Re: Rough idle and code 51
Well, the definition of code 51 is O2 sensor lean to long. It says engine allowed to run rich, but prevented from running lean. So yeah, it could very well be your O2 sensor took a dump. Let it idle for a little bit, and check your plugs. If they are black and sooty, you are most certainly running rich.
Another thing to check is your ignition. Especially the coil if it's original. I have been fighting several issues on my Scamp for the last two months. I believe I had several issues, but the last one was rough idle, and missing going down the road. A new coil fixed it. I guess my original 35 year old coil was finally giving up...
Just something to check...
Re: Rough idle and code 51
This car has been on the back burner as I’ve been working 6 days a week all year. I threw a new battery in it today and let it run a bit. I want to chase down this issue. Pulled the plugs to re gap them, they are definitely black and sooty. Either it’s running lean and defaulting rich, or I have a bad o2 sensor.
Re: Rough idle and code 51
Definitely check the wiring for the o2, but also check the live data for the map and coolant temperature sensor, as well as the tps.
Tps is a bit of a long shot, but too easy to check to not confirm it's right. The others are the primary sensors determining injector duration.
As always, check out the hoses, etc for leaks /damage.
Good luck! It's come a long way from almost dying in the junk yard!
Mike