Idle speed adjustement

[Crook Pin]

My idle is about right according to the tacho (725rpm) but i'd like to raise it a bit cos everything rattles and shakes. According to the on-line terrano manual its done with a plug-in box thingy, having had a half arsed look with a torch, i couldn't see an idle screw. Does it exist? or should i put up with rattling eyeballs and a continual need to push me specs back up me nose?!?!

 

[Adz]

Just wind the bolt clockwise :thumbs

Its just above the throttle cable on the fuel pump below the power steering pump :thumbs

 

[clivvy]

hmm..a tricky one this. I assume yours is the simpler TD model, i.e. no I/C? There fore, it cant by fly by wire pedal, SO, I think the idle screw for your model is in the engine bay, as you look at the car drivers side down near the pump somewhere. Sorry, im not being very helpful but I reckon Peter will be able to find the correct details in the manual, and post here shortly.

onmine, with I/c and fly by wire, well, I cant even figure out how to do it, aprently its a box on the pedal but I cant figure out how to adjust it!

let us know how you get along, I dont think ive ever read a post from someone who has sucessfully adjusted the idle!

 

[briggie]

at your service

http://bebrs.pie-dabas.net/Webs/Terrano/R20/fe.pdf

 

[lacroupade]

hmm..a tricky one this. I assume yours is the simpler TD model, i.e. no I/C? There fore, it cant by fly by wire pedal, SO, I think the idle screw for your model is in the engine bay, as you look at the car drivers side down near the pump somewhere. Sorry, im not being very helpful but I reckon Peter will be able to find the correct details in the manual, and post here shortly.

onmine, with I/c and fly by wire, well, I cant even figure out how to do it, aprently its a box on the pedal but I cant figure out how to adjust it!

let us know how you get along, I dont think ive ever read a post from someone who has sucessfully adjusted the idle!

The answer to both TD and fly-by-wire TDi is here you dingbats....search is your friend, this took me about 17 seconds to find.....:augie

http://www.nissan4x4ownersclub.com/forum/showthread.php?t=4635&highlight=tickover

 

[clivvy]

The answer to both TD and fly-by-wire TDi is here you dingbats....search is your friend, this took me about 17 seconds to find.....:augie

http://www.nissan4x4ownersclub.com/forum/showthread.php?t=4635&highlight=tickover

yeah but ive read this plenty of times, and I cant see how to adjust that little box. you cant get your hand up there with a screw driver, or even a small angled screw driver, to adjust the screws!! Its a right pain in the arse.

if my car passes the MOT saturday, im getting the garage to adjust it for me a little bit, because i get very similar issues too.

 

[lacroupade]

yeah but ive read this plenty of times, and I cant see how to adjust that little box. you cant get your hand up there with a screw driver, or even a small angled screw driver, to adjust the screws!! Its a right pain in the arse.

if my car passes the MOT saturday, im getting the garage to adjust it for me a little bit, because i get very similar issues too.

Have you PM'd Paul?

 

[Adz]

READ THE 2ND POST :doh

TOLD YOU HOW TO DO IT :nenau

 

[clivvy]

Have you PM'd Paul?

no...if he doesnt mind I will though next week, its something id love to get sorted, i just think mine needs minor adjustment...

 

[rayf3262]

The TDi throttle control consists of:

a) the TPS or throttle position sensor.

b) a switch that detects when your foot is NOT applied to the pedal this serves two purposes:

1) if the vehicle is moving it cuts out ALL fuel delivery on overrun thereby saving fuel.

2) if the vehicle is NOT moving (as detected by the VSS) then the ECU will put the engine in idle mode, the idle conditions are COMPLETELY managed by the ECU NOT the throttle position sensor.

You will not be able to adjust the idle speed of a TDi unit by manipulating the TPS.

The TPS adjustment is ONLY there to achieve the required voltage change from nil to full throttle.

