Has new plugs & wires. Was running great prior to changing. Now it is misfiring.
One of the following is probably the issue.
1. You have two or more wires connected to the wrong place on the coil.
2. You did not completely seat one or more wires on one or more of the sparkplugs.
3. You have two wires touching or gronding somehow.
SOURCE: Where can I find a spark plug wiring diagram for 1997 3.1l engine
Normally the firing order will be stamped on the top of the intake manifold also the number one plug will be the front one on the drivers side of the car. On the top of the distributor cap you should see a number one that is where the number one plug wire goes follow the firing order on the manifold and go clock wise on the distributor cap
SOURCE: i need to know the firing order for my sparkplug
You didn't tell us the engine size, so here are all three options...
2.5 liter L4 VIN "U"
2.8 liter V-6 VIN "W"
3.8 liter V-6 VIN "3"
With Type I Ignition
With Type II Ignition
SOURCE: oldsmobile alero misfires
a few things that could be happening here... When you run a tank dry, it often pulls the sediment from the bottom of the tank... this is very bad for fuel injection systems. Having it run "dry" like this could have damaged your injectors. I doubt the flooding of the engine with gas could have caused any damage that would result in misfiring. I would suggest starting with the cheapest solution first, which is Oil detergent. I prefer CD2 oil detergent. It is primarily used for sticky lifters, but can help with many simple motor issues. It costs a massive 5-8 dollars at any auto parts store or that "W-mart" store.
Make sure your oil levels are where they should be, and pour this product in the oil receptacle. Run the car for about 200-500 miles ( doesnt have to be in one trip hehe). After about 200-500 miles, perform an oil change (including filter). If this clears your issue up, great! it only cost you 30 bucks total.
If not...
Misfire is caused by 3 things and 3 things only. Fuel, Spark, AIr. These are what makes a motor fire. The second cheapest solution is timing adjustment. Any service shop like Muffler M. or Belle Tire, etc, should be able to perform this for 25-40 dollars. It is very possible during your spark plug / wire change, the distributor cap got turned out of alignment with where it should be.
While you have it at the shop, you should ask them to inspect the plugs and wires since thier hands are already on the device they are all connected to. This will remove or confirm one more possible issue.
The next step would be checking AIR. Airflow can be restricted by something as cheap as a cruddy filter, but rarely does this result in a misfire, so, even though its possible, im taking this off the table, Again, during the timing inspection, feel free to ask them to check it.
Another part of AIR is your EGR valve. This is a device that, put simply, recycles your exhaust. If your motor is dependant on this device, and it's cruddy, gummed up, or plain no good, it could be robbed of essential air and fuel. This can usually be checked with a "Code Check" at any service shop for free.
The final part is FUEL. Always the last place you wanna look, because it's the most expensive. This could range anywhere from Fuel Pressure, dirty fuel injectors, or a damaged fuel pump. Again, when you ran that tank dry, there is a possibility you pulled sediment thru one of these devices, or clogged your fuel filter. I hope, and you hope, if it is a fuel issue, it's just a dirty filter. I hope this helped.
All that is left is FUEL. This part is usually expensive no matter WHAT the
SOURCE: 2000 OLDS BRAVADA FIRING ORDER DIAGRAM
For the Oldsmobile Bravada 4.3L V6:
Firing Order:
1-6-5-4-3-2
Cylinders:
......(back)......
|..6..|.......|..5..|
|..4..|.......|..3..|
|..2..|.......|..1..|
......(front)
Distributor Connections:
...........(back)
Coil-> o
6-----> o.......o <-----5
4-----> o.......o <-----1
2-----> o.......o <-----3
...........(front)
Let me now if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
SOURCE: what is the firing order of the 3.8L engine in a
1992 Oldsmobile Delta 88 3.8 liter V-6 VIN "L" - Identifying Ignition Types I and II
On Type I coil
packs, three twin tower ignition coils are combined into a single coil
pack unit.
On Type II coil packs, the coils can be replaced
separately and the ignition wires are all on the same side of the coil
pack.
With Type I Ignition
With Type II Ignition
Hope helps (remember comment and rated this).
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