For years, Nissan Rogues across America have taunted me with what—from a distance—looks like a heat exchanger under their rear fascias.
Well, after finally looking at a Rogue up close, and talking with Nissan, I have the answer. It was time to stalk one of these crossovers, get up close, and find out once and for all what this heat-exchanger-looking thing was.
But looking at this component carefully, it was clear that this bit of metal was not there to protect plastic from thermal degradation. As such, I ruled out the heat shield thing. Upon closer inspection, it became apparent that this shield—bolted to the muffler—served an aerodynamic purpose.
Today, a Nissan representative confirmed my theory, though he would not divulge how many counts drag coefficient thousandths the formed piece of sheetmetal reduced. There is not. There, now we can all once again enjoy full nights of toss and turn-less sleep. Technical Editor, Jalopnik. Always interested in hearing from auto engineers—email me.
The A. David Tracy. Filed to: Nissan Rogue. Nissan Rogue Nissan Rogue. David Tracy Posts Email Twitter. Share This Story.
Get our newsletter Subscribe.Modern internal combustion engines generate a considerable amount of heat during their regular operation. External engine temperatures routinely reach upwards of nine hundred degrees fahrenheit, which is hot enough to be hazardous to engine components if the heat is not managed properly.
A majority of that heat is released by the exhaust manifold, the metal pipe through which the exhaust gases exit the engine.
In order to prevent this extreme heat from damaging the components under the hood, a heat shield is used to help manage and contain the high temperatures. Most heat shields consist of one or more layers of stamped metal that are shaped into a shield that is designed to wrap around the exhaust manifold. The shield acts as a barrier and heat sink, preventing the heat from the manifold from reaching any of the components under the hood and potentially causing damage. While most heat shields will generally last the life of the vehicleor at least the engine, they can sometimes encounter issues which require service.
Usually a bad or failing heat shield will produce a few symptoms that can alert the driver of a potential issue. One of the first symptoms of an issue with the heat shield is excessive heat from the engine bay. If the heat shield fails to provide protection against the heat generated by the engine bay for any reason, such as it becoming damaged, or loose, that heat will soak into the engine bay.
This will cause the engine bay to become hotter than normal. In some cases the hood may even become hot to the touch, from soaking up the excessive heat.
Another symptom of a bad or failing heat shield is a burning smell from the engine bay. If the heat shield fails to protect the engine bay from the exhaust heat it may eventually lead to a burning smell from the engine bay. If the heat reaches any plastic, or especially sensitive components it may cause them to overheat and burn up. This will produce a burning smelland in some cases even smokeaside from potentially damaging the affected component.
Another, more audible, symptom of a bad or failing heat shield is rattling noises from the engine bay. If the heat shield becomes loose, damaged or broken, perhaps due to loose hardware or damage from rust, it will cause the heat shield to vibrate and produce a rattling sound.
The rattling will be most prominent at low engine speeds, and may change in pitch or tone according to engine speed. A close inspection would be required to determine if the rattling noises are from a broken, or simply loose, heat shield.
While most heat shields will last the life of the vehicle that does not mean that they are not susceptible to failure. If you suspect that your heat shield may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the shield should be replaced. Our certified mobile mechanics make house calls in over 2, U.
Fast, free online quotes for your car repair. Excessive heat from the engine bay One of the first symptoms of an issue with the heat shield is excessive heat from the engine bay. Burning smell Another symptom of a bad or failing heat shield is a burning smell from the engine bay. Rattling noises from the engine bay Another, more audible, symptom of a bad or failing heat shield is rattling noises from the engine bay. Schedule Exhaust System Inspection.
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Join Us! Bob K. Heat shield s rattle on cold start up.
Nissan-Rogue Catalytic Converter: Price, Location, and Diagnosis
I have a sheet metal rattling sound upon cold start up. Is this common? I mean, is there any particular shield I should look at first? It rattles for about 15 seconds and then goes away until the first acceleration and then I can hear it again. After that there is no detectable noise at any time. Any ideas are welcome. Thanks Bob K.Issc m22 canada
There is a shield on the front exhaust tube that is welded on. The weld breaks and causes the rattle. We just put a hose clamp around it to re secure it.
Nissan Rogue repairs by problem area
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Datsun B. Murano I. Fairlady Z. Pathfinder I. Patrol GR.Your Nissan Rogue leaves the factory with a catalytic converter. It takes the emissions gases that are a bi product of the normal combustion process and reduces them down to levels that meet federal emissions regulations. They have gotten better at what they do from an exhaust flow perspective, and an exhaust cleansing perspective. The exact location of the catalytic converter is going to depend on the model year and engine size of your Nissan Rogue.
