I installed A&A P1SC (with all the goodies, 42# inj, racetronix, gauges, etc.), Julio meth injection, and dyno tuned. It is well worth the money and fun as heck. But with the hotter weather, the car does not want to start like it used to.
In hot weather, even with cold start, it starts with very low rpm and stumbles and finally gets up to 1300-1500 rpm then settles down to idle fine. Same thing if its hot and sits for 10 or more minutes. If its hot and I turn it off, then start within 5-10 minutes it starts just fine. (very little cranking, blips up to 1200 or so rpm and goes down to idle)
It idles fine once it gets there, has not stalled at traffic lights or anytime, AC can be on or off and the idle compensates for this just fine.
Did not start like this in the spring when outside temps were 80 and below, only now that it is hot outside.
I have heard rumors about meth injection somehow getting into engine with engine off (my meth injector is almost on top of intake pipe), and that the air path to the engine is now a lot longer and harder to pull air all the way through the S/C, intercooler and all the piping, that this might be the cause. I have opened up the throttle blade a little for starting, but this did not seem to help. If I blip the throttle when it is stumbling on starts, it will rev up too much to 2K rpm, and then come down nicely and everything is fine after that.
Sorry for the long winded post, but I wanted to get as much info for people to read and feedback on.
Any suggestions, I have EVILive, so I can tune.
Robi

 

I have basiclly the same setup and the same problem. First thought was the location of the dual injectors for the meth. Mine are located very low and we thought there could be a syphoning problem. This turned out to not be the case. The car can sit for a week and start-up with no hesitation. But when she is warm, she stumbles. Charley at A&A has tackeled the problem and made some headway.

 

It could still be the methanol even if your nozzle is above the WW tank. I noticed mine would get pressurized if the temperature of the tank changed wildly (from cooler to hotter). The worst I ever saw it was at the track where, after making a cold pass, my tank was so much hotter that methanol actually started streaming out of the windshield wipers.

I drilled out the vent in my wiper fluid cap a little bit more and haven't seen that problem since.

 

Thanks diynoob for the suggestion. I did drill out the cap and install the little vent filter (about 1/4" dia). Next time its hot and I know it will stumble, as soon as I stop the car I will release the windshield tank cap so no pressure can develop and see if it starts OK. If OK, then its off to find a larger vent breather.
Robi