Cold start haze/smoke.

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Nov 6, 2024 | 04:07 PM

#16

bismic

Fleet Owner

Joined: Nov 2003

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Have you cleaned the MAF?

Nov 6, 2024 | 04:38 PM

#17

Fuzzpuss

Cargo Master

Joined: Nov 2015

Posts: 3,427

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From: Fort Worth, TX

Quote:

Originally Posted by wpg_250

If memory serves last time I checked baro/ebp/map they were within .2-.5 of eachother and I've cleaned the map sensor with map cleaner a few times now so pretty sure all that stuff is g2g.

Did you mean MAF sensor with MAF cleaner? Or is there a product that's specifically for cleaning MAP's?

Nov 6, 2024 | 04:39 PM

#18

Toreador_Diesel

FTE Leadership Emeritus

Joined: Sep 2003

Posts: 12,253

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From: Houston, Texas

While it's important to do the sensor dance, there is something to keep in mind:

The white smoke at idle on a cold day after the first start is actually normal. This is occurs in one of two scenarios:

-The truck is parked in a garage and someone backs it out and lets it idle in the driveway or going on a drive through the neighborhood.

-The truck is sitting out in the cold and then fired up after a cold soak in cold weather.

In both scenarios, the truck has to adjust fueling based on the temperature. The air temperature outside and the EOT. Once it adjusts fueling to match the air and engine temp, the white smoke subsides. This is normal. They talk about it in the "Things you need to know about your Powerstroke Diesel" video that came with these trucks new, that nobody watched. Except me

Basically, it's politely overfueling and makes adjustments so it doesn't do that. No need to worry.

Nov 6, 2024 | 04:43 PM

#19

bismic

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I pretty much agree, but I am happy that mine does not do that.

Nov 6, 2024 | 04:44 PM

#20

wpg_250

Thread Starter

Fleet Mechanic

Joined: Feb 2023

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Quote:

Originally Posted by Fuzzpuss

Did you mean MAF sensor with MAF cleaner? Or is there a product that's specifically for cleaning MAP's?

MAF yes. The sensor in the air intake assembly. The MAP is on the other side closer to the firewall correct? If so I've never inspected that physically and only gone by FORSCAN data. Brain fog today 😑

Nov 6, 2024 | 04:46 PM

#21

Fuzzpuss

Cargo Master

Joined: Nov 2015

Posts: 3,427

Likes: 939

From: Fort Worth, TX

Quote:

Originally Posted by bismic

Broadcast Message 5468 talks about a P0404 coming from a higher than expected EBP value, so I find it hard to think that an open exhaust system would cause a P0404.
.

Some vehicles may store EGR control performance code P0404. This occurs when the difference between commanded and actual EGR valve position is more than 10% for 10-15 seconds. This can be caused by voltage drop on the EGR control circuits, a sticking EGR valve, or excessive exhaust backpressure. Diagnose by checking for and addressing other codes. Perform the EGR valve active command test. If the valve passes the test, check for excessive exhaust backpressure from plugged exhaust system or sticking VGT vanes. Broadcast Message 5468.

.
IAT and MAF sensors can cause it though.

The actual EGR valve position is one of the pids that doesn't show, so there's no telling how it relates to commanded position.

I have three MAF sensors, two OE Ford's, and a Delphi that I bought three years ago. I have tried all of them with no change, as well as replacing the MAF pigtail. I guess it's time to look into the IAT2 circuit, because the sensor is only 3 months old.