If you mess with the throttle stop position such the the "no pedal pressed" switch is incorrect, then yes, the ECU will now be paying attention to the TPS as you would expect, and changing the TPS sensor relative to the throttle will change the engine speed. But it is now, not in IDLE!
This will result in increased fuel consumption on over run as the ECU has no way to determine that you have taken your foot off the gas.

With the price of fuel the way it is I would want to be sure that that particular element of the engine management was working properly.

 

[harlowmaverick]

crook pin dont have a fly by wire!!
i told you how to do it in my original post as re posted by lacroupade :thumb2

 

[11redrex]

pull the idle speed adjuster out a bit when it's cold.

 

[rayf3262]

crook pin dont have a fly by wire!!
i told you how to do it in my original post as re posted by lacroupade :thumb2

I did say TDi...

 

[lacroupade]

I did say TDi...

and an enlightning post it was too - that should stop a lot of head scratching...nice one.:thumb2

So Ray (and Timbo if he's 'on the side'), for the benefit of the huddled masses, any tips on the kinds of things that cause what some might see as low revs - you are right, the 750-800 rpm mark is fine and my trucks have always ticked over very smoothly at that.

But I guess anything from dicky engine mounts onwards could be the root cause of unusual vibration/shaking...

AND BY THE WAY YOU HUDDLED MASSES, THIS IS TDI (FLY-BY-WIRE) SPECIFIC...ALTHOUGH PHYSICAL STUFF LIKE ENGINE MOUNTS WILL CROSS THE GREAT DIVIDE

 

[rayf3262]

and an enlightning post it was too - that should stop a lot of head scratching...nice one.:thumb2

So Ray (and Timbo if he's 'on the side'), for the benefit of the huddled masses, any tips on the kinds of things that cause what some might see as low revs - you are right, the 750-800 rpm mark is fine and my trucks have always ticked over very smoothly at that.

But I guess anything from dicky engine mounts onwards could be the root cause of unusual vibration/shaking...

AND BY THE WAY YOU HUDDLED MASSES, THIS IS TDI (FLY-BY-WIRE) SPECIFIC...ALTHOUGH PHYSICAL STUFF LIKE ENGINE MOUNTS WILL CROSS THE GREAT DIVIDE

EGR - dirty/blocked
throttle body dirty - take it off and give it clean (mine was disgusting!
Intake air leaks after the MAF - check for cracks & leaks etc...
Water in fuel!
any number of things...

Note that when you switch on the air con. the engine revs will pop up by about 100 RPM. There is a control signal to the ECU that is there for this sole purpose. (so if you want your idle speed up, switch on the air con!)
Also when the vehicle moves from rest the engine revs will increase in a similar manner. Watch the tacho when not in gear, when you come to a stop, after ~ 1sec the engine revs will drop by about 100 rpm.

 

[makeitfit]

Ray, I've got the revs dropping about 100 rpm when coming to a halt
I've not been able to notice it at all when moving off, in neutral, just freewheeling:augie
So can I deduce then that the VSS is actually working

 

[rayf3262]

Ray, I've got the revs dropping about 100 rpm when coming to a halt
I've not been able to notice it at all when moving off, in neutral, just freewheeling:augie
So can I deduce then that the VSS is actually working

It does sound as though it could be, but that directly contradicts the ECUtalk showing the speed as zero!
I would double check the speed reading on ECUtalk before diving in much further.

 

[lacroupade]

EGR - dirty/blocked
throttle body dirty - take it off and give it clean (mine was disgusting!
Intake air leaks after the MAF - check for cracks & leaks etc...
Water in fuel!
any number of things...


where does a huddled mass look for this specific item?

 

[rayf3262]

EGR - dirty/blocked
throttle body dirty - take it off and give it clean (mine was disgusting!
Intake air leaks after the MAF - check for cracks & leaks etc...
Water in fuel!
any number of things...


where does a huddled mass look for this specific item?

Just after the I/C... and you may as well give that a muck out while its off too.

 

[lacroupade]

Cheers! :thumb2