1994 Pontiac Grand Prix Q&A
1994 Pontiac Grand Prix Question: Vacuum lines
There is a main vacuum hose that goes from the intake manifold to the brake servo unit, there is always a vacuum hose that goes to the fuel pressure regulator, and there is a vacuum hose that goes to the fuel tank evaporate emissions purge valve. There should be a label under the hood of your cars with emission equipment details and a vacuum hose routing for your car's engine. If not look at Autozones website once you register they give you access to workshop manuals for many popular cars fro free. - patrick mannion
it's the vacume line that if air gets into it it cause it to jerk - Visitor
The upper intake manifold gasket and/or a PCV vacuum lines/hoses can develop vacuum leaks with age. This type of leak can result in a higher that normal...
I was told that I had FPR problems and to pull the vacuum line off of it to see if there was any fuel coming from it. I could see no fuel. What next?
I noticed while checking connections on hoses and other connections that when I moved the vacuum line on the map sensor the RPM's shot up.
Where is the canister purge valve located and how do you replace it?
my 93 grandprix idleing goes up and down like its about to cut off and when i sometimes stop at a stop sign or traffic light too long it will cut off....have to turn it over 2 or 3 times to restart...