Rattling in the front or on the bottom of the car

Hi and thanks for using 2CarPros.com.

There are many things that can cause a rattle in the engine compartment. Based on your description, it could be related to a heat shield or the internal components in the catalytic converter may have come loose. The easiest way to check if it is one of these things is to simply take a rubber mallet and tap on the exhaust system to see if you can recreate the sound.

As far as the extended period amount of time for warm up, that is odd. However, there are specific components in the system that adjust to make the engine run good in all temps. If the check engine light is on, you need to scan the computer to determine if there are diagnostic trouble codes. Here is a quick video that shows how that is done:

https://youtu.be/YV3TRZwer8k

I realize most people don't own a scanner. If that is the case, most parts stores will scan it for free.

If the engine light isn't on, then I would suspect an issue with the coolant temperature sensor. This sensor tells the computer what the coolant temperature is. Based on that information, the computer determines how rich or lean to make the fuel/air mixture. The colder it is, the richer the mixture must be. On start up, if the computer thinks it is 100 degrees F, it will run a lean mixture and the engine may not run correctly if the outside temperature is actually 50 degrees F. The bad part is this. If the sensor is still sending a signal, it will not set a check engine light because there is a signal, regardless if the signal is correct or not.

To check that, you need a live data scanner so you can actually see what information is being sent.

Try the tests that I mentioned and let me know what you find. If you do find diagnostic trouble codes, tell me what they are.

Take care,
Joe

Hi and welcome back.

Your video is of the flywheel and connector plate. That is what connects the transmission internally with the engine. Any idea what that was hitting? Also, make sure all bolts are tight.

As far as the o2 sensors, there is an upstream (see picture 1) which is the heated sensor and there is a down stream (see picture 2) sensor. I am not sure why it is saying bank one and two. Can you send me the codes you are getting?

Let me know.
Joe

The 758 is for shift solenoid B (2-3 shift solenoid). I am not sure if you noticed anything with how the transmission shifts. And, as far as the other two codes, you are correct. Both sensors are involved.

Now, for the noise you get from the flywheel, can you turn the engine at the crankshaft with a wrench and watch as the flywheel turns what it may be hitting? Honestly, I cannot for the life of me picture anything that it may hit.

That is great news, and you are very welcome. You did all the diagnostic and repair work. Great job.

Let me know if you run into any trouble with the oxygen sensors.

Take care,

Joe

Welcome back.

Like you, I have no idea why the P is at the end of the code. The P at the start of the code indicates a power-train issue. I have nothing indicating the P at the end.

As far as the cylinder misfires and random misfire, it could be the result of the O2 sensors. I would start with them. Replace them, clear the codes, and drive it to see if the misfire codes return. If they do not, great. If they do, then consider plugs or ignition wires.

By the way, what did you find regarding the flex plate?

Let me know. And you are welcome to ask as many questions as you want.

Take care,
Joe