The code p0306 misfire detected
Common for injector sub harness to fail. If you have an injector code p0201-p0206 this may be the cause.
Do compression test. you can get the loan of one for free at your local auto parts store. do this before trying to chase down a possible electrical failure, most stores will check codes for free
SOURCE: 99 buick Lesabre
hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
later
paul
SOURCE: I am getting a misfire
I've got a 2002 Grand Prix GTP 3.8L Supercharged V6, nearly the same motor.
I had the exact same problem, misfire on Cyl. 5 and random/multiple misfire.
I replaced all the wires, plugs, coils, and even the ignition module. My next thought was either fuel or exaust.
Replaced my Cat. with a 2.5" ZZP downpipe, and the car ran alot better, but still had a tiny bit of hesitation over 4000rpms.
So i checked all the fuel injectors, and the #5 injector was bad.
To check, get an ohm meter, remove the injector connectors, and contact the 2 posts inside the injector. They should read between 12.4-14 or so.
Mine was at 11.2.
Replaced all the fuel injectors, and she runs like a champ
SOURCE: 1999 Grand Am 3400 v6 misfire.
I was asking about the pushrods because I had this problem with one of these engines that had a bent push-rod. I robbed a push-rod out of an older 3100 and it was just a fraction of an inch longer which bottomed out the lifter. I figured it out by removing the valve cover and loosing the rockers when it was running and it smoothed out. I'm guessing you checked for vacuum leaks already. How about injection pulse on the number 6 cylinder when running. Another thing you could check is running compression. You said you checked compression but did you just check cranking compression or did you check running compression too.
SOURCE: 2003 Dodge Grand Caravan v6 3.8L is misfiring
Damaging a plug wire will cause misfiring. If you are getting popping as well, it is almost certain that you have 2 or more wires on the wrong plug.
SOURCE: misfiring code po1399 cylinder 3 and 4
On most Honda's when you get a misfire happening across the whole engine like that there are a few likely issues. the ignition coil if it's a single coil style or the connector at the distributor. They also have some issues with EGR's and plugged ports which can mess with the fuel trim numbers. It's important to check the fuel pressure and if possible a timing offset spec from the scanner whenever you're dealing with misfires on any vehicles Honda or not and determine correct pressure and flow whenever possible.
Hope this helps.
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