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Nissan Primera P11 eng off when there's humidity

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Astral07 View Drop Down
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    Posted: 05 Sep 2017 at 9:39am
Hi all,

Now i've been writing about this issue before and it has to do with the electronics on the Bosch pump. However, let's try to look at it from another angle.

I've had this issue for 5+ years, however the pump and the engine itself runs PERFECTLY.

Now what happens is that my engine will cutoff only in neutral, NEVER in gear. This is the most likely scenario:

I'm driving a bit faster in 3rd gear (RPM above 2000) and i suddenly need to stop for a red light. I have to time to engine break or to downshift so i just drop off from 3rd gear to neutral. At this point my RPM drops from 2000+ and it should remain on ~700 but instead it just drops to 0 and engine dies.

Now the funny thing is - this ONLY happens when it's cold or humid outside and it can happen on a hot or cold engine, but more likely on a cold one.

So during the Summer, for example this year, i haven't had a single shutdown from May until September, that's 4 full months of perfect operation. As soon as the weather changed, the outside temp dropped and we got a lot of moist in the air, same issue reoccurs.

So i'm asking you now, is it possible that this is NOT caused by my Bosch pump. Is it possible that i have some kind of electrical issue or even some bad sensor that doesn't work correctly?

Let me just say that i have been trying to solve this for past couple of years and so far none of the mechanics were able to change anything. I went to electrical specialists, to Bosch specialists, to official Nissan, to some dingy garages that claimed they know what the issue is, etc. Nothing helped.

Early next year i want to give my beloved Primera to my brother (he will be a new driver) and while it's ok for me after 10+ years of driving a Primera to manage situations like engine cutoff, loosing powersteering etc, i really want to solve this before i hand over the car to him.

Do you see any sensors or something that could cause the issue when it's cold outside and work perfectly while it's Sunny and warm?

Thanks so much, If anyone can help i belive it's you, you know the Primera best.
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Astral07 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Astral07 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2017 at 2:27pm
Can't believe i didn't mention it. The engine is 2.0TD 66kw one.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote right proper charlie Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2017 at 4:11pm
Sounds like a blocked EGR valve. 
theres gold in there hills
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Astral07 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Astral07 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2017 at 4:53pm
External temperature/humidity can influence EGR?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote p11primeragt Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2017 at 8:11pm
Have the maf ever been replaced?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Astral07 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2017 at 7:39am
Not replaced but taken off and cleaned. Not that cheap to replace it so i didn't play hit & miss with it. There are no other symptoms and no CE light for MAF. You still think i should replace it? With a new one or used one? The used one would be ~20 years old so i guess the only way to go is new.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Astral07 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2017 at 8:17am
Hah i just checked a page where they sell used parts and i found a new MAF sensor. The guy bought it for his (now sold) P11 but it didn't fit as it was for Nissan Terrano.

http://www.njuskalo.hr/autoelektrika-elektronika/maf-air-senzor-mjerac-protoka-zraka-mass-air-flow-meter-sensor-0281002-oglas-23118098

He's willing to give it to me for 10 pounds which is amazingly cheap and he says it's same as for a P11 but the connector is different so i would need to cut wires and rejoin it. Should i go for it? Will it work?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote p11primeragt Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2017 at 8:44pm
I've had a faulty maf before but no EML however that was a different car/engine.

As for rewiring one I don't know really, if it's cheap and your sure it would work,then maybe worth a go.I'am not saying it's the answer by any means but worth a bash.
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Astral07 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Astral07 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2017 at 8:53pm
Any other way i can check my MAF? I've already used a multimeter to meassure the voltage and it was fine.

I saw some trick on youtube that shows that the engine should shutdown if i disconnect the MAF harness while it's running. Is it true?

I also remember some other trick with starting the engine without the MAF connected for some short period of time (not sure how long) and if it works fine then the MAF is the problem?

Any advice on those?

I will try to also take off the EGR valve and check it's operation/clean it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote p11primeragt Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2017 at 9:05pm
Again,with the faulty one I had even the voltages was ok when checked but it was sending wrong info to the ECU.

You could try disconnecting the maf while the engine is running,what will happen is that the EML will then come on and the car will run rich.

EGR would be worth cleaning no matter what.
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