1985cucv

ok so i have this ticking when the key is on it is pretty fast and constant. i havent noticed it before and am wondering if it is just the injectors bleeding the air off? i have a lift pump failure code and havent noticed it until this code came up in the truck i have a fuel boss so i have a fuel pump just want to know if it is normal and how do i get rid of the lift pump code? thanks

Spooler

It is the vaccum pump. The 03 to 04.5 have vaccum pumps for the cruise control to work. The 05 and up trucks have drive by wire, so vaccum pump is needed.

quicksilvr

Sounds like injectors bleeding air to me, I can hear it on mine after my pump shuts off.

1985cucv

either way neither is an issue right?

quicksilvr

Nope!

no_6_oh_no

Injectors #1 and #6 will cycle when the ignition is in the run position and no engine rpm's detected. They are bleeding rail pressure and any possible air out of the rail preparing to start. Perfectly normal operation.

AH64ID

I always figured it was something like that.. Thanks.

1985cucv

awesome got me a little nervous these trucks i tell ya make some weird noises

SuperGewl

It could also be the Grid Heater Relays cycleing. Does it go away after about 3 minutes? If it does then its the Grid Heater Relays.