928 s4

  • mark.sheffield
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06 May 2025 05:56 #22885 by mark.sheffield
928 s4 was created by mark.sheffield
hi all i have 928 s4 no start 
cranks 
spark to plugs
fule pump running and fuel pressure
ecu good as have running car i swop over 
apears no pulse to injectors 
last autum car started but stored out side over winter 
any ideas
 

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07 May 2025 07:18 #22887 by NickTucker42
Replied by NickTucker42 on topic 928 s4
Sorry for your troubles..

When you say you swapped the ECU, which one did you swap as there are 2 of them.  One is the LH which has a well documented failure mode due to a daughter board cracking over time, and there is the EZK.  LH is for fuel, EZK is for Spark.

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08 May 2025 02:41 #22888 by mark.sheffield
Replied by mark.sheffield on topic 928 s4
thanks for the reply
the lh unit i have spark at plugs not getting fuel

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20 Jul 2025 19:22 #22956 by Rich928
Replied by Rich928 on topic 928 s4
This document may assist you to understand and diagnose your problem. 
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Rich
Membership Chairman
Charter Member
1993 928 GTS Cover Girl
1987 928 S4
1979 928 5-speed rescue
1979 928 5-liter track beast

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