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JoeHEB1
Advanced Member

498 Posts
Posted - 03/20/2014 :  04:14:26 AM  Show Profile  Visit JoeHEB1's Homepage  Reply with Quote
I have a 2008 IC bus with a VT365, it's blowing white smoke at idle and black smoke while driving. I have 4 injectors that are'nt firing, and a loud knock in the engine. My question is, will it smoke that much with 4 injectors out and have a loud knock? I just replaced injectors on a VT365 that had 2 injectors out and it didn't smoke or knock like this one does with 4 injectors out. I've never come across this kind of knock on a VT365. I hope someone can chime in. Thanks.

Tb4020
Senior Member

United States
82 Posts
Posted - 03/20/2014 :  04:45:08 AM  Show Profile  Reply with Quote
It's probably fuel knock one of those injectors is probably just dumping fuel in and not really firing.
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JoeHEB1
Advanced Member

498 Posts
Posted - 03/20/2014 :  07:54:38 AM  Show Profile  Visit JoeHEB1's Homepage  Reply with Quote
Sounds logical. I'm replacing all injectors if budget allows and keep y'all posted. Thanks.
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Winn10
Active Member

49 Posts
Posted - 03/20/2014 :  2:30:47 PM  Show Profile  Visit Winn10's Homepage  Reply with Quote
I agree with tb4020. when you pull the injectors you may find a loose injector hold down. if so be sure to check/get the all pieces of the copper gasket out of the injector cup.
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Bassman
Top Member

USA
558 Posts
Posted - 03/21/2014 :  03:12:26 AM  Show Profile  Reply with Quote
Ditto on the fuel knock. But white smoke at idle on VT can be EGR cooler too.
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JoeHEB1
Advanced Member

498 Posts
Posted - 03/21/2014 :  04:08:40 AM  Show Profile  Visit JoeHEB1's Homepage  Reply with Quote
That was my first thought, but it's not using any coolant. I'll be tearing it down today and keep y'all posted.
quote:
Originally posted by Bassman

Ditto on the fuel knock. But white smoke at idle on VT can be EGR cooler too.
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JoeHEB1
Advanced Member

498 Posts
Posted - 03/28/2014 :  05:00:36 AM  Show Profile  Visit JoeHEB1's Homepage  Reply with Quote
Update: replacing all injectors fixed the smoking and knocking issues. I've never had 4 injectors go out all at once, usually 1 or 2. Thanks for all who chimed in on this.
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mastertech
Advanced Member

274 Posts
Posted - 03/31/2014 :  6:48:15 PM  Show Profile  Visit mastertech's Homepage  Reply with Quote
If you have a bad injector pintle letting compresion back into the fuel system it most certainly will wipe out all the injectors on that bank. Ive seen it several times.
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JoeHEB1
Advanced Member

498 Posts
Posted - 04/01/2014 :  06:33:21 AM  Show Profile  Visit JoeHEB1's Homepage  Reply with Quote
@mastertech thanks for the useful info, this is a first for me. Now I understand how so many can go out at once.
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