Re: [doc] Spare Idle ECU

[Nick Tomlinson <nickandkathryntomlinson@xxxxxxxxxxx>]

Hi Dan.
 
Check basics first before condemning 'black boxes'.
Air leaks on o-rings/ inlet manifold, dropped off vacuum hoses, vacuum hoses connected to wrong devices, throttle-switch, fuses in fusebox, wiring to ecu (including the voltage feedback diode to throttle switch), sensor value of thermister (at ecu plug), plugs plugged in, idle-speed motor not stuck open, the air con mode switch is OFF (another vacuum leak possibility) etc. etc.
 
A 'very' Rough guide, with ignition in position 2 you should be able to hear the idle speed control valve 'humm' at a certain pitch, with the throttle open (opening the throttle switch) the 'humm' should be slightly different.
 
Measure twice, fix once!
 
Good luck.
 
NickT.

Daniel Shane <daniel.shane@xxxxxxxxxxxxxx> wrote:
Does anybody have a spare Idle ECU I could borrow to test that mine is
indeed faulty. My car now idles at 3500 RPM and can be a pig to start.

I'm in Lenham in Kent I don't mind coming to collect it or if anybody
fancies a nice county drive I'll buy you a pint in my local.

Or is there a way bypass the ECU. I've tried unplugging the ECU and
starting the car and it does the same, shooting upto 3500 RPM.

Dan Shane
DOC 423
VIN 4754





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