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Dan
Dan, Technician
Category: Buick
Satisfied Customers: 23591
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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1990 buick century: been running and warmed..wont restart..cools down

Resolved Question:

1990 buick century 6cylider after been running and warmed up if shut off it wont restart till cools down what are possible causes
Submitted: 7 years ago.
Category: Buick
Expert:  Dan replied 7 years ago.
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
Customer: replied 7 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
Expert:  Dan replied 7 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 and 4 other Buick Specialists are ready to help you
Expert:  Dan replied 7 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.