Hi. I just replaced heads on repo chev. Timing gear ect, The problem is when I start the truck it runs bad rich gas smell ses light blinking. After a few minutes after I get it going it runs perfect no miss or nothing. Let it sit does it all over again. . Could this be valve trouble?

 

More info, carbed, injection, model

 

Sorry 96 vortec.

 

5.7 with 270000

 

Whats the idle rpm when it runs crappy? And ambient temp?

 

Don't have scan tool here it's at work. I haven't got that far. I have to pretty much keep it running or it will die. After it warms up a bit it runs great engine light goes off and it doesn't smell like its rich. It's almost like injectors are leaking just concerned about valve. Thank u,

 

I am thinking intake air temp sensor. I THINK you have a maf sensor, regardless I think since it does this when cold, the IAT sensor isn't sending its signal for the pcm (or whatever) to get the correct fuel/air ratio, in other words it is putting more fuel than it has air because it dosen't know what air flow is comming in. My thought.

 

Ok I will look into that. I just have to get this valve issue out of my head!

 

Just drove it parked it and it seems loaded with fuel. Sat for 1.5 hrs

 

If it was a valve it would run even crappier when warm