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Fuel and fuel systems Petrol vs Diesel, LPG Conversions, premium fuels, and all that gas

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  #11  
Old 08-04-17
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starjunk starjunk is offline
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Quote:
Originally Posted by Seigried View Post
I had this on my NS. Replaced fuel lines filters maf and map clean fixed mine. Still need to do the in tank filter for piece of mind.

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I'm having a related issue. Not surging as such, but an intermittent flat spot, mostly with engine cold, around 3000rpm. Feels as though it's starved of diesel or missing, but put the foot down and she goes fine and problem disappears. Fuel lines were replaced along with new injectors 2 months ago. Have bought an SCV but not fitted yet, thinking that this problem is not the 'surging' that is normally associated with SCV wear.
Sounds like MAP and MAF clean are the go? When the problem occurs, fuel rail pressure is perfectly stable. Boost pressure also stable. So maybe MAF rather than MAP?
What's the best stuff and procedure to use to clean the MAF? If there a MAF cleaner? Or does one use carby cleaner?
Cheers, StarJunk
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'92 NH GLS LWB 3.0V6 A/T ...sold Please DON'T consider
'06 NP VR-X LWB Turbo Diesel Sports A/T..sold Please consider
'96 NJ GLX LWB Turbo Diesel M/T..sold . Loved that car
'08 NS GLX LWB Turbo Diesel M/T...daily driver. Wake up and Drive!
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  #12  
Old 08-04-17
BBP BBP is offline
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Starjunk,
Get a proper maf cleaner. Carby cleaners are too aggressive. Supercheap have one.

Rob
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  #13  
Old 08-04-17
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starjunk starjunk is offline
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Originally Posted by BBP View Post
Starjunk,
Get a proper maf cleaner. Carby cleaners are too aggressive. Supercheap have one.

Rob
Thanks Rob! Will go out and get some today. :-)
__________________
'92 NH GLS LWB 3.0V6 A/T ...sold Please DON'T consider
'06 NP VR-X LWB Turbo Diesel Sports A/T..sold Please consider
'96 NJ GLX LWB Turbo Diesel M/T..sold . Loved that car
'08 NS GLX LWB Turbo Diesel M/T...daily driver. Wake up and Drive!
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  #14  
Old 22-12-18
craka craka is offline
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Reviving an old post, I know.

It doesn't appear that anyone replied with normal fuel rail pressure at idle.

Been towing a trailer around which I know adds to fuel consumption, but my fuel consumption with towing is up around 17L/100km and has me wondering wether something else is going on.

Had a look with torque pro and my fuel rail pressure at idle is cycling between approximately 4000 and 4500 psi. Is that normal, or within tolerance to bounce between those two figures at idle?
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NS SWB X 3.2DiD - Factory locker, Hella spotties, GME UHF, roof racks otherwise stock as a rock.

Retired: 1991 NH SWB 3.0L V6 5sp Manual, Mickey Thompson ATZs, GME UHF TX3200.
Wanting: Rocksliders, 2" lift, snorkel or perhaps I should wait and purchase a NS swb in 12months time.
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  #15  
Old 23-12-18
erad erad is offline
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I have looked up my W/S manual (Russian CD) and it is complicated.


With engine CW temp @85 to 95 Deg C, transmission in neutral and all lights off, the common rail target pressure is 20 - 35 MPa at idle speed. Press the accelerator slightly and the pressure should increase (the amount would vary according to how hard you press).


The rail pressure sensor will bring up code PO191, 192 or 193 if the rail pressure varies by more than +/- 10 MPa.


4000 psi equals 27.56 MPa and 4500 psi equals 31MPa
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  #16  
Old 23-12-18
craka craka is offline
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Quote:
Originally Posted by erad View Post
I have looked up my W/S manual (Russian CD) and it is complicated.


With engine CW temp @85 to 95 Deg C, transmission in neutral and all lights off, the common rail target pressure is 20 - 35 MPa at idle speed. Press the accelerator slightly and the pressure should increase (the amount would vary according to how hard you press).


The rail pressure sensor will bring up code PO191, 192 or 193 if the rail pressure varies by more than +/- 10 MPa.


4000 psi equals 27.56 MPa and 4500 psi equals 31MPa
Thanks Erad, I couldn't seem to find it in the manual.

Well all seems to be normal than as I'm between those two ranges at idle, and fuel pressure increase as the accelerator is pressed.
__________________
NS SWB X 3.2DiD - Factory locker, Hella spotties, GME UHF, roof racks otherwise stock as a rock.

Retired: 1991 NH SWB 3.0L V6 5sp Manual, Mickey Thompson ATZs, GME UHF TX3200.
Wanting: Rocksliders, 2" lift, snorkel or perhaps I should wait and purchase a NS swb in 12months time.
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  #17  
Old 23-12-18
Seigried Seigried is offline
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My NS idles at ~4500psi.

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