7 Strange Smells That May Mean Your Car Is Sick - Mercedes Benz SLK Forum
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#1 Old 09-11-2015
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7 Strange Smells That May Mean Your Car Is Sick

When it comes to your car’s health, you may want to pay attention to what the nose knows.

Bad smells – no, not those lingering aromas of old fast-food or dirty dog – can tell you there’s something wrong with the vehicle. The Car Care Council (CCC), a trade group that routinely recommends auto upkeep, warns that whiffs of rotten eggs or burning carpet, among other queasy odors, could signal mechanical problems that may lead to costly repairs or put you in danger of causing an accident.

“When you smell any peculiar odor, you should not ignore it,” says Rich White, the CCC’s executive director. “Instead, bring your vehicle to a professional service technician that you trust to get an informed opinion on the nature of the odor.”

If your engine seizes or your truck catches on fire due to a mechanical problem, you may be wondering if your car insurance will pay for the damages. Standard policies typically don’t cover equipment failure. Mechanical breakdown insurance covers your car’s mechanical parts that break in events not related to an accident.

Regardless of whether you have mechanical breakdown insurance or not, White, the CCC and other car experts advise heading to the garage if a sniff test registers any of these first six warning signals (the seventh you can probably remedy yourself):



1. Rotten eggs
White says this smell shouldn’t be ignored because it likely indicates a poorly running engine and catalytic converter issues.

“It’s never a good one,” the CCC notes, “and could mean a problem with your catalytic converter not converting the hydrogen sulfide in the exhaust to sulfur dioxide properly.”

Not checked, it may lead to a catalytic converter “meltdown” - and a costly repair.



2. Burning carpet
This is another one to pay special attention to because the odor could be a sign of brake trouble.

“Have your brakes checked right away, especially if this smell is happening during normal driving conditions,” White says.



3. Sweet syrup
It may mean that engine coolant is leaking from the cooling system, which could trigger a catastrophic breakdown if the vehicle overheats.

If you decide to check the radiator fluid level yourself, be sure to remove the radiator cap only after the car has cooled down, says the CCC.



4. Burned rubber
Slipping drive belts or loose hoses that might be rubbing against rotating accessory drive pulleys could cause this stink. Again, check for yourself only when the engine has cooled.



5. Hot oil
It may mean oil is leaking onto the exhaust system.

To verify a leak, White says to look for oil on the pavement or smoke coming from the engine area.



It’s common, of course, to catch the scent of gas while filling up at the gas station. But if you smell it often, it may be signaling a gas leak, probably in the fuel injector line or gas tank.

“Any smell of fuel can result in a possible fire hazard, so immediate attention should be given,” the council warns.



7. Musty gym locker
File this one under annoying, not hazardous. Popular Mechanics says that if you get this stink after turning on the air conditioner or heater, the culprit is likely mildew growing in the moisture condensing inside your a/c evaporator.

“Cheap solution: Turn off the a/c a mile from home and run the fan on high to dry the system out,” according to the magazine’s website.
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