Blue smoke
Posting Guru
Joined: Mar 2008
Posts: 1,669
Likes: 1
From: Billerica, MA
That sounds like injector o-rings to me. If the seals are bad then it will allow oil to pass by the injector and leak I to the combustion chamber and when it burns it burns blue. O-rings are fairly common on higher mileage motors and are quite simple to replace, it can be done start to finish in probably 4 hrs, + or - an hour or so depending on if you've done them before.
Postmaster
Joined: Jan 2004
Posts: 3,207
Likes: 0
From: Kearney, Nebr
x3 on o-rings. Unless it's happening during cold starts but clears up in a decent amount of time I wouldn't be worried about it.
If your choking out the entire yard I'd be concerned, but these older diesels do smoke a little on a cold start.
If your choking out the entire yard I'd be concerned, but these older diesels do smoke a little on a cold start.
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
So its got a embarrasing amount.
Lead Driver
Joined: May 2007
Posts: 8,608
Likes: 13
From: Belair md
if it is only while revving up on a hot engine and if you put it to the floor in park or neutral and the truck stumbles from 2500-3100 then it is 99.9% guranteed injector o-rings.
here are a few comaprison videos for you as far as cold start smoke goes. my truck has fully functional glow plugs and good solid compression.
this is a 2 day sit in mid 30's- YouTube - cold day truck start
this is a 2 hour sit in mid teen weather- YouTube - 2 hour sit in cold weather
here are a few comaprison videos for you as far as cold start smoke goes. my truck has fully functional glow plugs and good solid compression.
this is a 2 day sit in mid 30's- YouTube - cold day truck start
this is a 2 hour sit in mid teen weather- YouTube - 2 hour sit in cold weather
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
if it is only while revving up on a hot engine and if you put it to the floor in park or neutral and the truck stumbles from 2500-3100 then it is 99.9% guranteed injector o-rings.
here are a few comaprison videos for you as far as cold start smoke goes. my truck has fully functional glow plugs and good solid compression.
this is a 2 day sit in mid 30's- YouTube - cold day truck start
this is a 2 hour sit in mid teen weather- YouTube - 2 hour sit in cold weather
here are a few comaprison videos for you as far as cold start smoke goes. my truck has fully functional glow plugs and good solid compression.
this is a 2 day sit in mid 30's- YouTube - cold day truck start
this is a 2 hour sit in mid teen weather- YouTube - 2 hour sit in cold weather
I let the oil pressure get up them rev it up some and theres a cloud of blue.
Truck seems to stumble while doing it.
Ive got the truck here and thinking about buying it and trying to figure out how much work its going to need.
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Lead Driver
Joined: May 2007
Posts: 8,608
Likes: 13
From: Belair md
you cant judge rough accel on cold oil. the engine has to be up to operating temps. i have yet to see a 7.3 that didnt have some form of white/blue smoke on cold start.
if it still stumbles on a hot engine and has the smoke then you are most likely looking at injector o-rings. you can get a whole set for under 100 bucks and about a day to replace them for the first timer
if it still stumbles on a hot engine and has the smoke then you are most likely looking at injector o-rings. you can get a whole set for under 100 bucks and about a day to replace them for the first timer
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
you cant judge rough accel on cold oil. the engine has to be up to operating temps. i have yet to see a 7.3 that didnt have some form of white/blue smoke on cold start.
if it still stumbles on a hot engine and has the smoke then you are most likely looking at injector o-rings. you can get a whole set for under 100 bucks and about a day to replace them for the first timer
if it still stumbles on a hot engine and has the smoke then you are most likely looking at injector o-rings. you can get a whole set for under 100 bucks and about a day to replace them for the first timer
Ill let the truck warm up real good tomorrow and see what it does when I rev it up.
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