- Mar 26, 2018
- 2004 alh wagon, 91 golf 1z, 05 golf, 05 passat, 06 jetta
My 2012 cjaa has been progressively starting harder first start of day. I've only had it since January It started instantly in single digit Temps. In April it started hard maybe 10% of mornings, now it's 100%. I get lots of Greyish smoke on first start, extended cranking. It runs fine, starts easy until it sits overnight. Car is deleted, tuned I have no idea whose tune. Only code ever is implausable fuel pressure sensor. Fuel filter and auxiliary pump replaced recently. Good pressure instantly per vcds while cranking,. Fuel pressure instantly drops to 0 when not running. I noticed when I changed out auxiliary pump that Fuel siphoned back into filter like there was no check valve anywhere. Lift pump makes noise, I haven't checked output. Both pumps run with output test, but neither come on with key on accessory position. I thought rail was supposed hold some pressure when off? I did notice that my 4,5,6th gear 1700rpm-2k stumble went away when I replaced auxiliary pump, which makes me wonder if lift pump was starving it? Is there some way to rule out leaky injector before I replace lift pump, fuel pressure regulator, etc?