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Old 01-18-2012, 08:19 PM
98SurplusExpy 98SurplusExpy is online now
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Stong smell of unburned diesel from exhaust (not inside the cab)

For awhile now, I noticed a strong smell of unburned diesel coming from the exhaust. I don't smell this inside the cab; only at idle if I step out of the cab.

The smell is such that random folk have commented about it and suggested that I had a sticking injector ... but I have no symptoms of such, fule mileage is on par w/ other 6.0's, & I have no codes. My truck is stock other than a coolant filter.

Anybody else getting a strong scent of unburned diesel at idle??
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Old 01-18-2012, 09:12 PM
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Theres no way to know for sure if the smell is the same as mine over the internet, but a new EGR valve fixed it for me when my exhaust smelled like what you described.
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Old 01-19-2012, 04:42 PM
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Quote:
Originally Posted by 98SurplusExpy View Post
For awhile now, I noticed a strong smell of unburned diesel coming from the exhaust. I don't smell this inside the cab; only at idle if I step out of the cab.

The smell is such that random folk have commented about it and suggested that I had a sticking injector ... but I have no symptoms of such, fule mileage is on par w/ other 6.0's, & I have no codes. My truck is stock other than a coolant filter.
Fuel mileage is only part of the equation for checking for a leaking injector. Does the truck act like it's got a miss? If you've got an injector leaking a contribution/balance test with an AE will show which one it is. How about smoke out the tailpipe?
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Old 01-19-2012, 07:40 PM
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Fuel mileage is only part of the equation for checking for a leaking injector. Does the truck act like it's got a miss? If you've got an injector leaking a contribution/balance test with an AE will show which one it is. How about smoke out the tailpipe?
Engine runs pretty smooth ... only a romp & puff of smoke during a real cold morning start. No contribtion codes ... but I hadn't had a contribution test done in awhile.
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Old 01-19-2012, 09:20 PM
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Engine runs pretty smooth ... only a romp & puff of smoke during a real cold morning start. No contribtion codes ... but I hadn't had a contribution test done in awhile.
I'd get a contribution test run if your getting a strong smell of diesel out the tailpipe. Could have a cracked injector that's leaking excessive amounts of fuel. Left alone long enough might hydrolock,
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Old 01-20-2012, 08:37 PM
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I had a similar issue but i was smelling it inside and especially when i got out of the cab, mine was the fuel lines on the driver side of the motor had come loose, mechanic said he just had to replace a o-ring on one of the lines and the other just needed to be tightened up.
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Old 01-20-2012, 08:56 PM
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You know, I'm not saying you need to tear the bead off your truck...but I wonder if you have a fuel line leaking somewhere around the tank to HFCM? Could smell like raw fuel near the tailpipe if the wind was blowing the right way.
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Old 01-22-2014, 07:08 AM
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did you ever figure out what was going with the exhaust smell?
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Old 01-22-2014, 04:47 PM
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did you ever figure out what was going with the exhaust smell?
Not specifically; but, about 10-mos after this post I identified a raw-diesel leak at my fuel pressure regulator. I replaced the housing & gasket (did the blue-spring mod) and the odor diminished mostly.

I can still smell diesel exhaust when running ... I've mostly attributed it to just being the nature of the beast.
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Old 01-22-2014, 04:47 PM
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