Hi
we too have a C4 which over the last few years has always taken a while for the booster pump to complete its job after starting. always a quite noisy whirring followed by some beeps and then the lights extinguish and we're good to go...err stop :roll:
anyway, after the car being off the road for several months this year to have a 993 C4 manual gearbox, front diff, bilsteins, RS SSK, remap, leads, dist caps, tinware refurb etc etc, the car ran perfectly on the way home - in fact it was a real joy and the car is totally transformed
we then left it in the garage for a month and the next time we used it, the red lights were up but no whirring noise - and importantly no booster for the brakes! anyway, I swapped both relays R51 (booster pump) and R33 (ABS) and now (touch wood it all seems good
I'm not sure if they both needed changing but figured that neither of them is getting any younger! ( I changed the DME as well for the same reason) the systems seem to be very complicated/interconnected so I wonder if R51 could be connected with your car's problems perhaps?
Just a thought and hope this helps :thumbs:
we too have a C4 which over the last few years has always taken a while for the booster pump to complete its job after starting. always a quite noisy whirring followed by some beeps and then the lights extinguish and we're good to go...err stop :roll:
anyway, after the car being off the road for several months this year to have a 993 C4 manual gearbox, front diff, bilsteins, RS SSK, remap, leads, dist caps, tinware refurb etc etc, the car ran perfectly on the way home - in fact it was a real joy and the car is totally transformed
we then left it in the garage for a month and the next time we used it, the red lights were up but no whirring noise - and importantly no booster for the brakes! anyway, I swapped both relays R51 (booster pump) and R33 (ABS) and now (touch wood it all seems good
I'm not sure if they both needed changing but figured that neither of them is getting any younger! ( I changed the DME as well for the same reason) the systems seem to be very complicated/interconnected so I wonder if R51 could be connected with your car's problems perhaps?
Just a thought and hope this helps :thumbs: