:16 AM Thread Starter
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Thanks Steve. I'm almost wishing now that I'd paid Nissan 1300 for a third ERG valve ...
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post #19 of 40 (permalink) Old 30-05-19, 09:25 AM
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That's a lot for an EGR...

I am guessing that there can only be a few reasons why EGRs fail. Obviously the internal stepper motor could fail, but I have not read about this occuring with any owners. Most likely is that they jam up with too much soot from the exhaust gases.... While there is always soot from a diesel, the only reasons I can think of why that may cause excess soot are:
- ovefuelling, or lack of air/boost (rich mixture)
- long-term low temp running, maybe short journeys, lack of hard work, or high-speed travel
- low-ish cetane number fuel - it burns cooler (I use super diesel most of the time and I can tell the difference, not with soot, but with smoothness and response). Typically supermarket fuel is "base spec", no frills...
- poor, old or wrong grade engine oil (DPF's suffer from this, as they need low ash oil, but it may conceivably affect EGRs too)
- badly calibrated temperature and pressure sensors, or dirty MAF, causing ECU to miscalculate fuelling
- worn injectors.
.....etc

Just theorising for fun, here!

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2014 Nav D40 V6
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The plural of anecdotes is not data. Anecdotes however, are better than hearsay

Last edited by freemansteve; 30-05-19 at 09:32 AM.
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post #20 of 40 (permalink) Old 30-05-19, 11:02 AM
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From what I have read it is mostly soot that builds up and blocks the EGR on the V9X. Soot from the exhaust where is is being piped back into the intake.

As FMS says, there could be any amount of reasons for soot particles to be generated, but definitely worth making sure you have low ash oil and adding some injector cleaner in the tank every 6 months or so.
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