1990 Buick LeSabre Questions

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It started and ran fine, then I parked it for an hour and have the problem above. Connected spark plug tester and ignition is functioning. Connected "noid" tester to injector harness and it blinks when engine turned over (injectors receiving pulses). Fuel pressure tested at 42 psi at fuel rail. So it's getting sparks, has adequate fuel pressure and the injectors are receiving "pulses" to operate. Removed a plug & it has good color and is not fouled. TPS sensor has .46 volts at idle and 4.8 at wide open throttle (working properly). Does anyone have an idea as to what the problem might be that would still result in the conditions above ?

I changed the plugs wires an coil

the car generally runs fantastic it just started this hesitation.when you are accelerating from a dead stop the car sputters as if it is on that ground by a toll. But if you roll just a bit first it goes just fine! after that it rides great.

I have a ’90 Buick LeSabre with the end of the shift knob broken off. I purchased a new shift knob but can’t for the life of me, figure out how to remove the damaged one and install the new one.

Can someone explain how I can do this?

Thanks in advance,

my 1988 Buick lesabre was overheating so I replaced the water it starts and shuts off after ten to twenty seconds .why could this be what are the possibilities??

I recently changed thermostat and the radiator and water pump seem to be working seem to be working fine.

((Note: The year and make selector at this site does not concur with my car.I have an 1989 ParkAvenue)) Seems to start and run smooth and even can accelerate to 3K+ rpm smooth and steady. When selection of any drive position and begin to accelerate, engine goes into a surging cycle and continues even when gear selector is back to Park; will not rev when in this surge cycle, bogs and almost stalls. I can turn off ignition and restart engine and is smooth running again. Again I can rev to 3k rpm smooth and rpm steady. Select gear and accel... repeats as above. Acceleration is at about 1100-1500 rpm to climb a hill when cycling surge begins. I can duplicate surging with brake on & in drive & accelerating; surging starts at about 1100-1200 RPM. Again, surging/cycling resets by turning off and restarting engine. Maintenance/shooting done recently: 1. Checked fuel rail pressure @41 psi; 2. Changed fuel filter; 3. New air filter; 4. swapped out the MAFS; 5. New Oxygen sensor; 6. Oil & filter changed about 200 miles. Where are the ECM, IAC, ICM located that I can do a vibration/tap test?

On the 3.8 lt. motor, does the front engine oil seal need to have the timing chain cover off, and to replace it from the inside?

one person said the problem is transmission mounts shops tell me it needs a complete internal rebuild does this 90 buick lesabre with the 3.8 motor have transmission mounts and what is their location

I have a oil leak around my front seal. My mechanic put a new seal in and its still leaking a lot at between 1100 to 1500 RPMS. He said the crankshaft is floating up and down at about .025. The car runs fine. Does this sound right? Help!Thanks!

My 3.8 motor has develop an oil leak on the front side of the motor and getting on a pulley which in turn is being thrown around. I recently had a timing chain replaced. Any idea where I might start looking. Its hard to see around all of the parts. Thanks!