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.
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...