Q: Car stalls at idle and fails to restart - 1993 Buick Century

asked by on

The car intermittently stalls at idle, and can fail to restart after this. Trying again after results in slow cranking, but nothing else. Sometimes it will start an hour later, sometimes not. It can stall upon placing in drive, and usually sputters so if I keep RPMs high, then ok. Check engine lights have never come on until recent. I'm getting a low voltage to the TPS code. I have replaced CKP sensor, ICM, and MAF. New battery, new fuel filter, the alternator and starter test fine. Replaced spark plugs and their wires. The car gets spark when it won't start. Throttle body and fuel injection cleaning as well. I've detached the Torque converter, but still stalled.

Could this be all from TPS or bad ECM ?

My car has 73000 miles.
My car has an automatic transmission.

Hello and thank you for contacting YourMechanic. The TPS (Throttle Position Sensor) could be a large part of the issue you are having. If there is low voltage to the the TPS, check the harness with the key on and engine off for a 5 volt reference to the TPS harness. If there is 4.5 volts or less, then the ECM has a possible fault. Remove the harness from the ECM and turn on the key with the engine off and see if there is a 5 volt reference to the pin for the TPS harness. If there is a 5 volt reference, then the harness has resistance on that circuit and needs to be replaced. If the reference is 4.5 or less, then the ECM needs to be replaced. If you need assistance troubleshooting the TPS signal, a certified professional from YourMechanic can come to your car’s location to assist with diagnosis and repair of the stalling problem.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car stalls at idle and fails to restart - 1993 Buick Century

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Whats up, my throw out bearing squeaks off the clutch when im driving almost like crickets jumping in my clutch. on my 93

This will not go away with just an adjustment. The cricket noise is the release bearing's internal bearings that are grinding and about to seize. The only fix is to replace it and the only way to replace it is...

Q: Getting a P0430 code on my Buick Century 3100.

Hi there. The code p0403 is for the EGR circuit that shows it has malfunctioned. The code p0430 is for the catalytic converter showing that its below threshold. Check the harness to the EGR and make sure that all of...

Q: Where is the best place in Apopka or Altamonte Springs, FL for brake service?

If you think it's time for brake pads and maybe brake rotors, you don't have to look for a garage. You can have the work done at your convenience by YourMechanic. They will send a technician to your home or...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.