Hey does anyone with a boosted car have a problem with cold starts like this morning for example about 46 ish degrees?? I went to crank the car over started right away but then stumbled a few times and then shut off.. then I waited a second primed it and cranked it over again and it stated running right away?? but it sounds like it has a miss until the temp gauge warms up and then it drives perfectly fine!? its been doing this only in the morning when it is really cold? so the last few days or so any Ideas? fresh build, fresh tune, fresh plugs and wires.

 

There is a formula with Reliability and Performance somewhere out there. As performance goes up, reliability goes down. I don't own a boosted car but this sounds like a pretty normal problem.

 

haha yeah sounds about right.. Im just new to the whole turbo thing and the car has only done this a few times so I was worried is all.. but I just got off the phone with a friend of mine and he has a similar problem on cold days.. So if any one can give me any other Ideas of what it could be that would be great.

 

Question- Are you running an aftermarket fuel pump?

 

No. Not normal.

 

yes Im running a walbro 255LPH stock lines, Precision 880cc Injectors.

 

This is in a Civic? Better check your logs. Might be your tune.

 

hmm maybe so.. its only cold weather that affects it thats what i dont understand any other day it I crank it over and its fine but when it drops to 30-40 degrees it cranks over right away then stumbles and dies the second time I crank it fires right away and runs fine?

 

my boosted z6 setup does this same thing when its cold and cranks fine when its warmer out.

 

It must be when the car was originally tuned. In the cold my car runs better the colder it gets.

 

ok good! I just got off the phone with my buddy and his boosted gsr does the same thing with this crappy washington weather haha

yeah my car runs great in the cold as well! its just the start up that rough after that the rest of the day its fine?

 

That's usually what happens when an engine isn't getting enough fuel. It's a known fact that gasoline doesn't evaporate as easily when it is cold outside. Boosted setups need fuel delivered faster than non boosted so I am wondering if it is cold fuel or an OEM fuel pump just not able to prime quick enough.

 

Hmmm Im kinda wondering if my walbro fuel pump is getting tired? well according to my AEM wideband the A/F at startup is a little lean it bounces between 15-16.8 and when its warm its aroud 14.3.

 

It's either the pump or the tune.

 

I'm going to put money on the tune. Why? Because when it's extremely hot outside I have the same problem. My car was tuned in cold weather.

 

that would make sense.. it was cold as a wiches tit when I got mine tuned it was on the Octover 27th? so mayby I'll see if it continues to do it, and if so have him richen up maps that startup runs on I guess. well thanks for all the input guys its much appricated