I keep having a problem with the codes PO306 ....repair everthing I could read a on 1997 Buick Park Avenue

replace spark plugs ,wires, coils, M.A.P. clean thottle body, change fuel pump, fuel filter. map sensor, and many more and still Code PO 306 ....clear the code and in 10min. it will go back ... please help..

by in Maple Heights, OH on October 28, 2012
5 answers 11 comments
ANSWER by on October 28, 2012
P0306 is a misfire code for cylinder #6 Have you checked the fuel injectors (Resistance, leaking, clogged, inop.)? Have you done a compression test, dry and wet? Leak down test? Stop throwing parts at it and start doing some diagnostics!
COMMENT by on October 28, 2012
I did that ,but I didn't done a commression test yet..I will try that soon..
ANSWER by on October 28, 2012
CHECK FOR VACUUM LEAK AT/AROUND # 6.
COMMENT by on October 28, 2012
I done that
COMMENT by on October 28, 2012
HOW MUCH COMPRESSION ON THAT CYLINDER? (PSI) ALSO HOW DID YOU CHECK FOR VACUUM LEAK? DO YOU HAVE INJECTOR PULSE? IF YOU HAVE PROPER IGNITION FIRE THEN IT CAN ONLY BE COMPRESSION, VACUUM LEAK OR NO FUEL!
COMMENT by on October 28, 2012
no
COMMENT by on October 28, 2012
NO-WHAT?
COMMENT by on October 28, 2012
NO-THAT-MAN!
ANSWER by on October 28, 2012
You forgot to change the fuel injector on cylinder six.
COMMENT by on October 28, 2012
yes I done that....
COMMENT by on October 28, 2012
He knew , he just forgot.
COMMENT by on October 29, 2012
changed everything short of the valves, piston and rings...checked vacuum leaks, fuel pressure and injector pulse but STILL did not find time to do a compression test!
ANSWER by on October 28, 2012
Do you have a vacuum guage? If you do , plug it in to a port past the throttle plate and see what it's doing. Let us know the reading and if it fluctuates or it's steady. intake leak is a good possibilty , but don't check it the way some of us would (with expierience) unless you have a fire extinguisher handy.
COMMENT by on October 28, 2012
I JUST FIGURED IT OUT, I DON'T KNOW WHAT THE HELL I AM TALKING ABOUT! MAYBE ONE MORE NIGHT IN A HOLIDAY INN EXPRESS WILL DO THE TRICK.
COMMENT by on October 29, 2012
I'm Tom-Tom Bowdett , and I'll leave the key on for ya'...........OH DAMN!!!!!! Screwed up again.....That's the wrong hotel chain. Sorry ,Warm beer will be in the moldy fridge. Enjoy your stay!
ANSWER by on November 23, 2014
Had problems like that, car was even hard to start, i started putting injector cleaner into gas and the car start great and runs smooth

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