Extremely loud rumble when starting car, havent driven it since.

Discussion in 'Gen 2 Prius Technical Discussion' started by zacthedrivein, Jan 23, 2021.

  1. zacthedrivein

    zacthedrivein Junior Member

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    it rained yesterday and i went to drive my car last night and this really loud thundering noise happened. i immediately turned it off because i was freaked out. waited a couple minutes then tried it again. tried it one more time and the same thing happened. was too scared to try to drive it. today it wasnt raining so i decided to try it again, same loud noise, so i took this video and waited about 30 seconds to see if it would stop, but it kept going. still havent tried driving it. i've looked into it and im still not really sure what it could be. it seems like other people have this problem, but have suggested many different things. anyone actually know whats going on?

     
  2. Raytheeagle

    Raytheeagle Senior Member

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    Have you checked underneath the car to ensure the catalytic converter is still there?
     
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  3. PriusCamper

    PriusCamper Senior Member

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    For perspective I posted this to PriusChat a week or so ago: "Tuesday morning’s chase was Sonoma County’s second high-speed police pursuit of suspected catalytic converter thieves in one week. The county has seen a remarkable spate of over 100 stolen catalytic converters in recent weeks — usually from Prius models. Petaluma police had received a report from a nearby neighborhood of vehicle tampering by two men in a small, dark vehicle, McGreevy said. When officers spotted that car and tried to stop it, the vehicle sped off at such a high speed — at least 90 mph, police said — that pursuit was quickly terminated. Moments later, the driver lost control of the car, careening across the oncoming lane and into that tree, 150 yards south of the St. Vincent de Paul Church. In the Honda, police found a reciprocating saw and at least two catalytic converters the men were suspected of cutting from cars." https://www.pressdemocrat.com/article/news/thieves-steal-over-100-catalytic-converters-from-sonoma-county-cars/
     
  4. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    You've been cat-jacked. Somebody went under your car with tools and cut out an expensive part of your exhaust system.

    Unless you've got really good insurance coverage it's going to be very expensive to fix, sorry.
     
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  5. zacthedrivein

    zacthedrivein Junior Member

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    i havent, because some time ago whatever makes my hood able to open was broken. ie: i pull the lever and nothing happens. i think whatever connects that lever to the hood opening has broken. my mechanic knows how to open it somehow, though. i think they have to remove a bunch of stuff down there, cause i recall them forgetting to put it back together once
     
  6. zacthedrivein

    zacthedrivein Junior Member

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    well that sounds nice considering COVID jacked my job of 12 years last march. how come every time i search Prius rumble this isnt something that comes up? its always stuff about the "prius knock" or whatever
     
  7. zacthedrivein

    zacthedrivein Junior Member

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    oddly enough i have been overpaying for the most insane auto insurance on the market. if this is the case and they somehow cover it, it would be pretty crazy. i hope things finally work in my favor for once. ive been meaning to look for cheaper insurance.

    but tbh, if it costs 2K to replace it, i still probably came out at a loss on this insurance lol, so lets at least hope they cover it.
     
  8. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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  9. ILuvMyPriusToo

    ILuvMyPriusToo Active Member

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    Because of this forum, I immediately knew what had happened when my catalytic converter was stolen early in this crime wave (at that point it was mostly a UK phenom.). Yes, it is weird to hear that rumble again. Sorry to hear of another victim; CA required the OEM replacement which is expensive - so glad you have good coverage. File a police report and then give them a call. And look into some of the threads here for info on protective plates to keep it from happening again.
     
  10. oldtechaa

    oldtechaa Active Member

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    You don't need to open the hood to check the catalytic converter. It's underneath the car about halfway down the length. You should see a couple large bulges in the exhaust pipe if the cat was still there.
     
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  11. edthefox5

    edthefox5 Senior Member

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    I think if you have collision it may be covered not sure not an insurance expert but not many people carry collision on a 14 year old car.
     
  12. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    I think you mean comprehensive, and some people wind up carrying it longer than they really ought to vs. the depreciated value of the car, but then it works out.

    The bad news is that "it works out" might be that the insurance company looks at the case, agrees that they should cover the loss, then totals the car and hands the insured a check for $3k because that's all the old car is worth.

    A couple thousand bucks and no car is not exactly what most people want out of the deal, though it is a better deal than anyone without coverage is getting.
     
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  13. edthefox5

    edthefox5 Senior Member

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    Yes thanks comprehensive.
     
  14. Moving Right Along

    Moving Right Along Active Member

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    It cost 3k to replace mine, and it got stolen twice last year. But insurance did cover both times. You may have to rent a car for a while, though, since in my experience it’s been hard for repair shops to keep enough stock, due to the thefts. And it can sometimes take a few days (or weeks, depending on the extent of the shortage) before they can get one.

    After you get it replaced, I’d look into a protective shield to prevent theft. I got one (after the second time my catalytic converter was stolen) from http://www.getcatsecurity.com
     
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  15. ChapmanF

    ChapmanF Senior Member

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    If insurance totals the car, sometimes they will let you deduct its "salvage value" from the payout, and keep the car and what's left of the check. If what they consider the "salvage value" is low enough, that can work out.

    Though I think technically you have a salvage title at that point. In my state, once you can prove you've replaced the cat (and can prove where you got the cat to replace it), you can turn that into a 'rebuilt' title.
     
  16. PriusCamper

    PriusCamper Senior Member

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    A Google search is only as good at searching as the person who enters the right information. It's all about the the keywords you use... "Prius Rumble" is exceptionally vague...

    But use keywords: "Prius cat theft symptoms" and 1st thing you get is a google card (aka: most common/accurate response) that says:

    "You'll notice a loud rumbling or roaring sound as soon as you turn on the engine if your catalytic converter is missing. This gets louder when you hit the gas. The exhaust is not working properly, so the vehicle also drives rougher than usual, often with a sense of sputtering as you change speed." Preventing Catalytic Converter Theft | City of Garden Grove
     
  17. ChapmanF

    ChapmanF Senior Member

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    To be fair, that would be basing the search on the information the OP was looking for and didn't have yet.
     
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