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Discussion Starter · #1 ·
Hello Forum members. Looking for some advice on the following: Have had my 2003 Patrol since new. Has now done 207,000kms and have been very happy with it. Recently (last 6-8 months) it has developed a problem with just stopping pulling and losing power gradually whilst towing the van and negotiating hills (slight hills and steeper). This problem has occurred twice and I have not been able to get the vehicle to replicate the symptoms when taking it to the Nissan people, so it has been hard for them to diagnose, notwithstanding that I have described in detail the problem. The vehicle loses power gradually from travelling at a comfortable speed of 80 - 90kpm right down to the low 40's. If I take my foot of the accelerate and reapply it, the revs pick up again but it quickly loses power again. It seems to do this under load but I have been able to get it to do it twice momentarily without towing (but only just discernible) otherwise it runs a treat. Looking at other entries on the forum (but dated 2009) suggestions have been put forward that it could be an overboost? and the EGR being blocked with soot or the turbo vanes stuck with soot. There was mention of the turbo actuator?? I am hoping to get a resolution soon to allow a van trip to WA in mid August. Any advice would be welcome that I can take to the Nissan Tech to overcome this problem. (I haven't as yet discussed the sooting problems with them). Incidentally this problem has only arisen since having a replacement Intercooler installed. Is it possible that when this was installed "soot was dislodged into the turbo? I am not very mechanically minded, my knowledge slows or stops in the 1980,s. Thankyou, DustyM
 

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Y2KGUII ZD Wgn
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Could be coincidental re intercooler (IC), but, I would check all vacuum hoses under the IC as that is a common area of hose damage.
However, your description also touches on possible limp situation when you say power comes back when lifting foot, this can be caused by a few things, one being a failing MAF.
Overboost was a common catch cry of years ago, doesn't really mean that much, the only time 'overboost' is an issue is if boost hits around 27-30psi, this causes limp and for the engine light to come on.
Do you have a boost gauge at all?
 

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Discussion Starter · #3 ·
Thanks geeyuoutoo, Had the IC hoses checked (they were all new when IC was replaced).The Nissan tech had suggested that it might have been a leak in the hoses when it was first playing up but they checked out okay, maybe they can look at them again.. No, no gauge. I will take these ideas MAF, soot etc to the tech in the next day or so and hope they find the problem, DustyM
 

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Y2KGUII ZD Wgn
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Thanks geeyuoutoo, Had the IC hoses checked (they were all new when IC was replaced).The Nissan tech had suggested that it might have been a leak in the hoses when it was first playing up but they checked out okay, maybe they can look at them again.. No, no gauge. I will take these ideas MAF, soot etc to the tech in the next day or so and hope they find the problem, DustyM
Let us know how you get on, it is always good for us to hear of a solution.
 

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Discussion Starter · #5 ·
I'll certainly be putting the results up one way or another. It will hold good for anybody else experiencing the same/similar problems. DustyM
 

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G’day @DustyM I have the same year as you have and sounds very similar to a problem I had years ago. Except if I accelerated too hard for too long I would lose all power and had to pull over and turn the car off and back on again for it to return to normal. After checking everything over it turned out to be the MAF sensor. Talk to Garry at Nizzbits if it is your MAF he’s way cheaper than Nissan dealer. (Don’t forget to check engine codes).
 

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Discussion Starter · #7 ·
G’day @DustyM I have the same year as you have and sounds very similar to a problem I had years ago. Except if I accelerated too hard for too long I would lose all power and had to pull over and turn the car off and back on again for it to return to normal. After checking everything over it turned out to be the MAF sensor. Talk to Garry at Nizzbits if it is your MAF he’s way cheaper than Nissan dealer. (Don’t forget to check engine codes).
Thanks for your input raggq, I am still working on it and this will add another consideration. DustyM
 

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NISSAN PATROL Y61 3.0 Di (ZD30) 09/2000
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MAF sensor is definitely something to look at.
Make sure you have ( and wil get) a Genuine Nissan MAF.
 

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Discussion Starter · #9 ·
MAF sensor is definitely something to look at.
Make sure you have ( and wil get) a Genuine Nissan MAF.
I'll get them to check this out as well. I have been referred to a firm in Adelaide called MTQ (turbo/diesel specialists) by Nissan as they (Nissan) say they do not have the diagnostic equipment to identify the problem (which really only occurs under load towing a van). As I am not greatly mechanically minded I will have to trust in them.(As I previously mentioned, my knowledge stops in the 70's - 80's). It seems from forum comments that what may need to be examined are the EGR valve, the MAF sensor and the Solenoid (as you say). Somewhere along the way someone mentioned a MAP whatever that is? Anyway, thanks for the suggestion, If I get things sorted I will post the results for others to see. DustyM
 

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even if not electrically or mechanically minded, there are lots of things you can learn to do by yourself from reading posts of this forum mate.
And download the technical manuals from the archive.
section EC provides lots of info.
 

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Discussion Starter · #11 ·
Yes, I have been doing a bit of research following comments and suggestions provided. I have certainly found it helpful. Thanks mate.
 
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