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Misfire under hard acceleration

  #1  
Old 04-04-2010, 01:00 AM
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Default 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?
 
  #2  
Old 04-04-2010, 10:37 PM
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Originally Posted by jcjcrespo View Post
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?
Tell the mechanic to throw away the auto-lite spark plugs and use nothing less than platinum's which is the OEM type for this turbo engine.The spark blowout is obvious as the spark isnt strong enough.The codes are corresponding to the problem.
 
  #3  
Old 04-05-2010, 07:53 AM
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Actually, he said the plugs are AC, but point taken. My wife is on her way to purchase OE plugs from the local Volvo dealer. Will post results as soon as new plugs installed and tested. Thanks!
 
  #4  
Old 04-05-2010, 05:29 PM
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You were right, GerBeGurGya. Replaced the AC plugs with OE Volvo plugs and the misfire is gone. Well worth the extra expense. Thank you!
 
  #5  
Old 04-08-2010, 04:11 PM
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Glad you got it figured out. I've found that OEM plugs are the best way to go in my cars (S60R & 854R) with the exception of Bosch coppers in the 04.5+ S40 T5's. Those things rocked!!!
 
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Old 04-09-2010, 06:40 PM
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A+ Gerb does it again!
 
  #7  
Old 05-02-2010, 01:11 AM
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Glad I stumbled across this thread! My girlfriends S40 turbo has the same symptoms. I will get some OEM plugs and see what happens.
 
  #8  
Old 05-02-2010, 09:00 AM
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Originally Posted by myGFsVolvo View Post
Glad I stumbled across this thread! My girlfriends S40 turbo has the same symptoms. I will get some OEM plugs and see what happens.
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.
 
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Old 05-02-2010, 01:47 PM
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I changed the coils first in an attempt to fix the problem. I will make sure to get the platinum plugs. Thanks!
 
  #10  
Old 05-23-2011, 09:44 PM
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Originally Posted by GerBeGurGya View Post
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.
I have the same bucking/misfiring problem with my 2001 s40. I changed the spark plugs once I bought it about a month ago. The problem stopped for a little while, and is now back. I used platinum spark plugs when I replaced them. I'm going crazy trying to figure out what's going on (as I know little about cars). The ODO II reads a post catalytic O2 sensor when it comes up, which has been 3 times now. Mother of God help me.
 
  #11  
Old 05-23-2011, 10:07 PM
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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
 
  #12  
Old 11-09-2014, 08:43 PM
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Default Ditto!!!

My son has a 2000 Volvo S40 and is having the same problem. Already changed coil and wires and did tune up. I'm going to have to see if he has the platinum plugs. If anyone has any other ideas I would love to hear them. We don't have money to purchase him another car!
 
  #13  
Old 11-11-2014, 09:15 AM
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I use iridium plugs in both my turbo Volvos. When I purchased Volvo plugs at the dealer I believe they too are iridium, not platinum. You can buy NGK iridium plugs for about $7 each. The OEM Volvo plugs are a bit more. I paid 30 something total.
 
  #14  
Old 11-11-2014, 10:02 AM
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I like the ngk iridiums also.

I've had misfires from a bad map sensor before, not sure if I had a code or not. It was the one under the shield (we have two).
 
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