daly.88

well lads i have noticed lately that my bug wrx gets very hard to start when its warm like at normal temp when its a cold start in the morning it starts first tip of the key but when it warms its very lazy and nearlly flattens battery is this bad battery or another problem? Going to a charity run at weekend and don't want this pissing me off the hole day any solutions??

Pigman149

iTrader: (1)

Mine does the same thing, could be the temp sensor at fault

STI2.0_Bugeye_Black

My bugeye was the other way around. It doesn't start right away on cold start but once started it starts at first crank, also doesn't start at first crank when left for 1-2 hours. I changed my spark plugs, fuel filter, cleaned MAF, cleaned throttle body, cleaned IACV, it turned out my culprit was the stinkin' fuel pressure regulator. I replaced it, and now all is good. But yours might be a temp sensor or cps.
*update: FPS didn't entirely fixed the problem. Looking at checking my FP and injector O rings.