Hi folks

I'm an FNG to this forum so hello everyone...

I know from browsing that a common problem seems to be eratic idle / hesitation on acceleration etc. I have mk2 8v elx and am trying to sort this out. Already got new leads / sparks and cleaned injectors - all help a bit but not completely.

I want to check coils using a multimeter - anyone done this (or knows how)?

Also where the f**k is the ECU on the mk2 ???

Anyone know how to check the idle stepper motor??

You help will be massivley appreciated!
Cheers!!!!

Mick.

Re checking coils with a meter - you can get some figures: say 1.4 to 2 ohms on the primary, can't remember a sensible figure for the secondary ( a few K, most likely)
BUT those tests bear virtually no relation to the actual running condition: something approaching 8 amps through the primary, then somewhere around 300 volts back EMF when the current is broken, not to mention the teens of Kv on the secondary, which will cause breakdown in any substandard insulation.

If you have access to an oscilloscope, and trigger (inductive loop pick-up) it off number 1 spark, and put channel 1 i/p via a 10 to 1 probe on the primary of the coil.
You can tell a lot about the performance of the whole ignition system under real load conditions.
Search hard enough and you will find typical waveforms.

Regarding the stepper motor - on my old Panda, from cold, ignition on (before cranking) the stepper motor will open the butterfly to the position guessed by the ECU, based on ATS and CTS values.
The throttle pedal actally goes down a bit [:0]

Get someone to just turn on the ignition while you head is under the bonnet - you may well see, or hear this happening on your Punto.

Regards

John H


Look here for a start:

http://www.picotech.com/auto/waveforms/primary_ignition.html

welcome to the forum and whats a FNG?