But, they are not that difficult to locate. The catalytic converter itself is a part of the exhaust system. They almost always have a heat shield around them and an oxygen sensor somewhere before them. It is necessary for the catalytic converter to be before the muffler. The muffler is really the only thing that you can confuse for the catalytic converter on your Nissan Rogue. The catalytic converter may be bolted or welded on depending on the year and make of the vehicle.
The catalytic converter for your Rogues cost will vary by model year and engine size. But, as a rule catalytic converters are not cheap.
They are one of the most stolen items on a vehicle there is. It is not uncommon for the catalytic converter to fail, as the years and mileage take their toll. When your Rogue has a major engine problem, the check engine light will begin flashing.
In most cases, this flashing condition occurs to help try and save the catalytic converter. Most of the symptoms of a bad catalytic converter have to do with the lack of exhaust flow through the Cat.
Once it gets so clogged, your Rogue will be barely drivable. It can be an expensive repair. If you feel like there is anything that you can add to the discussion, please leave a comment below. Good luck fixing your issue!Worried about potential repair costs?
An extended warranty can provide peace of mind. See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. To see how frequently Nissan Rogue problems occur, check out our car reliability stats. All years. Nissan Rogue repairs by problem area. Nissan Rogue engine repair cost distribution.
See most expensive repairs Worried about potential repair costs? Chart based on repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.
Mechanic took a ride and it was a loose deflector on the underbody that they fixed. EPA: 33 highway, 26 city, 28 overall. Dealer states nothing is wrong. Easy fix Browns Mission is a poor dealership. Avoid this dealership. This was noticed by the buyer, I subsequently cleaned the throttle body and restored a smooth and satisfactory idle for the buyer, sale completed. I've noticed no change. Was making a grinding noise. Replaced Tensioner Pulley.
Pulley had play in bearing. First time that happen, I always wash the engine on every oil change. Got a code P, reset the light, after letting engine dry completely misfire was gone, however a hesitation occurred every time car accelerated mid throttle. Even though probably only 3 cylinder ignition coil was defective, I opted to change all 4 ignition coils.
Hesitation gone, Problem solved. Noted a leak in the radiator cap neck. When pressure built, coolant started leaking in the plastic weld line. Replaced radiator with a new one. Replaced with OE Parts Hitachi. I turned power off, pressed parking brake, released parking brake, started engine, all the warning lights turned off except for "service engine soon".
This happened four more times in next 24 h. They tried to fix it by adjusting the idle, however that didn't fix it. Determined it to be felt only when AC Unit was kicking in.
No real engine misfire was found. The tow driver started the car by completely flooring the gas pedal and it was driven to a repair shop for diagnostics. The radiator replaced a month prior started to leak at seam. Dealer replaced under warranty again. Replaced entire piece. Shop did not bother to go into details, did Air Intake relearn and said "They all do it".
Launched a complaint with Nissan Corporate and they are looking into it.One of the exhaust heat shields fell off my Honda Civic Hatchback a while ago. The dealer told me not to bother putting it back on or replacing it, because I don't need it anyway.
B After the heat shield had been gone for nearly a year, my exhaust manifold cracked. Could the missing heat shield have hastened the failure of the manifold? TOM: To answer your second question first, the heat shield had nothing to do with the cracked manifold.
So forget about that. RAY: Why do they put heat shields on cars?
C'mon, Holly. There are lots of car parts that do nothing but rattle and fall off. Why pick on the heat shield? The heat-shield manufacturers have to eat, too! TOM: The heat shields are actually metal guards that surround the various pieces of your exhaust system. They're there to shield other stuff from the excessive heat given off by the exhaust. RAY: There are top and bottom shields.
The bottom shields are there so that if you park on tall, dry grass or some other combustible material, your degree exhaust system won't set stuff under the car on fire. It doesn't happen often, but it can. And when it does, it's very exciting! TOM: On top, the heat shield prevents the heat of the exhaust from going upward, toward the floor of your car. And depending on which piece of the heat shield is missing, that could cause the bushings in your shifter to dry out, or the bottom of your sneakers to melt and become one with the carpet.
RAY: The heat shield is made up of a bunch of cheap, thin pieces of sheet metal that are welded in place. And since they're all under the car and constantly exposed to the elements, they're particularly vulnerable to rusting and breaking loose.S475 turbo kit
TOM: Our lawyers tell us that we must always replace rattling or missing pieces of the heat shield. Because they say they're already too busy defending us against libel lawsuits from the carmakers, and they don't have time to defend us on the off chance that some guy's dead day lilies, and the rest of his neighborhood, go up in flames. Not to mention his car. RAY: But we know there are lots of people who choose not to replace heat shields. TOM: And your dealer might know that -- based on the area in which you live, the kind of driving you do or your preference for asbestos-toed shoes -- your car might be fine without one particular piece of the heat shield.
If you're not permanently melted to the floor of the car, write back in a few years and let us know if he was right, will ya?
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