Stumped
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Junior Member
Joined: Jan 2009
Posts: 6
Stumped
Have 93 60 Spec. that won't change from open to closed loop causing excess fuel use.
Easiest way to cause change is to run air conditioner. Then, fuel use is proper but upper components of engine change from abnormally cool to very hot. For example, air cleaner is very hot to the touch. It is as though exhaust gas was mixing with the intake air. Could their be a misconnection of EGR or other vacuum lines? Car (when hot and running in closed loop) easily passed emission tests. Recent engine diagnostic tests by well qualified shop showed no engine related codes.
Very anxious to get ideas & help.
Easiest way to cause change is to run air conditioner. Then, fuel use is proper but upper components of engine change from abnormally cool to very hot. For example, air cleaner is very hot to the touch. It is as though exhaust gas was mixing with the intake air. Could their be a misconnection of EGR or other vacuum lines? Car (when hot and running in closed loop) easily passed emission tests. Recent engine diagnostic tests by well qualified shop showed no engine related codes.
Very anxious to get ideas & help.
Tech Certified Members
Joined: Jun 2007
Posts: 2,701
Have 93 60 Spec. that won't change from open to closed loop causing excess fuel use.
Easiest way to cause change is to run air conditioner. Then, fuel use is proper but upper components of engine change from abnormally cool to very hot. For example, air cleaner is very hot to the touch. It is as though exhaust gas was mixing with the intake air. Could their be a misconnection of EGR or other vacuum lines? Car (when hot and running in closed loop) easily passed emission tests. Recent engine diagnostic tests by well qualified shop showed no engine related codes.
Very anxious to get ideas & help.
Easiest way to cause change is to run air conditioner. Then, fuel use is proper but upper components of engine change from abnormally cool to very hot. For example, air cleaner is very hot to the touch. It is as though exhaust gas was mixing with the intake air. Could their be a misconnection of EGR or other vacuum lines? Car (when hot and running in closed loop) easily passed emission tests. Recent engine diagnostic tests by well qualified shop showed no engine related codes.
Very anxious to get ideas & help.
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