I have a '98 Corolla CE Automatic with 250k and am trying to figure out what is causing excessive engine vibration. The vibration happens mostly at 900 rpm and below, and is the worst while idling at stop lights (in drive with foot on brake). It is also noticeable while in neutral and park. If I am sitting at a long light I will often switch to neutral and push the gas pedal to get the rpms above 1000 (and thus stop the shaking). Its gotten steadily worse over the last year and at this point its so bad that I don't enjoy driving the car.
I took it to a mechanic and they said it was due to worn motor mounts. I had them replace the mounts (all 4) for a ridiculous price, but alas that did not fix the issue. In fact, the vibration feels worse with the new mounts! I took it back and the mechanic inspected it further, but said they couldn't find anything wrong and sent me on my way. After a bit of online research I have done the following:
• Replaced spark plugs with new OEM plugs
• Put in new air filter (OEM)
• Replaced PCV Valve and Grommet (OEM)
• Checked for loose hoses
• Replaced transmission fluid and filter (I realize this is probably unrelated, but it was due anyways)
• Inspected MAF Sensor (it looked clean to me)
• Inspected throttle body; it was slightly dirty but didn't seem that bad.
I also purchased some fuel injector cleaner, but haven't put it in yet (waiting until my tank is about empty as per instructions).
At this point I am not sure where to go from here. I've had 3 different mechanics inspect it and they all agree that the vibration is excessive, but none can find anything wrong! Suggestions? Also, please note that I am not very mechanically inclined and have a limited tool set. I can do basic stuff like switch out parts, etc.. but don't feel comfortable doing anything super technical.
I took it to a mechanic and they said it was due to worn motor mounts. I had them replace the mounts (all 4) for a ridiculous price, but alas that did not fix the issue. In fact, the vibration feels worse with the new mounts! I took it back and the mechanic inspected it further, but said they couldn't find anything wrong and sent me on my way. After a bit of online research I have done the following:
• Replaced spark plugs with new OEM plugs
• Put in new air filter (OEM)
• Replaced PCV Valve and Grommet (OEM)
• Checked for loose hoses
• Replaced transmission fluid and filter (I realize this is probably unrelated, but it was due anyways)
• Inspected MAF Sensor (it looked clean to me)
• Inspected throttle body; it was slightly dirty but didn't seem that bad.
I also purchased some fuel injector cleaner, but haven't put it in yet (waiting until my tank is about empty as per instructions).
At this point I am not sure where to go from here. I've had 3 different mechanics inspect it and they all agree that the vibration is excessive, but none can find anything wrong! Suggestions? Also, please note that I am not very mechanically inclined and have a limited tool set. I can do basic stuff like switch out parts, etc.. but don't feel comfortable doing anything super technical.