SOURCE: Random Cylinder Misfire
Im having the same problem with a 96 buick century. I wondering if its the coil packs. The plugs and wires have 8000miles of use. So i think it shouldnt be them. But same symptoms, engine code P0300.
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: Buick century misfire
it could be thermosat...i would also check EGR valve the are common to stick out and cause misfires
SOURCE: i have a 1996 buick century 3.1L. misfire # 1 cylinder
add some additive and take apart and clean again. change the fuel filter also cause it sounds like theres something clogging somewhere and it will take some trys to get it all out
SOURCE: 95 buick riviera supercharger
you can not put a regular 3800 intake in place of the 3800 super charged engine,the compression ratio is lower than the regular 3800 engine.......!
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