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Reload this Page Please help...1999 Buick Century....3100 engine?
 

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Please help...1999 Buick Century....3100 engine?
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Default Please help...1999 Buick Century....3100 engine? - 06-17-2011

Car is running rough. It started 2 months ago, took it in and they said I needed a lower intake done, they did that along with a full tune up. Got it home and it ran rough after 3 miles, they then changed injector #5, got it back next day same thing, they changed injector #6. Ran great for 2 months. Now its running bad again and engine light is flashing again. We are getting a PO301 code. We changed injector #1 along with the coil and plug #1 again. The first time it was in the shop a compression test was done and was ok. Does anyone have any idea what to do next? It runs and doesn't die, just runs real rough all the time hot or cold. The car has less than 90,000 on it.
When it was injector #5 it was only misfiring on that cylinder, then it moved to #6 and then ran great for 2 months. Now its missing on #1...Changed that injector and its still coming up #1 cylinder
plugs and wires have been changed.
  
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Default 06-17-2011

Hi
That code is for multiple misfire. I had the same problem on my 2000 buick lesabre. It was the wires. The were dried out and fireing to ground on the screws that hold the coils in place. Take a look at night time for sparks around there.
  
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