My turbo swap was working quite well until the temperatures started falling outside. The thing has never idled well when cold, but now its not idling at all to the point that I have to hold the gas until it gets warm enough to switch off the warm up cycle. Sometimes it just has days when it doesn't want to go and it dies. When this happens, it floods and fouls plugs in the worst way. Even, worse, even after I've de-flooded it by cranking the engine a few times with fuel disconnected, it usually takes out the replacement set of plugs. I've had to resort to oil injection a few times now, and that usually fouls plugs too. Is there something I can do about this? Ignition upgrade, better plugs (I use NGK's now)? Am I de-flooding the wrong way?

BTW, its a s5 turbo street port with no rats nest, but it has a BAC valve. Its premixed too.

 

Check the compression, low compression will cause this.
Also might be your fuel injectors.

 

The rebuild has about 1600 miles on it, I think the compression should be pretty good...
How would it be my injectors?

 

I'm going to bet your problem is compression.
These engines require a long (2000+ miles) and if you've reved the engine hard during that time you've problem damaged an apex seal thus loosing compression.

Also, it could be that the engine hasn't broken in enough (only have 1600 miles) and thus having low compression which would cause flooding.

The injectors could also be leeking, which would cause it to flood.

 

I would know if I damaged an apex seal, right? *seriously scared now* I've boosted it a few times in the past 100 miles, never near redline though. It still runs quite well when warm, it just doesn't like being cold.

 

Check to make sure your injectors are wired correctly and they are grounded properly. My engine flooded terribly for a while until I figured out that I hadn't grounded the injectors correctly. Hasn't flooded since.

-Andrew

 

Has it always had this problem?
Like i said, engines that have not been broken in will flood.