I just changed my spark plugs and now the car jerks when its in drive, reverse etc.. Anyone know what could be the problem. Help me please.!

 

something up with your valve body

 

Bump, I really need help. My uncle said one of the spark plugs is bad and i'm running on 5 cylinders that is why it is jerking? Any ideas what it could be or how to locate the broken spark plug.

 

if one of the cyl. are bad, your idle would be really rough. Is yours rough? What type of sparks did you put in?

 

My idle is around 600 but the car would jerk a bit and it would drop to like 300. I put in NGK Laser Platinum. Thanks, David.

 

Was your car running fine before you changed the plugs?
Did you do anything else when you changed the plugs?
Did you reset your ECU after you changed the plugs?

 

Was your car running fine before you changed the plugs?
My car was running fine before changing the spark plugs, just doing a tune up.

Did you do anything else when you changed the plugs?
Nothing else was done.


Did you reset your ECU after you changed the plugs?
The ECU was not resetted, I thought you don't need to reset the ECU for spark plugs.

 

This sounds like a problem I had on my old- Oldsmobile Cutlass,
when 1 plug is defective it will make your only use the remain 5 cyclinders causing it to mis fire. If you like your car idle and goto the exhaust does it sound like its spitting or somethin? or sound not like a normal steady groan, but a jump in noise ever second or so? Now on my cutlass it turned out to be a bad spark plug and the power manifold..huh?..anyway, if you see any of that, then you may not want to drive the car

 

I'm driving the car to the mechanic tommorow morning before I go to work. I'm guessing it is a bad spark plug or one that misfires. Works on and off. I did a check for the bad spark plug and could not find it.

Update: I have NGK Laser Platinum spark plugs.

 

[QUOTE]Was your car running fine before you changed the plugs? Before taking it in to the mechanic you might double check all the plug and coil connections. It sounds like you have a bad electrical connection or a bad plug.

You can try to isolate which plug might be bad by disconnecting the individual plug connections one at a time while the engine is running. If a plug is working well when you disconnect it the engine will sound worse. If the plug was not working then when you disconnect it there will be no effect on the way the engine sounds. If one plug seems to be bad you can put back one of your old plugs and see if that fixes the problem. Then you would know for sure the plug you used as a replacement was bad.

Good luck.

 

I fixed the problem! I first tried what kvzeyde, recommended but the bad spark plug was not dead but just went on and off ever few seconds causing the car to jerk. I took one old spark plug that I took out and placed it in the first cylinder then started up the car and checked if it ran fine. Then I knew it wasn't the spark plug I just took it and replaced it with the next cylinder. After I replaced the 5th spark plug the car ran nice and smooth. So, I just need to buy one more NGK platinum spark plug tommorow and my max should run fine.