terry bailey

Hi members just purchased 928 series 4 auto but on start up she runs at 1100 ish even when she is warm but if I switch her on then off a few times is she ticks over as normal but when I put aliitle throtle say 800- 1000 it's ok but if I give it a bit more she goes back to high idle thanks terry

The Forgotten On

Probably a failing ISV or faulty temperature sensor.

John Speake

Faulty throttle closed switch.

Mrmerlin

worn throttle cable, pedal to throttle quadrant

terry bailey

Hi thanks for reply where do I find this part is it easy fix thanks terry

FredR

The throttle cable has two parts to it, pedal to throttle quadrant and quadrant to butterfly. As Stan says the pedal to quadrant may well be causing a problem.

Suggest initially you try lubricating the cable with a light sewing machine oil. Apply the oil as the cable enters the outer sheath at the quadrant location as someone pumps the throttle to help you. Just add a few drops at a time no need to go bonkers with the stuff. As I remember there is an adjuster where you can add the oil.

If that simple procedure does not solve your problem you then will have to go deeper.

terry bailey

All cables linkages all good where do I look next

SeanR

When you move the throttle off the stop you should hear a click, and it should click as the throttle is let to back to rest, that's the throttle position sensor going in to idle position. Do you hear a click?

terry bailey

Is this noise heard if sat in sear or in engine bay

SeanR

At the drivers side of the car. You can use your fingers to move the throttle.

Mrmerlin

as Sean suggests
NOTE do the throttle click test with the engine off and leaning into the engine bay,
move the throttle quadrant arm a small amount,
you should hear a faint click from the underside of the intake manifold.
Then the smae click when you release the arm.
What was the last thing you fixed

FredR

Terry,

In case it is not clear to you, if the cable is hanging up a little bit then the idle switch contact will not make. Similarly, adjustment of the throttle cable is quite critical in that there is not much in the way of tolerance to bad adjustment. If the adjustment is out even a little bit one finds that either the throttle struggles to close properly or you do not get full opening of the butterfly. When the idle contact triggers there should be a little slack in the cable but not much.

terry bailey

Whenyou look at the cable it has got a bit of slack on it it's not tight which is how it should be I presume and would like to say everybody been so helpful great forum thanks few things to chec k at weekend cheers