NHTSA Investigating Ford Explorers After Reports of Exhaust In the Cabin

Numerous reports of an exhaust smell in the cabin of late-model Ford Explorers prompted the National Highway Traffic Safety Administration to open an investigation.

According to Reuters (via Automotive News), safety officials began looking into 2011–2015 Explorers last Friday after receiving 154 complaints of an exhaust odor. The issue, which is reported to be a factor in one crash (that didn’t result in injuries), persists in some vehicles even after they were repaired to correct the problem.

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Piston Slap: Deep Six the 626?

Joey writes:

Hello Sajeev,

I’ve been a reader of yours for years and greatly enjoy your style. (Woot! —SM)

My question is about my ’97 Mazda 626, with a hair over 215,000 miles on it, that’s been in my family for its entire life. It’s reliable, economical, and generally in good condition.

However, I am up for a registration renewal in October, and I need to complete an emissions test. I figured that it would be a good idea to check up on the codes behind the check engine light. The codes came up as an evaporative system and catalytic converter errors, which are both emissions fails.

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Piston Slap: Prizm's Intelligence Gathering Leak?

Andrew writes:

Hi Sajeev,

I’m trying to wring a few more years out of my 1994 Geo Prizm, and recently the engine got louder. It’s a very low end bass like sound that makes the whole car vibrate a lot more.

The muffler and resonator are relatively new, and the noise seems localized to the front of the car. What’s odd is that the engine is the loudest when it’s idle. As soon as the RPMs go above 1500, the engine is only a little louder than it normally would be. How do I find out if the problem is the exhaust manifold, or the downpipe from the manifold to the catalytic converter? Over the summer there was a brief time when coolant was leaking and dripping down onto that downpipe and burning off. That leak issue was addressed, but that downpipe has some rusty sections on it anyway.

Sajeev answers:

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Piston Slap: An Accented Whooshing Sound?
TTAC commentator bumpy ii writes:

I have a 2007 Hyundai Accent 5-speed manual hatch. When I’m driving, sometimes I’ll hear a little ‘psssht’ noise as I pass through 2500 rpm. It almost sounds like a tiny blowoff valve under the car.

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  • EBFlex "I've only filled the gas tank three times in 2500 miles"Assuming you went from 0 gallons to full (17.2), you have averaged almost 50MPG over those 2500 miles. 50 MPG in a Jeep Wrangler. To all of you EV nut jobs, tell me again how PHEVs are not the absolute best thing to happen to automobiles since the wheel. And tell me how they don't make EVs look like the awful play toys that they are.
  • MRF 95 T-Bird The Buick 215/3.5-liter aluminum V8 was one of GMs great engines. Unfortunately GM being GM in one of their greatest mistakes was selling off the tooling to BL. If they kept it around and improved upon it it would have been a fine motor for their compacts and midsize models through the OPEC oil crisis.
  • Chris P Bacon Not sure why a '21 is getting reviewed, because there have been improvements to the 4xe. I've got a '22 4xe Sahara. May 2022 build in High-Velocity yellow with a soft top. As soon as it was announced I knew I wanted to try it, not for the fuel mileage, but for the technology. I don't have a Level 2 charger, it charges fully overnight on the included Level 1. I see an indicated range of 27 miles regularly. Today it indicated 29 when I unplugged. I've only filled the gas tank three times in 2500 miles, a full charge costs me about $3 based on my current electricity supplier. I don't experience the rough transitions between electric and gas, so maybe Jeep figured it out? It's stupid fast when using all the power off the line. So much so that it will break the rear wheels loose when you stomp on it. I agree that plugin hybrids are the future. I see no need for a pure electric. This is the way to go.
  • RHD The word B R O N C O written in contrasting paint on the dashboard is quite unnecessary. The passenger certainly knows what kind of vehicle he or she is in. That detail is a big fail. The red and white Bronco looks great, especially with tires that have honest-to-goodness sidewalls on them.
  • Luke42 Aren't those trim levels just different colors of paint?That's what they sound like, at least. 🤷‍♂️