Hello All-
My 2000 Cavalier runs badly on CNG.
With the engine cold, it starts OK on CNG and drives somewhat OK. But when the engine reaches operating temperature, it stalls and can sometimes be restarted. If I can restart it, the car runs badly, and quickly stalls again, acting like the fuel was shut off completely. I pull the CNG fuse at that point. The car will then run very well on gasoline.
Other info: The pressure before the LPR stays around 125 PSI, so I believe the HPR is OK. I rebuilt the LPR, but the symptoms are still the same. When I bought the car last November, it ran fine on CNG. I was unable to refuel the CNG until April, at which time the bad performance started. I have no engine codes.
Any advice is appreciated.
-Paul Reeder
My 2000 Cavalier runs badly on CNG.
With the engine cold, it starts OK on CNG and drives somewhat OK. But when the engine reaches operating temperature, it stalls and can sometimes be restarted. If I can restart it, the car runs badly, and quickly stalls again, acting like the fuel was shut off completely. I pull the CNG fuse at that point. The car will then run very well on gasoline.
Other info: The pressure before the LPR stays around 125 PSI, so I believe the HPR is OK. I rebuilt the LPR, but the symptoms are still the same. When I bought the car last November, it ran fine on CNG. I was unable to refuel the CNG until April, at which time the bad performance started. I have no engine codes.
Any advice is appreciated.
-Paul Reeder
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