ROUGH RUNNING - ZR-1 Net Registry Forums

Pat Cooke · 11-01-2013

Hi
My 1990 ZR1 has a fault which I am trying to identify.
The symptoms are:- it starts from cold and runs perfect, good miles per gallon, etc., when engine has been stopped for 15 mins it starts up running rough and the miles per gallon go down significantly, at tick over the fly wheel starts rattling. When left alone for 45 mins it starts up perfect. I have tried shorting the socket for the diagnostic and no codes appeared, I am thinking it is something to do with the oxygen sensor or a temperature sensor. I would appreciate any help.

11-01-2013	#1
Pat Cooke Join Date: Oct 2013 Location: England Posts: 35	ROUGH RUNNING Hi My 1990 ZR1 has a fault which I am trying to identify. The symptoms are:- it starts from cold and runs perfect, good miles per gallon, etc., when engine has been stopped for 15 mins it starts up running rough and the miles per gallon go down significantly, at tick over the fly wheel starts rattling. When left alone for 45 mins it starts up perfect. I have tried shorting the socket for the diagnostic and no codes appeared, I am thinking it is something to do with the oxygen sensor or a temperature sensor. I would appreciate any help.