Mk4 golf slow start no turbo

[dellybeans]

Car slow to start in morning and turbo not kicking in no lights on dash had it read and got this Knock sensor....air flow... second air injection cleared it left garage and straight back to limp mode.

[Dalo Harkin]

So 3 errors
Knock Sensor - this is near the oil filter, pretty difficult to get to but shouldnt take longer than 20 mins to replace, its common for the engine to stall randomly when this is going

Air flow meter (MAF) yours might just need a clean, try unplugging the MAF and seeing if it runs better with it unplugged

and SAI (Secondary Air Injector) this isn't one to really worry about the SAI just pre heats the CAT to stop damage to it, most people have performance exhausts with decat/sports cat so you could go down the route of deleting the SAI if you have a sports cat or de cat

[dellybeans]

Been away for last 2 weeks, car still not right still having problems with it starting and still no turbo any ideas ? Boost leak maf sensor.

[dellybeans]

Replaced the maf sensor seemed to be ok 1st gear 2nd gear then no power again.

[gazareth]

maybe your fuel pumps failing .