stalling

[atl_chevyrider]

call this a crazy problem but i have been fighting with this 2000 2.2L for about a week now i have tuned it up and changed the fuel filter and fuel pressure regulator. car cranks when it wants to but if i put my foot on the gas it will run but a minute ago i was cleaning my idel control valve and intake i accidentally knocked off the vaccum line to the fuel pressure regulator and the car runs just as smooth and cranks and runs every time. could this be possible to run with no vac to the regulator?and will this cause me to have any future problems. thanks for any input.

[noshun]

Originally Posted by atl_chevyrider

call this a crazy problem but i have been fighting with this 2000 2.2L for about a week now i have tuned it up and changed the fuel filter and fuel pressure regulator. car cranks when it wants to but if i put my foot on the gas it will run but a minute ago i was cleaning my idel control valve and intake i accidentally knocked off the vaccum line to the fuel pressure regulator and the car runs just as smooth and cranks and runs every time. could this be possible to run with no vac to the regulator?and will this cause me to have any future problems. thanks for any input.

the reason you have a vaccuum hose on the regulator is to regulate the fuel pressure. the vacuum pulls on a diaphragm that allows more flow and pressure. if you had driven it without the hoes you would have had trouble accellerating. basically it's there for a reason leave it that way. you problem though. could be fuel pump, could be dirty injectors. Autozone can test the pump for free and the injectors, run a tank of premium and injector cleaner and see if this helps. It could be electrical even. What actually happens, is it that the car stalls when slowing? is it when accelerating? is the car an auto? Check Engine light ever?

[12field]

Originally Posted by noshun

the reason you have a vaccuum hose on the regulator is to regulate the fuel pressure. the vacuum pulls on a diaphragm that allows more flow and pressure. if you had driven it without the hoes you would have had trouble accellerating. basically it's there for a reason leave it that way. you problem though. could be fuel pump, could be dirty injectors. Autozone can test the pump for free and the injectors, run a tank of premium and injector cleaner and see if this helps. It could be electrical even. What actually happens, is it that the car stalls when slowing? is it when accelerating? is the car an auto? Check Engine light ever?

My 1991 stalls while accelerating but it does not look like I have any vacuum hose on fuel regulator. The lines I thought were vacuum have no suction I can feel and no vacuum pump appears to be on my calavier. Do you have any suggestion for me? THANKS!!!

[noshun]

Originally Posted by 12field

My 1991 stalls while accelerating but it does not look like I have any vacuum hose on fuel regulator. The lines I thought were vacuum have no suction I can feel and no vacuum pump appears to be on my calavier. Do you have any suggestion for me? THANKS!!!

the vaccuum comes from the intake not a pump. when the piston moves down in the cylinder on the induction stroke it sucks air in. causing negative pressure in the intake manifold aka a vaccuum and this then runs other things too like the brake booster. your 91? which motor do you have? if you have a single point injection 2.2 then remove all of the intake plastic parts to leave you with a bare thottle body and then run the motor and see what the spray form the injector looks like. it should be consistent, then open the throttle a little and see what happens if it then sprays an uneven pattern then your injector may just be dirty. If you have a 3.1 v6 then your fuel pressure regulator is on the fuel rails that are under the intake plenum (the alu piece with 3.1 multi-port fi) written on it). hesitation in acceleration can be many thing though. It couls ba a bad fuel filter, a weak pump, Spark plugs, ignition wires, coil packs (pretty common) fuel pressure regulator to name most of them, it can even be poor fuel or even condensation forming in the gas tank, the last being pretty rare.

[noshun]

also. don't want to sound patronising but was the motor running when you checked the vac lines? also where was it you pulled them from? if you have a 3.1 the collection of black pipes on top of the intake mainfold wont have any suction if you disconect them but the whole they come from should as that is where those vac lines source their negative pressure