Sorry to be MR THICKO guys but I need to adjust the base idle on my Zed. It is ticking over at about 500RPM. Where is it on the engine and is there a specific proceedure to adjust this. Any help or pics would be great.

 

Cheerz

 

Simon H

Take a lookk at Maciej's site. The tech section covers this well. www.z-car.net

Quickest way Si would be to reset the ECU, disconnect battery for an hour or so! Job done!

Might work, but sounds like the physical adjustment needs doing too. The base tickover is set by gizmos outside the control of the ECU. The ECU does control the tickover, but it can only raise it about the base level - kind of a failsafe really ...

 

[This message has been edited by AndyP (edited 18-10-2001).]

Hi Guyz,

 

This is a fairly simple adjustment, and depowering the ECU will make no difference.

 

This is idle tickover, and set by purely how much the throttle flap is held open when you have your foot off the gaz.

 

From front of car, look at RHS, and to the left of the throttle body you will see a bar which connect the two throttle bodies together. On this you will see a small screw adjustment, which stops the throttle going fully closed. Wind this in with the engine running, and you will here the engine revs increase.

 

Leigh.

Thanks for the help guys, I will have a go at adjusting it when I get home. I am getting pissed off with it nearly stalling when I pull up at junctions.

 

Cheerz

 

Simon H

 

[This message has been edited by simon h (edited 18-10-2001).]

Leigh,

That's the throttle stop rather than the idle adjustment - it may affect the idle, but is not the right way to adjust it. The idle adjuting screw is over the back rhs of the engine (when facing it). Check www.z-car.net for details.

Yep, that's correct, mine had been adjusted to increase the tickover RPM to stop the car from stalling when going into gear.

 

Nelson ran consult and reset the ECU to default settings, this did drop the tickover idle RPM to what it should have been.

 

Resetting the ECU does the same thing.

 

CheerZ

Clean your throttle bodies! Then it'll rev too high! Then reset tickover! Proper job.

Don't touch the throttle stop!!!! This is removing any control the engine has over tick over speed!!! The base idle is the idle revs without the ecu compensating - about 500rpm which feels lumpy as hell. There is a valve on the back of the plenum which is controlled by the ecu to let more air in to up the idle. The ecu should be able to attain about 750rpm easily if the base idle is set correctly.

 

Simon, I think your problem is the solenoid either having a bad connection, gunked up with sludge (have you cleaned the throttle bodies recently?), or just knackered. You need to follow the whole procedure in the links above - ie remove the valve etc etc etc.

 

Just my £50 worth

 

Hope this helpZ,

 

Andy

In the words of Leonardo DaVinchi in Blackadder II...

 

"yahh arree a gaanniuuuusss!"

Cheerz Andy, I identified where it is last night and will have a go at correcting the problem this weekend. I cleaned the throttle bodies a few months back and that did make a differance. This problem of low Idle has only started recently. I think I will clean all the sensor cennections at the same time.

Hours of fun!!!!

 

Seez ya

 

Simon H

Sorry guys

I have got to make a point in letting you

know.

Disconnecting the Ecu for an hour WILL NOT

reset the default in the system .it has none.

All you will do is reset self learn control system. this will NOT effect idle

WILL NOT effect timming

Only close loop mixture ratio feedback elements.....

And it only takes 10 mins to power down the

ecu not 1 hour.

idle control comes from the ecu to the AAC Valve on a duty cycle control system.

Base idle is set to give basic mechanical control. From which the ecu then increases useing the AAC valve theidle to the correct level. it also plays its part in engine idle control on gear changes etc. thats why base idle adjustment is so critical . otherwise stalling takes place or the engine can hold it's revs up when you come to a stop.

 

DAZZ>>>>>>>>>