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1990 buick century: been running and warmed..wont restart..cools down

Customer Question
1990 buick century 6cylider after...
1990 buick century 6cylider after been running and warmed up if shut off it wont restart till cools down what are possible causes
Submitted: 8 years ago.Category: Buick
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Answered in 5 minutes by:
6/18/2009
Buick Mechanic: Dan, Technician replied 8 years ago
Dan
Dan, Technician
Category: Buick
Satisfied Customers: 24,731
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
Verified
It sounds like you have a failing fuel pump, when they go bad they often work while cold until warm. You can verify this is the problem by doing a fuel pressure test and can barrow a tester from your local parts store. Fuel pressure should be 40-47 psi with key on engine off while vehicle will not start. If it is low replace pump. Let me know if you have questions or need anything. Thanks
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Customer reply replied 8 years ago
there if excellant presure at the presure relief valve. and it runs like a champ but shut it off and it wont start. it does not die and after it cools down starts right away
Buick Mechanic: Dan, Technician replied 8 years ago

This is likely caused by a failing camshaft position sensor.. Let me know if you have questions. Thanks

 

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Dan
Dan, Technician
Category: Buick
Satisfied Customers: 24,731
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Buick Mechanic: Dan, Technician replied 8 years ago

I read the question too quick and thought you said it runs good just doesnt start up and didnt realize the vehicle does not stall. If vehicle does not stall but will not start when warm the problem is the ignition control module which is Above RH Side Of Front Valve Cover. Sorry about the confusion. Thanks

 

 

  • Disconnect 14-way connector at ignition module.
  • Disconnect Spark plug wires at coil assembly.
  • Remove nuts and washers (3) securing ignition module assembly to bracket.
  • Remove 6 Torx screws securing coil assembly to ignition module.
  • Note lead colors or mark for reassembly.
  • Disconnect connectors between coil and ignition module.
  • Remove ignition module.
  • graphic

  • Connect coil and connectors to ignition module.
  • Install 6 Torx screws torque to 3 N-m (27 lbs in).
  • Install nuts and washers securing assembly to bracket.
  • Connect plug wires.
  • Connect 14-way connector to module.
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