Not specific to Volvo but generally how VVT solenoids work. The VVT solenoid uses an electromagnetic coil to move a shaft inside. The shaft opens and closes ports to allow oil to fill or drain from the cam phaser (or vvt hub, the part that changes the timing of the valves without changing physical t...

Often over looked failure of a fuel pump is the fuel filter. They get a bit clogged, the pump has to work harder and burns out faster. Always do them together unless you've replaced it recently.

I tell SWMBO the story of the fuel pump I changed in a BMW with 20k on the clock. "No start, no fuel pressure, amp signature was wacky as all getup. Asked my new lead tech if he knew a secret way to change a fuel pump whitout spilling gas in the car. He said be careful... turns out the best way...

Double check that the fans are doing the same thing under other circumstances first. Drive until the car is warmed up fully then let it idel. The fans should cycle to cool the coolant. If they do the same thing you're on the right track. Although, without looking up the wiring and logic I'm not 100%...

The technical name is petcock. It might help to use that in your search.

Strut mounts are bad. Do you sometimes get a spring sounding twang when you turn?

Clemens wrote: ↑15 May 2019, 13:56
I still doubt the diff is the culprit. Can anyone confirm that you can hear the gears click when changing the tire spinning direction with the wheels off the ground?

Can confirm.

If the pads are the culprit, they will move in the bracket and you should be able to make them click. Without hardware between the pads and brackets, it's possible 20+ years has worn grooves that allows them to click. I wish I was close to you so I could look at it and confirm. Something is making t...

I've seen quite a few cars with hide-a-key boxes somewhere on them at the shop. I guess that's an option for a nonchipped key. One guy had a key zip tied to fuel line, the key was so rusty I doubt it still worked. Another put it on his exhaust and everything was melted together. You could see the ou...

I was always told "use OEM plugs, always. If it came copper use copper, if it came platinum use platinum. Don't use Autolite if it came NGK (or whatever the brands.)" Okay makes sense. Obviously, non stock cars may have other considerations. Now, being one that doesn't take "just bein...