williamhk

Thanks for replies.
I have replaced my cps and ezk relay.
But, the problem still remain.
So, what should I check next?

dr bob

WHAT DOES THE TACH DO WHEN YOU CRANK ON THE STARTER?

If it jumps as you crank, CPS is likely (but not surely) OK, and you should be looking at power and ground connections for the EZK.

worf928

Was there any work done to the car prior to these symptoms?

Did anything 'interesting' occur just prior to these symptoms?

Do you still have no spark? How are you checking for spark?

worf928

What model year is this 928?

williamhk

Thanks for replies , my car is 1989 928 s4.
After I replace the cps and ezk relay, the symptoms are still remain.
The tach does not jump when I crank on the starter.
As far as I know, the ground connection of ezk is a Brown wire. But, can u tell me What is the color of the power wire of ezk?
One thing interesting happened before the symptoms come out. I drove my car to the gas station, and I try to crank my starter after putting some petrol, but it did not start. And, I wait for an hour to get the car started.
There is still no spark, I pull out two HT cable from Bank1 and connect that two cables to two spare spark plug and then earth them, then I crank it, but it is still no spark.

Hilton

Alarm?

williamhk

Maybe it's alarm problem, but how can I check or bypass the alarm? Thanks

Mrmerlin

https://www.google.com/url?sa=t&rct=...x9zTubcq6HHHXA

worf928

What was the condition of the 3-pin plug body - both sides for the CPS?

What was the condition of the engine harness in the valley of the engine where it branches out for the ISV, CPS, and WOT/idle switch?

Does your '89 have the auxiliary CPS that is bolted to the throttle cable console?