7.3L Rough Idle/Knock, White Smoke when Cold, Loss of Power - Ford Powerstroke Diesel Forum
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Old 03-04-2014, 03:03 PM
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7.3L Rough Idle/Knock, White Smoke when Cold, Loss of Power

Symptoms:
-Rough idle/distinct knock that is worse when engine is cold
-Lots of white smoke on cold start (unplugged)
-Some white smoke when plugged in
-Strong smell of diesel at all times
-Loss of power
-Terrible fuel mileage

Timeline:
1) Excursion was filled with gasoline accidentally
2) Excursion was taken to diesel shop who put in:
-New OEM injectors
-Fuel filter
-Blew out all fuel lines
-All new glow plugs (unrelated to gas incident)
3) The truck ran great for a few days, but I ran it low on fuel to clear any gas left in the system, which led to it stalling
4) I filled it with diesel and it started fine, but idled slightly rough
-Also had battery light come on intermittently
5) I replaced the alternator after having it confirmed to be bad
-No change in idle
6) I drove the Excursion for months and the idle progressively got worse
7) I did research and found that the ICP could be the cause
-ICP had oil in connector (meaning bad), so it was replaced with OEM ICP and pigtail
-This quieted the idle, but the knock was still obvious
Throughout this time, the truck would smoke white at first startup of the day and smell strongly of diesel
-Lots of smoke if unplugged, until warm
-Less if plugged in, but still some initially
8) CPS was replaced with BWD one from O'Reilly, as it is a simple and cheap thing to try
-This made the engine run terribly, so I thought I got a bad CPS
9) Got another replacement BWD CPS and installed it
-Made it run terribly again, so re-installed OEM one
So, this is where I am now. I have a rough idle and distinct, rhythmic knock that is worse sometimes than others, but consistently gets better as the engine warms up. I have white smoke on start. I can smell diesel at all times if I'm outside of the cab. I'm getting horrible fuel mileage and have a loss of power.

Notes:
-Freshly changed oil/oil filter
-Have an oil leak that I can't trace, but always keep it topped off
-I have a TS Performance 6-pos. chip installed
-I do not have access to a scan tool with live data

Does anybody have suggestions on what to check next?
Could there be other things that the gas could have damaged that weren't replaced?
Does anybody know why it would run substantially worse with a new CPS?
-Could a new CPS amplify an existing problem?
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  #2  
Old 03-04-2014, 03:38 PM
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how long did you run it with gas? It could have melted your pistons....
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Old 03-04-2014, 03:47 PM
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The engine was run with gasoline for about 10 miles. The truck slowly started to run worse and worse as the fuel became more concentrated with gas rather than diesel. I didn't know that gas had been put in it. The shop that did the work on it did do a compression test, which they said checked out. I don't know if that tells you anything about melted pistons. But another notable thing is that after the work was done, it ran perfectly smooth until it ran out of fuel, making me think that there probably were no huge mechanical issues in the cylinders, but I am not certain.
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Old 03-04-2014, 03:59 PM
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Well without a scan tool you can only do so much. The mechanic put in new injectors?
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Old 03-04-2014, 04:05 PM
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Yeah, I know. I wish I knew somebody with a scan tool. And yeah, all new OEM injectors.
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Old 03-04-2014, 04:16 PM
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Quote:
Originally Posted by rdandres View Post
Yeah, I know. I wish I knew somebody with a scan tool. And yeah, all new OEM injectors.
Where are you located? There might be an org member near you who would help you.
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Old 03-04-2014, 04:17 PM
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That would be extremely nice! I live in Fort Collins, Colorado.
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Old 03-04-2014, 05:15 PM
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Pop your oil fill cap while its running. Does it have a lot of blow by? If so you have a washed/dusted cylinder which would explain your knock.


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Old 03-04-2014, 05:39 PM
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Quote:
Originally Posted by Ricemiester View Post
Pop your oil fill cap while its running. Does it have a lot of blow by? If so you have a washed/dusted cylinder which would explain your knock.

I'll check the blow by, but how much is a lot? If you unscrew it completely and the cap stay in the hole, is that good, or how do you judge?
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Old 03-04-2014, 06:06 PM
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Quote:
Originally Posted by rdandres View Post
I'll check the blow by, but how much is a lot? If you unscrew it completely and the cap stay in the hole, is that good, or how do you judge?
Turn the cap upside down, put it on top the hole and if it blows off theres a good chance that your motors dusted.
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bad fuel economy, cps cam position sensor, injector issues, rough idle, white smoke cold

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