Misfire under hard acceleration
#1
Misfire under hard acceleration
Hello, folks! I hope someone can help me with my wife's 2000 S40. The problem started all of a sudden; when my wife wanted to pass a truck on the highway, the engine started misfiring and the Check Engine light started flashing.
Our mechanic has since replaced plugs and coils, as well as air and fuel filters. No change; the engine still misfires under hard acceleration, although it starts normally and idles and accelerates smoothly if not pressed hard.
The mechanic also mentioned there were codes P0300 and P0304 in memory, but not present...
Any ideas?
Our mechanic has since replaced plugs and coils, as well as air and fuel filters. No change; the engine still misfires under hard acceleration, although it starts normally and idles and accelerates smoothly if not pressed hard.
The mechanic also mentioned there were codes P0300 and P0304 in memory, but not present...
Any ideas?
#2
Hello, folks! I hope someone can help me with my wife's 2000 S40. The problem started all of a sudden; when my wife wanted to pass a truck on the highway, the engine started misfiring and the Check Engine light started flashing.
Our mechanic has since replaced plugs and coils, as well as air and fuel filters. No change; the engine still misfires under hard acceleration, although it starts normally and idles and accelerates smoothly if not pressed hard.
The mechanic also mentioned there were codes P0300 and P0304 in memory, but not present...
Any ideas?
Our mechanic has since replaced plugs and coils, as well as air and fuel filters. No change; the engine still misfires under hard acceleration, although it starts normally and idles and accelerates smoothly if not pressed hard.
The mechanic also mentioned there were codes P0300 and P0304 in memory, but not present...
Any ideas?
#3
#5
#8
Also lets remember that jcjcrespo did replace the coils as well so if you didnt that could be your next thing to look at.
#10
Just make sure you are getting the Platinums as OEM type for this car.The regular plugs called "copper" belongs to a lawnmover not a turbo engine.
Also lets remember that jcjcrespo did replace the coils as well so if you didnt that could be your next thing to look at.
Also lets remember that jcjcrespo did replace the coils as well so if you didnt that could be your next thing to look at.
#11
When you say you are using Platinum plugs, are these the Volvo plugs? I had tried Bosch Platinum +4 and in my '02 and they did the same thing. The Volvo plugs (which I think are also Bosch) are excellent for these cars and you will not find much benefit in going with an aftermarket plug unless you have a serious tune.
If not the plugs, it could be coil packs & ignition wires.
Stan
If not the plugs, it could be coil packs & ignition wires.
Stan
#12
#13
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