just this saturday, felt a very bad vibration in the cabin and accelerator, and the motor did not sound good (very low tone). i changed three motor mounts. one on the right and two on the left.
i can still feel a little vibration in the cabin when i turn on the engine and on the accelerator when i depress it.
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Little Pig - 1999 Corolla LE - Manual Swap - 2001 front end - #138 @ CASC-OR Autoslalom 2012
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Could be a number of things that cause excessive vibration to be transmitted into the cabin. When you had the mounts replaced, did you notice anything unusual about them - cracked, rotted, otherwise damaged?
Could be anything from needing a tuneup (fresh plugs, air filter, fluid change, cleaning the MAF sensor, cleaning the throttlebody, etc.) to a vacuum or exhaust leak.
What is the maintenance history of the car?
Any work/maintenance performed recently, aside from the new mounts, that you did to the car?
When did you first notice the excessive vibration?
Anything else unusual - odor, excessive oil consumption, smoke from tailpipe, etc.?
Could be a number of things that cause excessive vibration to be transmitted into the cabin. When you had the mounts replaced, did you notice anything unusual about them - cracked, rotted, otherwise damaged? The rubber on the two bottom mounts were rotten. the two top mounts were soft.
Could be anything from needing a tuneup (fresh plugs, air filter, fluid change, cleaning the MAF sensor, cleaning the throttlebody, etc.) to a vacuum or exhaust leak. i regularly change oil (every 5k using Castol High mileage 10W30). air filter is changed every 10K-15K, and i clean the MAF everytime i change the filter (CRC Sensorkleen). i haven't changed the spark plugs since i got the car in 2007.
how do you find out if there is a vacuum or exhaust leak?
What is the maintenance history of the car? i keep up-to-date with my fluid changes
Any work/maintenance performed recently, aside from the new mounts, that you did to the car? nothing, except for the usual change oil
When did you first notice the excessive vibration? the car was running well as i was going southbound on Brimley Rd. i then turned left at a small street after Finch. i then executed a 3-point turn. the moment i pulled forward from the reverse, the engine started to vibrate hard and the engine also sounded very rough.
Anything else unusual - odor, excessive oil consumption, smoke from tailpipe, etc.? no unusual odor. a little white smoke from the tailpipe. and i top up a liter of oil around every 2k. these engines are known to burn oil (1ZZ-FE). with the transmission at "P" the RPM is about 800 and drops to about 700 when i shift to "N"
how do you find out if there is a vacuum or exhaust leak?
Old school method for finding vacuum leaks is to take a spray bottle filled with plain water and a couple drops of detergent and spray vacuum hoses, hose units and t's, around the intake manifold/throttlebody while the car is running. If the idle quality greatly improves after you hit a particular area, you found your vacuum leak.
Exhaust leak is a little harder to find - sometimes a visual inspection will lead you to leaks via their tell-tale soot accumulation around leaks (look for soft black, soot deposits around pipe unions, joints, over the length of exhaust tubing - use a compact mirror and flash light to check the top of those parts - easiest if the car is on a lift).
From your description of how the vibration started, did you happen to drop a wheel or two into a pothole/road depression or backed the car or high sided the car over rough terrain when you did that 3-point turn? If the mounts were soft or completely rotten, it could have allowed the engine to move excessively in that quick 3-point turn maneuver and torqued the exhaust system. For this generation - the exhaust union from the exhaust manifold to the front pipe (spring bolts) can loosen or break, that exhaust gasket there commonly gets blown out, causing an exhaust leak, same with the union between the front pipe and the catalytic converter pipe "bump" - that clamp can come loose/gasket get blown out. Those exhaust leaks (close to the O2 sensor) can cause an excessively rich run condition - will make the engine idle poorly/almost stumbling.
I'd definitely pull the plugs - as this sounds like a combination issue - misfire from worn plugs and an exhaust leak causing that change in engine sound. Your idle speed sounds good, and the maintenance you listed should be more than sufficient to get good results from the car. Oil consumption is starting to border on high consumption - but I've seen a lot worse (4-5 liters over that same period). That is a great oil to run to try and slow that consumption.
Old school method for finding vacuum leaks is to take a spray bottle filled with plain water and a couple drops of detergent and spray vacuum hoses, hose units and t's, around the intake manifold/throttlebody while the car is running. If the idle quality greatly improves after you hit a particular area, you found your vacuum leak. will try this one
Exhaust leak is a little harder to find - sometimes a visual inspection will lead you to leaks via their tell-tale soot accumulation around leaks (look for soft black, soot deposits around pipe unions, joints, over the length of exhaust tubing - use a compact mirror and flash light to check the top of those parts - easiest if the car is on a lift). the car was on the lift when i had the mounts changed... looked all over and didn't find any soot, except at the tip of the tailpipe
From your description of how the vibration started, did you happen to drop a wheel or two into a pothole/road depression or backed the car or high sided the car over rough terrain when you did that 3-point turn? If the mounts were soft or completely rotten, it could have allowed the engine to move excessively in that quick 3-point turn maneuver and torqued the exhaust system. the street was wide enough to do a U-turn, but i played safe and did a 3-point turn so as not to oversteer the wheels. and no, i did not hit any potholes or high-sided the rear.
however, i immediately shifted to "D" after making the reverse... maybe that is the culprit?!?
For this generation - the exhaust union from the exhaust manifold to the front pipe (spring bolts) can loosen or break, that exhaust gasket there commonly gets blown out, causing an exhaust leak, same with the union between the front pipe and the catalytic converter pipe "bump" - that clamp can come loose/gasket get blown out. Those exhaust leaks (close to the O2 sensor) can cause an excessively rich run condition - will make the engine idle poorly/almost stumbling.
will have the exhaust system checked... but i did not encounter any engine stumbling
I'd definitely pull the plugs - as this sounds like a combination issue - misfire from worn plugs and an exhaust leak causing that change in engine sound. Your idle speed sounds good, and the maintenance you listed should be more than sufficient to get good results from the car. Oil consumption is starting to border on high consumption - but I've seen a lot worse (4-5 liters over that same period). That is a great oil to run to try and slow that consumption. i will have to look at the plugs.
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still vibrating
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