Holley Sniper wont idle (3 Viewers)

[american outlaw]

Are all of the sniper sensors reading reasonable values? My sniper arrived with a dead coolant temp sensor, it was reading a low error. New sensor was 11 bucks. The black plugs suggest that it was running really rich either from a vac leak or bad sensor. Where is your 02 sensor located? Those sensors can also get nuked pretty easily if you are doing multiple rounds of fuel pump priming and short runs of the engine without getting everything up to temp.

The 02 sensor is right under the drivers seat on the exhaust. The Coolant temp sensor was working fine, we compared the readings to a thermal imagine gun. I would like to believe the 02 sensor got nuked cause the sniper could not control the fuel prime. With the prime setting on it would just continuously piss fuel out... so we turned that off.

Also i read that turning the closed loop on (or off, i dont recall) bypasses the 02 sensor and that wouldnt work either.

The engine would idle up until it got to temp, then the sniper would just loose its mind and kill the car with poor idling and backfiring

 

[Grayscale]

Just rings need a full engine overhaul. Valve stem seals can be done with the engine in the truck. I don't really know that this applies in your case, however, these seals are a common failure. Incomplete burning of oil deposits might make a carbon deposit on the spark plugs, but, yes, according to the book, oil deposits should appear shiny, not suit-like.

I'm glad that the carburetor and clean plugs is all that it takes. I say keep it reliable / easier to troubleshoot with the carb.

 

[B y r o n]

Since you were getting air fuel readings the O2 sensor is working. If you reinstall I would set to factory setting and leave it in learning mode. If it is like the Edelbrock EFI it will initially run off stored tables based on engine size and other pre run settings. It won't learn until it warms up. Once learning it will adjust air fuel ratios in the tables to get at the desired ratio.

Good luck!