GU patrol power mood swings

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Originally Posted by threedogs

The vacuum lines are all the small rubber hoses going to turbo actuator and vacuum solenoid just left of air filter box.
should be 3 outlets from memory.
As Yendor mentions contaminates,,,, was the fuel filter dirty when changed,
if running tank right down could be sucking up crud from bottom of tank

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Yup I was aware where they were, and that in some form they trigger the actuator, but just wasn't 100% sure. Not sure on fuel filter, as I didn't ask after nissan replaced it during last service.

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Originally Posted by mudski

Like TD said. Clean the MAF. But if its foobar the cleaner will do jack. What mods have you got besides the zorst? Daes and needle valve? EGR block?
Could be a number of things. A vacuum leak may cause this but a Faulty MAF could too....

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Nothing except the 2.75 beaudesert exhaust. Other than that engine is stock as rock.

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Originally Posted by Clunk

But wouldn't a decrease in back pressure from having a larger diameter exhaust do this?

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Sure would, but why is it intermittent, is what I'm curious about.

There could be a whole range of potential issues here at play. Like I said above, nissan suggested clutch helper is controlled by vaccum and issues with hoses could be the issue, but they didn't have a look. Also, after my exhaust was fitted, I had the car looked at for a potential exhaust or manifold leak, but nothing's come out of that.

I just took the car for a spin just then, for about 15 minutes to grab a pizza, and she absolutely flew... Maybe it likes the dark.

Crisp night air is awesome for driving, you'd swear black and blue it was a different 4x4

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Originally Posted by threedogs

Crisp night air is awesome for driving, you'd swear black and blue it was a different 4x4

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Sure is, over the winter just gone, some morning's it was such an experience driving to work. Plenty of power! But in hindsight, the other warm day we had when it was 25, so warmer than usual, she still behaved the same, plenty of power. And then few hours later, it's as if she retires a few cylnders.

Exhaust wouldn't cause this. If it did, everyone would have this issue I would think. Check the MAF, clean it and judge it from there. But being intermittent it sounds like a MAF issue.

I know exactly what you mean (have a similar thing happen to mine. Except it sort of seems tied to heat - heat soak and a hot afternoon and it's a slug).

But I haven't found why.

All my diesels, including the 4.2, and 3Litre Di's and CRD's have shown this characteristic, and I think it has a lot to do with the amount of moisture in the air....

Mic

how about checking the ic pipes are tight enough I found loose hoses on mine when having seemingly the same problem, also get and ultragauge set that up and see what your boost is doing but I cannot see that it would be overboosting.ps with the ultraguage get the windscreen holder.kev

I recon clean and or test the maf with a multi meter.... Similar prob I had once .... It was the maf .... Cheers

Just cleaned the MAF, and I"m not sure how clean this thing is mean to be but mine isn't looking very pretty by my standards. I sprayed it pretty good and let it dry. Battery still off, so haven't driven it yet.

http://img706.imageshack.us/img706/4294/b79k.jpg
http://imageshack.us/a/img163/5370/oudy.jpg
http://imageshack.us/a/img14/4573/t3tz.jpg

if that is what it looks like after you have cleaned it then that's not good do you have a friend or something whos maf you could try