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2010 Lacrosse code p0300 random multiple misfire detected ...NEED HELP

Troy D

New member
5
0
1
Buick Ownership
2010 Lacrosse CXL
3 weeks ago the problem started with a random misfire in cylinder 2...so I went to auto zone and changed the spark plug...that made it go away and cleared the code on its own...so yesterday I as I started the car leaving the store which I was only there for 10 minutes...I got a blinking engine light followed by hesitation while in reverse...my scanner gave me the code, p0300...
following the cylinder 2 misfire , I changed ann the plugs (bosch) spark plugs...(duralast gold) coils ...a new mass air flow sensor, 3 new o2 sensors, air filter, purge valve , oil change...I only use 93 adding a bottle of injector cleaner every other fill up..i started using it because back in the summer I got a code saying add injector cleaner , probably from bad gas...so now I don't know what the problem could be now after a thousahd dollar tune up...do anybody have any direction I should head in now before I go get ripped off at the shop ...Thankjs
 

SUPERBEN

Full Member
18
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1
Buick Ownership
Buick
I have a 2011 CXS , same issue . . .ended up being bad injector . . . .fuel rails are a bear to get out. . . .buy the injectors off Amazon _ $95 a piece a month ago. . . . then pay the shop or a garage mechanic to swap them out.. . . it is probably a leaky injector--- mine had 89,000 miles.
 

Troy D

New member
5
0
1
Buick Ownership
2010 Lacrosse CXL
I have a 2011 CXS , same issue . . .ended up being bad injector . . . .fuel rails are a bear to get out. . . .buy the injectors off Amazon _ $95 a piece a month ago. . . . then pay the shop or a garage mechanic to swap them out.. . . it is probably a leaky injector--- mine had 89,000 miles.
 

Troy D

New member
5
0
1
Buick Ownership
2010 Lacrosse CXL
Thanks for the info...I kinda figured that , that's what it was all along...I was hoping not tho because if I replace one I may as well do them all, and that's gonna be upwards 1000 parts and labor all over again...
 
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