HELP WITH IDLE ??? PROBLEM

[jarc1]

Many thanks.
will have a go at both of these last two suggestions.
Cheers, John

 

[Deleted Member S]

also there is a mini filter on the tdi models its built into the banjo I removed the short steel pipe and blew mine through with carb cleaner and then compressed air

I made a post about mini filters on the TDI's but did'nt get a reply, so thourght they did'nt :roll: To do the job is it the same as the older TD's :?

 

[terranokid]

Deano looked on his and found one so i had a look on mine Its in the same place as the earlier one but its built into the banjo union instead of being inside the pump. The banjo is part of a short length of steel pipe I removed the whole lot it made the job very easy.

 

[Deleted Member S]

Cheers :smile: when I get time I'll pull it apart & have a look, was the filter in the pump or in the metal pipe :? It's just this is my 1st dirty D & have'nt had much to do with them in the past apart from servicing them

 

[jarc1]

Fuel inlet to pump is thoroughly clean, so not to do with the problem.

Have now gone down the track of air getting through to the pump.

Bought a cheapy in line fuel filter and placed on the fuel inlet to the fuel filter. I.E. to see if there was any air coming through from the tank.

Can see a few very small (pin head sized) air bubbles. These are very small and very infrquent. Not certain if even enough to cause a problem.
However for the sake of experimentation, and in desperation, I have mounted the in line filter in such a manner that any air collects at the top of the filter and therefore only fuel feeds on through to the main fuel filter.

It has to be said that this has made a very noticeable difference to the idle problem but has not cured the problem 100%.

The other thing that is now noticeable is that there appears to be a fuel "run" back when the engine is not running for a while. Thus, I imagine causing air to be drawn through when the engine is started.

I am now considering placing a one way valve in the fuel line, to stop the "run back" of fuel when engine is not running.
:?: Can anyone forsee a problem by fitting the one way valve?

:?: Secondly, anyone care to comment about "a minor ammount of air getting through"...does it have to be totally air free.

Have been underneath and attempted to trace the fuel lines to see if I can find any obvious signs of a leak. That proved negative.

:?: Is it possible that the air ingress is at the tank. Is there any kind of seal that maybe slightly leaking?

:?: How difficult a job is it to gain access to the tank. Presumably this will be from inside the vehicle in the boot area, via some form of inspection cover.?

The other option is of course to do nothing and "live with" the slightly annoying problem of the infrequent missing.

Views, opinions etc, would be gratefully received.

Cheers, John

 

[jace]

arent the puegot squeezy primmers one way? could one these from scrappy help?

 

[biffa]

I've read through all your post's,
You mentioned an improvement by fitting an inline filter, I don't know if a one way valve would help,
Fuel feed pipes under the vehicle rot badly on these models that can result in sucking air in,
Access to the tank unit on top of fuel tank should be a round insp cover, Remove tank unit check feed pipe that goes through it
If you could get hold of a vacuum tester like a sealey one, They aren't that expensive, And test each individual pipe incl rubber ones for vacuum drop, Making sure you have blanked off the pipe thoroughly at the other end,
Start from tank unit and work your way through to the pump,
Another trick is to get some thick grease and smear small sections of pipe and joints at a time until you notice an improvement,
Obviously the grease blocks any ingress of air and pin points the culprit,
Failing that you could take a shot in the dark and replace pipes etc that you think could be dodgy,

 

[jarc1]

Hello everyone and welcome back to the same problem.

All what I did before seemed to make a certain ammount of improvement, not perfection but definitely better.

However, some couple of weeks later we appear to be back to square one. I.E. very erratic tickover/missing on idle.

Have removed the additional inline filter and oneway valve, as they were plainly not contributing anything to the equation.

Whilst tinkering this morning I have noticed that by applying the slightest of pressure to the accelerator pedal (I.E. increasing the idle speed/RPM very, very slightly) the erratic idle/tickover seems to disappear totaly, as also it appears does the occaisional missing.

:?: Is it possible that I have missed something very simple and basic (sounds a bit like me..... simple and basic) I.E. is the idle speed too low. Does anyone have information to hand as to what is a recommended idle RPM for this engine?

 

[Guest]

Does anyone have information to hand as to what is a recommended idle RPM for this engine?

What engine?

If you added your vehicle details to your signature then we wouldn't be guessing :roll:

 

[jarc1]

Sorry
2.7 TDi

 

[Guest]

Have a look in this section there maybe something to help: http://www.nissan4x4ownersclub.co.uk/modules.php?name=Forums&file=viewforum&f=102

I also found this on a search http://www.nissan4x4ownersclub.co.u...ms&file=viewtopic&t=4317&highlight=idle+spped