Good day, I am driving a beetle (old one) I have a big problem with my exhaust, its making a very big noise and there on the back is a thing that you an change the settings and one of my friend changed it for me but the vehicle has no power and the fuel consumption is very high! I am extremely frustrated with this car and I don’t know what to do anymore. Please help?
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This is normally a sign of a leaking exhaust valve, it is too tight. the popping is unburned fuel leaking into the exhaust and then exploding with the exhaust from the next firing, sorry but a big job
If you hear the noise from middle or back, it might be a binding drive shaft for the 4x4 system that's making the noise. It's really hard pin point the problem area without verifying the vehicle. But the only things in the center\back of the vehicle that would make a noise in that speed range would be drive shaft and\or differential. Check the exhaust system well. There's a very big muffler on this model rav4 which's common to rust and make all kinds of noise. Usually it goes bad at the edges where it's welded. Check them as well.
I'm sorry for your dilemma, I would hate to give an answer, without a few questions. Is it the engine itself that actually gets louder, or the exhaust is where it's sounding louder? what kind of shape does the exhaust appear to be in? Being an older car, assuming with a lot of miles, there are certain things that could pertain to this...What kind of noise? Is it a rattling? An old heat plate could be the culprit, My first thought was if it reverberates back to the engine, it could be the catalytic comb has failed and broken apart to sift into the exhaust to cause blockage and emit noise from both ends, obviously from vibration noises and restrictive back exhaust. Is there a lack - feeling of power?
I'm just guessing since I don't have it here to look at. Your exhaust hanger in the middle part of the car is broken and needs replacing. It's two red rectangular rubber hangers secured by it's own sub-frame located after the catalytic converter.
This seems to be a classic case of "disentegrating exhaust system syndrome." There is either a hole(s) somewhere in your exhaust system or there is a leak somewhere. Probably the easiest way to tell where the noise is coming from is to start your car and just listen around in the engine bay, under the car, and at the muffler. Also do a visual inspection of the exhaust system to see if you can see any holes in the piping. I have also seen hairline cracks in the exhaust header itself that can cause the loud ticking noise that can be a little tricky to track down.