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Odd Noise - Loose EM Heat Shield?

 
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Old 11 Oct 2016, 09:37 am
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Default Odd Noise - Loose EM Heat Shield?

Hello,

Vehicle: 2006 PT Cruiser - 2.4L (no Turbo)

During a recent long road trip we developed what I thought was a bad front passenger tire. From 0mph to 30mph we heard nothing, but at higher speeds we heard something that sounded just like road noise. After several stops to air up tires and inspect tires it was determined that it wasn't tire... but no clue what else. We gritted our teeth and continued/completed trip without incident.

Once we got home I opened the hood and started crawling around above and beneath. Suspension all looks great. Nothing torn, nothing leaking, no obvious damage anywhere. We recently had some head work done, and mechanics weren't as conscientious as I would have liked in putting everything back in place (nothing major, just my OCD), so I started inspecting the engine compartment for something loose. It didn't take long to notice both of the lower bolts (those close to the O2 sensor?) on the exhaust manifold heat shield were gone. I could put a finger under the shield and lift it pretty easily (both top bolts (those closest to the engine) are intact). So there's a fair amount of wiggle room... maybe wind, or engine vibration can get in there and create the sound I am hearing?

Feeling around I can feel nuts (?) on the underside, and can see what appears to be a stud fragment (nothing extends high enough to hold a topside nut)... maybe they broke? Can someone provide some info on what exactly is holding this heat shield on? I'm not sure this is the source of the noise, but I'd like to tighten it all back down and make sure. I just need to know exactly what is in there, and haven't had much luck getting the right search to provide results.

Thanks!
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Old 11 Oct 2016, 11:15 am
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Default Re: Odd Noise - Loose EM Heat Shield?

I hate to respond without a definite answer, but I have had other Chrysler cars where the nuts holding the heat shield on have come off.

My experience is that the cheap sheet metal nuts have rusted and fallen off the studs that protrude out of the floor. I'm guessing that the studs are also rusted.

I have fixed the problem by using large washers and regular nuts to hold the shield in place. If the stud is not long enough, you would have to put a new one in.

Again - this is an educated guess. I should get under my Cruisers to take a look to see if it is the same as what I have seen in the past.
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2006 Limited Edition, Inferno Red, 5-speed, Bassani dual exhaust, Chrome backup light bezels, taillight trim, fuel door, antenna mount, Ventiports, door spear covers & hood prop. Silver painted lower front grille. American Racing 383 Casino wheels, w/Chrysler emblems, '02 engine cover, PT Cruiser mudguards, cargo mat. EGR Window Visors, dark gray lock pulls, dual horns, Fuzzy Dice, flames and MOPAR emblems added to front door logos, gold Chrysler emblem on rear hatch. Upgraded to RAK radio with 6 CD changer, Cassette Tape and RDS info. Name: "FIREBALL" I bought it Aug 10, 2015, with just over 35,600 miles on it.

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Old 11 Oct 2016, 01:01 pm
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Default Re: Odd Noise - Loose EM Heat Shield?

The way it is setup, there's bolts that go thru the lower heat shield into threaded holes on the manifold. the upper shield is placed onto the section of the bolt protruding thru the bracket and a nut and washer are used to hold that down. A bit of PB Blaster should help you remove what's left of them from below.

Sorry, don't know what size those bolts are (I think the heads are 10mm.) I snapped both lower ones when replacing the alternator a few months ago, and replaced them with SS bolts, nuts and washers at the time (I'm hoping stainless won't rust out too quickly from the heat.)
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Old 12 Oct 2016, 07:30 pm
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Default Re: Odd Noise - Loose EM Heat Shield?

Thanks! In one hole there does appear to be the remnants of a threaded stud. I wasn't able to get anything to loosen up at all. The other hole appears to be free of any blockage, but I can't seem to get the holes lined up to feed a bolt through both (wrestled too long with it, even managed to give some blood to the endeavor). Kids are driving the thing around the next couple of days, but I'll get in there with a light and try to figure something out.

Thanks again.
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