White Smoke Rough Idle - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 12-09-2019, 10:55 AM Thread Starter
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White Smoke Rough Idle

Was about to run errands and when starting truck was a bit sluggish. Outside temp was around 70į though it's been dropping down into the low 50s/40s overnight. Didn't have block heater plugged in.

When finally started was running a little rough and a lot of white smoke coming out of the tail pipe. Turned it off and plugged in the block heater for a couple hours, cranked right up but still a lot of white smoke and a rough idle. Smoke is really eye stinging. At idle it comes out the tail pipe in puffs like my truck is sending out smoke signals

I'm assuming injectors or injector o-rings. Buzz test was ok. Just replaced injector #5 a couple months ago.

Anything else I should check to rule out besides the Injectors. Any way to tell if it's just one injector or if I"m gonna take the VC off just do them all, with them being this old and with this many miles on them.

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post #2 of 9 Old 12-09-2019, 11:29 AM
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The engine crank over evenly? no skips or humps?

if the smoke out the exhaust smells like raw fuel, then it is a compression problem

Good on you for testing with the block heater -- but should never need that in normal circumstances in Texas
Glow plugs should do all you will need -- are they working?

In my defense, I was unsupervised
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post #3 of 9 Old 12-09-2019, 11:42 AM Thread Starter
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Quote:
Originally Posted by Hydro View Post
The engine crank over evenly? no skips or humps?
after being on the block heater it did. initually was a slow sluggish start. noticed last year during winter weather, even in texas I would need the block heater when temps start hitting 40s

replaced glow plugs at 3, 5, and 7 when injector 5 was replaced. glow plug on number 1 broke when being replaced, broke off tip still stuck in there. shop wanted 1800 to pull the heads, which i didn't have.

was planning on doing the other bank glow plugs, but just hadn't gotten around to it yet

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post #4 of 9 Old 12-09-2019, 02:45 PM
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Unplug the big square wire connection with the 10mm bolt holding it together and crank the truck. Listen to the rpms, this will tell you if you have a compression problem because the injectors wonít be firing


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post #5 of 9 Old 12-09-2019, 03:38 PM Thread Starter
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Originally Posted by 7.3_TurboDiesel View Post
Unplug the big square wire connection with the 10mm bolt holding it together and crank the truck. Listen to the rpms, this will tell you if you have a compression problem because the injectors wonít be firing
Sorry, which wire are you meaning? The connection to the uvch? And what should I expect the rpms to be doing?
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post #6 of 9 Old 12-09-2019, 07:07 PM
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He means the connector over the driver side valve cover. Its in a metal bracket. Plug is squate and has a 10mm bolt in it. See pic
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post #7 of 9 Old 12-09-2019, 08:00 PM
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Yes thatís the connector meant, sorry I didnít clarify. I was preoccupied when I typed that


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post #8 of 9 Old 12-10-2019, 02:11 PM
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Does the smoke clear up once the engine is warm? If so it could be glow plugs, relay, or even armature clearance issues.

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post #9 of 9 Old 12-11-2019, 01:08 AM Thread Starter
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Originally Posted by greenskeeper View Post
Does the smoke clear up once the engine is warm? If so it could be glow plugs, relay, or even armature clearance issues.
No. Smoke never stopped once engine is at temp

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