1999 Le Sabre misfires engine light on and off
60

Asked by STLcookie Mar 29, 2015 at 05:40 PM about the 1999 Buick LeSabre Custom Sedan FWD

Question type: Maintenance & Repair

Car began missing during a ong drive two weeks ago. Minor missing with no check
engine light. Progressively got worse. Checked for vacuum leaks, none. Coil pack,
has constant flashing using spark indicator. Check engine light came on with code
p0300. Irregular intermittent misfire. Last July 2014 I replaced the upper intake
manifold with new gaskets on the lower.New PCV, IAC and MAP. The car ran great
for 8 months. Changed Mass air flow 3 years ago, ECM 4 years ago.The plugs had
over 80,000 miles so I changed them today. One was cracked #6. Now the car runs
very bad with a flashing check engine light. I shut down and I am looking for help.

3 Answers
60

STLcookie answered 9 years ago

Did not change plug wires. Irregular misfires have changed to a constant misfire. Dumping gas into exhaust and I think this is making the check engine light flash. Not sure how to check resistance on coil packs. .

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60

STLcookie answered 9 years ago

Thank You Jim, Started over checking everything except the plug wires (on purpose). Changed plug wires upon your recommendation and, new engine. I;ll add this to the must do column when doing this work again. Best of luck, Randy

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10

GuruXF1ZC answered 5 years ago

When my 2002 Buick lasbra read that I had multiple misfire it was the ingintion modular That the coil packs sit on

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