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Old 11-07-2016, 07:20 PM   #1
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T444E no turbo for the first couple minutes on the road

I thought it was an ambient temperature issue because it would only have issues on days less than 40 degrees. I start the bus, run it for a half hour or take off right away, if I let it run for a half hour, it would take about a mile for the turbo to kick in, the same thing if I start it and take off right away. Well today it was 60+ out, I took off after about 5 minutes of warm up, it took a mile and a half for the turbo to kick in.
When I say the turbo kicking in, I mean it's like it's not getting high rpm power. taking off it's almost normal when I step on the gas, when I get up to 20-25, it sounds like there is a high pressure air leak coming out of the passenger side of the bus while I am stepping on the throttle.
I repeatedly let off the throttle and put it to the floor until I get full power, then it's running correctly for the rest of the day. I had this problem right before a long trip, I went 250 to the sugar beet harvest, 250 back then 1200 miles to my parents.
The only thing I can come up with is a post on google about a turbo boost sensor which would make sense. If it's not getting the right values, it wouldn't put fuel to the turbo. Am I on the right track? I am thinking I can hook up my own boost gauge, see what I'm getting. I don't have a computer to hook up. another question, does anyone have a picture and location of this boost sensor on the t444e? I can see what I'm getting for voltage when it's working and when it's not if I knew what to hook up to.
Thanks in advance,
Dave
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Old 11-07-2016, 08:35 PM   #2
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I'm assuming the T444 turbo is set up the same as the Ford 7.3l.

Have you looked at the turbo connections? Hearing an air leak and low power suggests a leak in the "up pipes" running from the exhaust manifolds to the turbo inlet or possibly bad rubber boots between the turbo and the heads. In the ford version of the engine those connections are known to degrade and leak over time.

Since the problem gets better when the engine warms up I'd guess it's the up pipe donut seals going south. If that's the case get new "bellowed" pipes to fix the problem for good.
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Old 11-07-2016, 08:59 PM   #3
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dont some of the T-444E's have a turbo exhaust backpressure valve that operates.. (and loves to malfunction) when the engine is cold? I have yet to see whether my T444e has one or not since it came from Texas.. but ive read bits and pieces online about them and their issues..

-Christopher
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Old 11-07-2016, 09:16 PM   #4
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Quote:
Originally Posted by cadillackid View Post
dont some of the T-444E's have a turbo exhaust backpressure valve that operates.. (and loves to malfunction) when the engine is cold? I have yet to see whether my T444e has one or not since it came from Texas.. but ive read bits and pieces online about them and their issues..

-Christopher
Good catch. That's another possibility. Probably the right one. What sounds like an air leak might actually be that valve closed down. I removed my valve and the oil-leaky pedestal actuator when I rebuilt the turbo.
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Old 11-08-2016, 07:49 AM   #5
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Thank you both, it gives me a better direction to go in. I'll let you know which one solved my issue.




Quote:
Originally Posted by roach711 View Post
Good catch. That's another possibility. Probably the right one. What sounds like an air leak might actually be that valve closed down. I removed my valve and the oil-leaky pedestal actuator when I rebuilt the turbo.
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Old 11-08-2016, 09:10 AM   #6
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If those don't turn anything up, check your wastegate also.

Could be sticking open.
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Old 11-08-2016, 09:15 AM   #7
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where is the wastegate on the T-444E?
-Christopher
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Old 11-08-2016, 09:16 AM   #8
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Start by getting a boost gauge then you know for sure what your pressure is, I would get a scan gauge it will give more info as well as codes
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Old 11-08-2016, 09:19 AM   #9
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if you get a scangauge besure to get the scangauge D, thats the J1708 compatible version.
-Christopher
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Old 11-08-2016, 09:30 AM   #10
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Quote:
Originally Posted by cadillackid View Post
where is the wastegate on the T-444E?
-Christopher
No idea. I don't have intimate knowledge of that particular engine.

I was just speaking from a general diesel troubleshooting perspective.
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