I noticed all the great information about the '03 Cavalier misfiring on CNG. I have a similar problem with a 2002 that I just received.
When I first put CNG in it I had a little trouble getting it to start on CNG so I pulled the fuse and forced it to gasoline and re-inserted the fuse and it was able to start on CNG but ran very rough.
I took it for an emissions inspection and it passed on gasoline but FAILED emissions on CNG. CO level was 2% too high.
I drove it on CNG and it seemed to run pretty well until it was supposed to switch to gasoline but it seemed like it didn't switch.
This morning it started on CNG but backfired a couple of times and I couldn't get it to run at any speed above idle on CNG. I pulled the fuse and ran it on gasoline.
I had a spare low-pressure lockout solenoid so I switched that out and filled it with CNG again. This time it still ran rough and after a couple hundred yards of driving it switched to gasoline (CNG was now full). I could restart it on CNG but it kind of surges at idle and when I'm trying to hold a steady speed.
Any ideas?
When I first put CNG in it I had a little trouble getting it to start on CNG so I pulled the fuse and forced it to gasoline and re-inserted the fuse and it was able to start on CNG but ran very rough.
I took it for an emissions inspection and it passed on gasoline but FAILED emissions on CNG. CO level was 2% too high.
I drove it on CNG and it seemed to run pretty well until it was supposed to switch to gasoline but it seemed like it didn't switch.
This morning it started on CNG but backfired a couple of times and I couldn't get it to run at any speed above idle on CNG. I pulled the fuse and ran it on gasoline.
I had a spare low-pressure lockout solenoid so I switched that out and filled it with CNG again. This time it still ran rough and after a couple hundred yards of driving it switched to gasoline (CNG was now full). I could restart it on CNG but it kind of surges at idle and when I'm trying to hold a steady speed.
Any ideas?
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