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Old 07-23-2008, 01:50 PM   #1 (permalink)
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Question Interesting Observation

About two weeks ago I left a post about my engine shutting off as I exited from highway speed onto an exit ramp. It happend twice. I just kept the clutch in, hit the ignition and it started right back up.

When I exit, I generally just hold the clutch in, brake, and cycle thru the gears as I'm slowing. Then I'm always in the right gear when I'm ready to hit the throttle again.

Anyway, today I noticed that as I was exiting and slowing from about 60mph, my RPMs dropped to almost zero. The clutch was in, so it couldn't have been engine braking.

I'm wondering if that's why my engine died last time. Is is possible that the RPMs dropped so low that the engine stalled out. Why would that be?

Any thoughts?
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Old 07-23-2008, 01:56 PM   #2 (permalink)
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Sounds highly likely, not sure what would cause it especially since it is throttle-by-wire
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Old 07-23-2008, 05:20 PM   #3 (permalink)
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same thing happens to me, 06 6mt Coupe
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Old 07-24-2008, 01:16 AM   #4 (permalink)
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Default interesting observation

same thing happened to my 04 6mt.dealer replaced throttlebody and had to reset the idle
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Old 07-24-2008, 02:33 PM   #5 (permalink)
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That would be a warranty item right?

My factory warranty is expired, but I've got an extended warranty from carmax when I bought the vehicle. As long as the problem is something the factory warranty would cover, carmax will fix it for a $50 service charge. Or I can take it to an authorized infinity dealer for repair and I pay 75$.
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Old 07-25-2008, 11:20 AM   #6 (permalink)
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have you installed an aftermarket air intake setup? i only noticed this issue after installing my ztube and stillen airbox with k&n cone filter
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Old 07-31-2008, 12:35 PM   #7 (permalink)
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Problem solved! I decided to actually take a look under the hood and much to my surprise the plastic air duct had come loose at the throttle body. Looks like the clamp holding everthing together just got tired and quit. The duct and the throttle body were kind of lined up, but not really connected. So, I guess at speed the engine was taking in enough air, but with a quick deceleration the engine starved for air and shut down.
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Old 07-31-2008, 12:55 PM   #8 (permalink)
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Originally Posted by natemid View Post
Problem solved! I decided to actually take a look under the hood and much to my surprise the plastic air duct had come loose at the throttle body. Looks like the clamp holding everthing together just got tired and quit. The duct and the throttle body were kind of lined up, but not really connected. So, I guess at speed the engine was taking in enough air, but with a quick deceleration the engine starved for air and shut down.
IDK, that's kinda weird. If the duct was loose, wouldn't it just be sucking in more air??........ since it would be drawing it straight and unrestricted (and unfiltered..YUCK!) from the outside air. Not saying it's not involved, but I doubt it's because it was starved for any intake air. If I found I was running without filtration, I'd do an immediate oil change and think about cleaning the MAF.

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Old 07-31-2008, 07:13 PM   #9 (permalink)
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It might be that the negative pressure created when you slowed caused the loss of air to your intake system. It's basically the ram-air effect backwards that could have caused your motor to die. You might have the TB problem somebody else stated too so I'd have the dealer take a look at that too.
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Old 07-31-2008, 10:32 PM   #10 (permalink)
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sounds like an idle sensor problem. it's right next to the throttle body.



the general symptoms for idle sensor failure is every once in a while, your car's RPM's will completely drop to, or close to, 0. this will start out happening once a blue moon. then, it gradually become a weekly problem, until it finally becomes an issue in which your car can barely drive because of it.


it could also be a faulty MAF sensor. try taking out the MAF and cleaning it.
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Old 07-31-2008, 10:34 PM   #11 (permalink)
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Originally Posted by natemid View Post
Problem solved! I decided to actually take a look under the hood and much to my surprise the plastic air duct had come loose at the throttle body. Looks like the clamp holding everthing together just got tired and quit. The duct and the throttle body were kind of lined up, but not really connected. So, I guess at speed the engine was taking in enough air, but with a quick deceleration the engine starved for air and shut down.

when your arm intake is off, if anything, you should be sucking up even MORE air, not less.
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