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YES! Any time you adjust the timing you should disconnect the vacuum advance.
I need a lay out of all the vacuum lines for a 1991 Chevy van.
we need vacuum to remove moisture from tank
Remove the vacuum lines, remove the high pressure and the return hydraulic lines, Use an 18" extension and a 15mm swivel socket with a ratchet to remove the lower bolt holding the assembly to the timing cover from under the truck. Remove the top bolt with a 15mm wrench from above. The entire assembly can now be removed from the truck and further disassembly can be carried out on a bench. You will have to remove the 2 vacuum pumps first. Then drive the gear off the shaft with a bolt that fits the threads on the end of the shaft. Use an air impact gun to drive the bolt in the hole and remove the gear and vacuum pump bearing. Then unbolt the alloy housing from the pump. To reassemble, Bolt the alloy housing onto the new pump. Then use the long bolt supplied with the new pump to drive the bearing and gear onto the new pump. Then install the 2 vacuum pumps and bolt the entire assembly back onto the timing housing. Reattach the hydraulic lines (I would suggest a new high pressure line) using the new o-rings supplied and attach the vacuum lines. Fill with power steering fluid and you are done.
Remove the hydroboost unit from the firewall and replace it with the vacuum assisted booster. If you are careful you may be able to do this without disconnecting the brake lines. You will need new powersteering lines and find a vacuum source for the new booster.
There should be a sticker somewhere under the hood showing a diagram of all the vacuum lines and where they go.
There is no need to remove the timing belt to change the thermostat.
I need a diagram for the vacuum lines on a 2004 Chevy trailblazer
where is the ac vacuum line on a 2000 impala ls> Yes I need to know about a LS
You'll need to take the harmonic balancer off and remove the timing cover to see it. Often you need to remove the timing belt to get it out.
The only vacuum lines you need on the old carb moters is for ur break booster and vacuum advanced distributer
Could be, Accelerator pump in carburetor is not working, (rebuild carb) Timing is off, (adjust timing) Vacuum advance not working, (replace vacuum advance unit) Points are in need of replacing or adjusting,