Re: 3 cylinders not working -- 928S4VR Forum

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Date Posted: 16:31:40 07/23/04 Fri
Author: Rich
Author Host/IP: 209.86.16.9
Subject: Re: 3 cylinders not working
In reply to: cooksey 's message, "3 cylinders not working" on 11:49:27 07/22/04 Thu

You didn't say which 3 cylinders don't work. The S4 has two separate ignition circuits that include two coils, two distributors, and two ignition controllers. Most likely you have 1/2 of the spark system not working. The ignition controllers are up front on the left side (as a driver looks out the windscreen) side of the car.

I'd suggest pulling the connectors to the spark controllers and see if they are corroded.

The S4 has a separate spark controller (EZK) unit that is located in the kick panel on the passenger side (LH drive models, I don't know about RH drive models), it is the module located on the inside (towards the centre). This is the unit that controls the spark. If you need the pin-out of the EZK connector to make some checks I can email it to you.

The S4 also has a separate LH fuel injection controller, this one is located to the outside of the car.

There is a chap in Holland, he lives near Venlo. His website is http://home.wxs.nl/~Jennit/Porsche.htm
He may be able to help you find a decent mechanic.

Good luck,
Rich
www.electroninkrepair.com

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>Just bought a car a 87 s4 its been standing for over a
>year. 3 cylinders are not working, Ive had everything
>checked, spark, compression and fuel all is ok.
>Leads, distributer all ok. Could it be ignition
>circuit relay or maybe the ecu? The car is in holland
>and i need to get it to england ive already been stuck
>here for 3weeks so i need to go back asap besides the
>mechanics here are all useless even the ones who claim
>to be experts. Can you help?

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