This may be long so bear with me. About a year ago one of my spark plugs came loose and caused a miss. Plug did not come out of the head. I tightend the plug up but it still has what feels like a slight miss while driving. Here is what I've replaced or checked since then.
Replaced plugs twice, plug wires twice, both coils, ignition control module, battery, TPS sensor, IAC sensor, all four fuel injectors with reman ones, fuel pressure regulator, EGR valve, EGR valve solenoid, pcv valve, fuel filter, and air filter. Catalytic converter and muffler were replaced three years ago. Crank positioning sensor was replaced two years ago. I've checked all of the vacumn lines and replaced a few.
I checked the compression and the cylinder that the plug had come loose in had the lowest compression at about 150-155. two others were around 170-175 and one was around 190. I had a shop check the compression and he got around 170 for all except for the one was a little lower. compression was still in specs according to my factory service manual.
Fuel pressure was checked and supposedly it was normal according to the shop.
I had the dealer check out the car and they said that the EGR valve was not working correctly and is why I replaced the EGR valve and solenoid. They also said that my torque convertor was locking/unlocking at higher speeds and was the cause of the missing feeling that I was experiencing. I had a transmission shop check the car out and they didn't find anything out of the ordinary.
There are no codes stored in the computer and no CEL showing. When I start to rev the engine up while its in gear, you can feel it begin to have that missing feeling. The car also has a puffing sound out of the exhaust at idle but its done this the whole time I've had the car(3 1/2 year and 56,000 miles)
Needless to say, the car is not very fun to drive. Can anyone give me any direction on what to do next? Does this sound like a valve problem? The car has 132,000 miles on it and I've owned it since 76,000 miles. Any help would be appreciated.
Wayne
Replaced plugs twice, plug wires twice, both coils, ignition control module, battery, TPS sensor, IAC sensor, all four fuel injectors with reman ones, fuel pressure regulator, EGR valve, EGR valve solenoid, pcv valve, fuel filter, and air filter. Catalytic converter and muffler were replaced three years ago. Crank positioning sensor was replaced two years ago. I've checked all of the vacumn lines and replaced a few.
I checked the compression and the cylinder that the plug had come loose in had the lowest compression at about 150-155. two others were around 170-175 and one was around 190. I had a shop check the compression and he got around 170 for all except for the one was a little lower. compression was still in specs according to my factory service manual.
Fuel pressure was checked and supposedly it was normal according to the shop.
I had the dealer check out the car and they said that the EGR valve was not working correctly and is why I replaced the EGR valve and solenoid. They also said that my torque convertor was locking/unlocking at higher speeds and was the cause of the missing feeling that I was experiencing. I had a transmission shop check the car out and they didn't find anything out of the ordinary.
There are no codes stored in the computer and no CEL showing. When I start to rev the engine up while its in gear, you can feel it begin to have that missing feeling. The car also has a puffing sound out of the exhaust at idle but its done this the whole time I've had the car(3 1/2 year and 56,000 miles)
Needless to say, the car is not very fun to drive. Can anyone give me any direction on what to do next? Does this sound like a valve problem? The car has 132,000 miles on it and I've owned it since 76,000 miles. Any help would be appreciated.
Wayne
