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Post by larryS on Dec 7, 2017 16:52:38 GMT
I had a noise coming from my car, and I brought it in, and the guy opened the hood, and looked under the car(without putting it on a lift) and identified the issue.
I know some people here are into cars....so I will let you come up with your guesss....but then I have a question to follow.
Its a noise, like a metalic ticking sound...it can be loud. Its the loudest if I go though a fast food drive through and the sound echos off a side of a building. Its like the sound of a baseball card against the spokes of a bike...except much slower and more metalic in sound. When I am stationary the sound is pronounced. when I put my foot on the gas it goes away or maybe its just hidden by other noises...not sure. In park or in drive, stationary or slowly coasting its pronounced.
give me a guess....then I will give the diagnosis I got..
there is no noticeable performance issues with the car..like decreased miles per gallon
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Mrv
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Turgid Member
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Post by Mrv on Dec 7, 2017 17:27:49 GMT
The mechanic had one advantage we don't have: he was able to use his hearing to try to focus in on the area of the engine where the noise was coming from, which makes it easier to diagnose.
My guess: perhaps a ticking valve that needs to be adjusted, or a small exhaust leak, probably at the exhaust manifold.
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Post by larryS on Dec 7, 2017 18:46:33 GMT
Wow. you could be right. He called it an exhaust shield.
So I asked him if it has to be replaced....and he said.....no I just take it off.
which lead me to the question....if its there for a reason....is just removing it ok? I am not looking to replace it at an added expense if i dont need to. And he obviously could make more money if he replaces a part.
He seemed pretty confident.....so I am just asking
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Mrv
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Turgid Member
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Post by Mrv on Dec 8, 2017 0:20:35 GMT
The exhaust shield is probably not going to cause the problem, a leaking exhaust gasket is the likely culprit.
I don't know anything about the layout of your car's engine, but on my older Volvo's there were exhaust shields which I removed without problem in order to make it easier to work on the engine.
Frankly I cannot see how the shield could create any noise, it is mounted (at least on my cars) in a location which could not generate a noise such as you describe if a problem arises.
Clarify with the mechanic: does he mean a leaking exhaust gasket?
Then again, I've not wrenched on any newer cars, so perhaps designs have changed.
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Post by larryS on Dec 8, 2017 0:39:14 GMT
are leaking exhaust gaskets expensive to fix for a novice like me that has a mechanic do it.
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Mrv
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Turgid Member
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Post by Mrv on Dec 8, 2017 1:30:24 GMT
It depends on how easy it is to access the exhaust manifolds to effect the removal and repair.
Modern cars cram a lot more stuff into the engine bay than the Swedes did with my old Volvos, that's for sure.
Replacing the gaskets is easy, once the exhaust manifolds are removed; it's removing them that you'll be paying for.
I suggest you call a couple of other shops and ask what they'd charge to replace the exhaust gaskets on your car; then compare it to what your mechanic will charge.
I say "manifolds," not knowing whether your car is a four banger and has only one manifold, or is a V-6 or V-8 and has two.
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Post by larryS on Dec 8, 2017 17:31:26 GMT
I really appreciate the info.
Yesterday when he looked at it and initially diagnosed the problem, I made an appointment for next week, and I asked if i could make it fir first thing in the morning so I could wait. He said fine....and it would take about 45 min. Do I am guessing its a simple thing to do. Unless he looks close and sees something else. Once its on the lift and they are going to fix it...I am probably not going to tell them to stop and then start calling around for quotes. I am a lousey consumer. Its 4 cyl.
but the question still stands from the original. He said its the covering. And eh said the solution is to just remover it (not replace it). Is the cover insignificant.Or does it open me up to future damage if its removed.
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Mrv
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Turgid Member
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Post by Mrv on Dec 8, 2017 20:21:12 GMT
I would need to see the engine to give an opinion with any weight to it, sorry.
And I am not certain we are talking / thinking about the same part.
The exhaust shield I am referring to is bolted to the exhaust manifold using the same bolts used to attach the manifold to the cylinder head; it is more of a heat radiator than a shield.
True heat shields are not, in my cars anyway, attached to the exhaust manifold.
But designs change, and technology marches on.
I still am baffled as to how a shield would generate any noise at all, it's a passive, non-moving item.
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Post by larryS on Dec 12, 2017 17:58:34 GMT
as it turns out..it was rusted coverings over the catalytic converter that caused the loud rattling sound. He said he put clamps on it and if it returns he may have to replace it. Cost only 55 dollars...for a mechanical dope like me, thats getting off easy.
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Mrv
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Turgid Member
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Post by Mrv on Dec 13, 2017 3:15:08 GMT
That's a new one on me.
With a cat, the rattling is usually caused by the interior baffling falling apart.
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Post by larryS on Dec 13, 2017 3:58:21 GMT
its all baffling to me
the sound is gone....so it worked fr now.
like i said it was really loud to the point of not being able to give a clear order at fast food drive thrus.
for such a horrid sound.....clearing it up for 55 bucks is a gift
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Post by Fisk on Dec 17, 2017 4:53:03 GMT
Sorry I was too busy to respond.
I'm quite familiar with this issue, what with living in the Rust Belt. The heat shield is mostly a redundancy. If it's one that covers the manifold (under the hood) it's essentially a barrier for anything leaning on it. A hose or wire lying dead on the manifold will burn up, while one lying on the heat shield will only get soft. And unless your car is a home made hack job mess with the wiring and hoses, nothing will be in that general area anyway, no matter the make/model. In other words, it's fine.
The other is one which serves as a barrier between the exhaust and the underside of the car. Behind it there'll oft be reflective tape as well. Again, it's all redundancy. I suppose a car with no barriers that was also flogged to death perhaps has a possibility of catching on fire. An A-to-B'er without one isn't ever gonna have a problem, ever.
It's a very common issue for any car of age. It was a "tinny" sound, yes? It's but a thin piece of stamped aluminum. Imagine cutting an 8" x 20" piece out of a screen door. That's essentially what makes up the shield. Bolt aluminum to steel and it melts on its own no matter the climate.
Cut it off and think of it no more.
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Post by larryS on Dec 18, 2017 1:27:40 GMT
yes it was on underside, and yes a tinny sound..which probably sounded worse than what the problem was,. thanks
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Post by MengelesGhost on Dec 27, 2017 21:50:37 GMT
Buy a new one you tight fisted Jeden
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