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Old 11-03-2011, 01:57 PM
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Expected Behavior?

Hey all, I finally have my 7.3 running great and now have a question. I have noticed that when coasting downhill with my foot completely removed from the throttle my rig occasionally sounds like an old big block with a big ol' cam in it. Kind of sounds all lopey and if I blip the throttle it responds perfectly and does not shake while doing this and get no SES light or anything. Is this an expected behavior? Thanks!!

Nick
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Old 11-03-2011, 02:07 PM
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do you have overdrive disabled when you hear it - around 35 - 40 mph?

mine does it too. I think it's the transmission (maybe torque converter) doing a little engine breaking. I don't think it's anything to worry about.

Try it with overdrive enabled - see if it goes away.
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Old 11-03-2011, 02:09 PM
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Today it was with OD enabled but I was only doing about 30 or so, so the transmission had not shifted up to 5th yet. In the past I have noticed it with OD off as well.
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Old 11-03-2011, 02:22 PM
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While coasting down a hill, your injectors will actually stop firing sometimes. It's probably just them going off and on.

Last edited by Zaairman; 11-03-2011 at 04:15 PM.
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Old 11-03-2011, 04:10 PM
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Mine does this only sometimes when shifting from OD(4th) to 3rd gear.
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Old 11-03-2011, 07:27 PM
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Yea, you are inbetween the injectors shutting off and on.
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Old 11-03-2011, 10:51 PM
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Yup, normal.. cool noise when they do that aint it? lol
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Old 11-04-2011, 04:29 PM
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Quote:
Originally Posted by Dietoremain View Post
Yup, normal.. cool noise when they do that aint it? lol
Sure is! My 6.0 it is on then off clear as day. The 7.3, you can hear it going back and forth. Sounds bad ***.

Well, not as good as my 312 Fairlane popping down hill but whatever.
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Old 11-07-2011, 05:03 PM
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Yes, sounds very cool (now that i know what it is). This will in now way harm the engine, will it? It seems to happen everyday on the same hill every morning. Thanks for the clarification too. This place is awesome!!
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Old 11-07-2011, 05:08 PM
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It's totally normal, nothing to worry about.
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