1987 Buick Century wont stay running?

Question

I Have a New Alternator, Spark plugs and wires, fuel filter and fuel pump....it will start up but it wont stay running what could be the possible problems....i'm ready 2 get rid of it...also b4 it started 2 mess up i would have 2 floor the gas and it will start to move slowly...then when i got 2 like 50mph it will kinda rumble....Whats the Problem..some 1 please help....if u need more info tell me

OK...here is some more specific details...Someone said it could Be the EGR Valve stuck open.....also, when i took it 2 a mechanic they said that it was gettin low fuel pressure 20psi to be exact...I had a new Fuel Pump Put on and also it started to do it...ummm right now when i start it up it runs then quickly stops....could it also be a idle contral thingy or is that the EGR...PLease I need much answers and Possible...lol

and how can the Catalycic Converter Get Clogged...ohh yea it is Fuel Injuected..could it be the Fuel Injectors

YEs its a Multi Port F.I

Yes Fuel Filter-NEW

MAnifold Sensor , how much does this cost...

Answer 1

first off it sounds like two seperate issues. first the stalling problem, it sounds like a fuel delivery problem. the fuel pump electrical circuit runs through the oil pressure warning system. so in other words... check the oil pressure sender. make sure it is in good condition. it sounds like whatever the problem is it is happening in closed loop, which means it is looking at the o2 sensor, when it goes into closed loop it reads the oxygen content in the exhaust and adjusts the air/fuel ratio accordingly that means it could be seeing too much fuel ( hydro-carbons ) in the exhaust and cutting off fuel. another important thing is to make sure that the throttle position sensor ( the sensor that measures the amount of movement the throttle plate incures ) is reading at about 0.8 to 1.0 volt and should read 4.5 volts at full throttle. this is important because if it is reading high the ECU will think it is wide open throttle or flooding, and will shut down the injectors. next if that is within specs. you should look at the map sensor ( manifold absolute pressure sensor ) that tells the computer what altitude your car is at by measuring the amount of vacuum in the motor.it should be at about 150 hz. or so. next if you cant find a problem with any thing it might be in the motor, that being the case you need to take out a really heavy big baseball bat and beat the crap out of it and start hoofin' it!!!!:)

Answer 2

What motor is it? Do you have a cel on? Vacuum leak, maf sensor is common, egr stuck open. When did this happen tells a lot also. Mpi or tb ? You put on a new fuel pump did you also install a new filter? Maybe it could be water or bad gas

Answer 3

Well I don't know about thew first problem, but the second problem where you get to 50 mph - sounds kind of like a torque converter issue to me. I could be wrong though. I only say that because my grandmother had an "A body" Gm car which was always having issues with the torque converter. She had the V6 - do you have the V6 or the l4?

Answer 4

Is your exhaust good?? The pipe may be a inner outer pipe combo--the inner can collapse--not letting the gasses go out--stalling the car. Maybe the carb is no good--all the wires and stuff will still rely on the carb delivering the proper fuel/air mix to the cylinders. Spend a few bucks and go to a shop. get a pro to look at it

Answer 5

Assuming it is multiport fuel injected (MPI) or throttle body injected (TBI) you might have a bad throttle position sensor.

Other thing that sounds suspicious is the catalytic convertor might be bad or plugged up.

Good Luck!

Answer 6

could be crank sensor and the catalatic converter sounds plugged