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Re: No fire from coil to #1 cylinder
Ok since you did all that if you want to swap around fuel injectors taking note where you put cylinder 1 injector. Lets say you swapped it with cylinder 4 . Now if you get a different code say P0304 which is for cylinder 4 misfire then you know it is your injector at fault. These are wear items and should be replaced every 100,000 miles.
Also i would suggest if you dont want to do that is get some good high octane gas when you are completely empty and fill to 1/4 tank now put in Lucas Oil fuel injector cleaner and run the car till empty. Now fill up tank with high octane gas in see if this helps. Clear code after your second tank of gas and see if the code comes back. if code does pop back up then i would do the swapping of injectors as i stated earlier. I hope this helps and good luck with the diagnosis.
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First you need to determine what type of miss you have. Is it random on all cylinders, or is it restricted to one or two cylinders? Random misfire can be caused by crank or cam sensors that are starting to give out. Single cylinder misfires can be due to plugs, wires, coils (you already addressed those), as well as internal issues such as burnt or broken valves.
You should replace your Cap and rotor....Check for any vacuum leaks, When you replaced your plugs, were there any plugs contaminated with engine oil ? Some times manifold gasket goes bad...and causes vacuum leak...Hope this helps you alittle more ???
For the 1995 Pontiac Bonneville 3.8L:
To answer your question directly: The Firing Order DOES NOT follow sequentially on the coils! See Below Firing Order: 1-6-5-4-3-2 Cylinders: .......(back)....... |...2....4....6...| ________________ |...1....3....5...| .......(front)
For the Coils: (back) ....6 ....3 ....2 ....5 ....4 ....1 (front)
For this Type Coil (Solid One UNIT): (back) _____ |....o| <---6 |O....| |....o| <---3 |....o| <---2 |O....| |....o|<---5 |....o| <---4 |O....| |....o| <---1 (front)
For this Type Coil (3-Section UNITS): (back) ______ |....o.|<---6 |O.....| |....o.|<---3 _____ |....o.|<---2 |O.....| |....o.|<---5 _____ |....o.|<---4 |O.....| |....o.|<---1 (front)
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Here is a diagram of the firing order for you 3800 engine. Cylinders 1 and 4 are misfiring because the operate under the same "Coil Pack" and the coil pack has unfortunately gone bad. O'Reilly sells them for between $30-50 depending on the amount of warranty coverage you want. To replace, simply unscrew the screws that hold the coil pack in place. WAIT before unplugging the plug wires. Place the old coil pack and new coil pack next to each other, unplug one plug wire, then plug it to that same port on the new coil pack. then do the same for the other plug wire. Then screw your new coil pack in place, and start you car. should run fine!