I am an ase masterech and this one is givin me fits
SOURCE: Intermittent Misfire on cyl #4 1997 Buick Lesabre
How's your coolant level? The intake manifolds on the 3.8L engines are prone to breakage at various locations causing coolant leaks into the crankcase and vacuum leaks on intake ports.Removal of the upper intake manifold will be necessary for inspection. Also, check for vacuum leaks at various locations on the outside of the intake manifold using WD-40 or brakeclean/carburetor cleaner sprayed hoses, non-electrical components, at the base of the manifold etc. As for a faulty injector, not likely but if you suspect one you can always swap the suspect injector with another on the engine and see if the misfire follows the injector. Just be sure to relieve the fuel pressure before servicing. Hope this helps.
SOURCE: MY 2002 honda s2000 has a rough idle its
I would say the coil is most likly the problem if it runs 2 cly. and i would not drive it because of unburned fuel going into the cly's.
SOURCE: i have a 2000 gmc sierra 5.3 with a number 6
I would check the valves for number 6. If one or both are burned, stuck or out of adjustment it would cause your problem. If a cam lobe for that cylinder is burned or badly worn it could be the culprit.
SOURCE: 1999 f250 5.4 cyl 5
If you got a PO305 Code Replace COP Coil #5
You don't need a dealer
You will be doing a lot of them,as time goes by.
I get so frustrated with this dealer thing.
I have a Lincoln LS, that is by far the most complicated vehicle ford ever dreamed up.
I have done 2 coils this year,at $59.00 each.
Some people on this site, are up to $5000.00 at the dealer, and not had one issue repaired yet.
If the misfire is real bad ,you may have to walk the new coil from one cylinder to the next until you get the offender. In that senerio,the PO 300 Codes won't always work.
Let me know how your doing. Please do your own work. Your dealer proved to you, they can't help you.
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