Yesterday I installed 780 inj. & a walbro 255 fuel pump. Took it up to a shop because I don't have a lap-top. And we switched over the Inj size. Well the car idled like **** so he messed w/ the fuel a little bit and got it running right. When I went to start it after it sat and cooled off it wouldn't ilde at all, until I let it warm up to operating temp. So basically the car only runs right when it's in closed loop I'm assuming. because it was at operating temp when we tuned it. Any thoughts or tips to correct this.

 

I had the same prob when i installed injectors, then i added about 20% fuel at idle and it fixed it. i can't post a map now but from 500-2000 rpm in the 0-30% load column i added 20% fuel. Little cold start trick i learned. it works, car runs like stock on warm up

 

Same problem here, I have this problem for over a month now, what I do is I just tap the accelerator so that it would cold start at around 1500 rpm for about a minute, once warmed up the idle is great.

The car wont' start up when cold, the rpm's would fall off and the engine stalls, I have to give a little gas so that it could warm up properly.

Any solution to fix this?

 

^??? did you read my post?

 

Thanks Nez I will try this after work.