'01 F-350 SD 4X4 6-speed 185K miles


So I installed the S&B cold air intake on my truck today. Then went for a test drive and after driving about 15 miles the turbo isn't working like it was. I am not getting hardly any boost pressure on my gauge and it is lacking in power. I noticed also when I tach up the engine and let off to shift I can hear a strange whining noise from under the hood. All connections from the air box to the turbo are secure. All electrical connections are connected. Have to tach the engine to about 1500 RPM before I get any boost pressure then it will only go up to about 8 PSI at 2500 RPM. Everything is clean inside the turbo. No dust and just a minimal amount of oil. Before the air box change it would idle with almost 1 PSI pressure. Could this be a turbo failure? I'm afraid to drive it like it is. Don't want to cause any more problems.


I started a thread about my turbo wheel before the air box change here: https://www.ford-trucks.com/forums/1...l#post15306539


If anyone has any input on this I would greatly appreciate it!

 

Also, no smoke or oil from exhaust.

 

 

Try this , remove the tube that is connected to the turbo intake and see if the compressor wheel spins freely. Then start it up and let her idle and watch the turbo wheel spin.

Can you can feel suction when you put your palm close to the turbo intake?

 

I removed the tube after test drive and felt the wheel. It turned freely and didn't have any side to side or in and out play. Started it up with the tube off and it was spinning. I didn't check to see if it had and suction at the turbo intake but I did check with the tube connected and with the filter on it and I could feel it pulling air through the filter.

 

May be a stupid question and I'm not familiar with the S&B but does it come with some sort of plug or cover or plastic wrap for shipping that needs to be removed? Are getting air through the new box into the turbo intake?

 

How about the boots on the spider? Did any of those somehow come loose?

 

All shipping wrap removed and no plugs or anything in the tubes. I can feel it pulling air into the filter. Could it be a stuck valve on the turbo or something like that?

 

Checked that too. All connected.

 

Try pulling the filter element off, then when its idling put your palm over the tube and it should pull your palm like a vacuum cleaner.

 

yea, be sure to do this at the element end of the intake tube, would not recommend doing at the turbo inlet. I know a guy who got the tips of two fingers chopped off from a turbo on a big detroit on a shrimp boat. Just words of caution, please carry on....

 

Ouch. Bet he couldn't peel shrimp for a few days.

 

I have to ask.... 8 PSI boost at 2500 RPM - is that Wide Open Throttle? Where are you getting the boost reading, a gauge or the OBDII port? Was any other service work done in there while you were replacing the intake? What did you do with the green line to the intake boot? Was the turbo weak right away, or after the 15 miles you mentioned?

 

subscribing...zf6 here, l99...same boost numbers and noise..been fighting it since 11'

 

I'm wondering if the failure isn't in the boost line and lower boost numbers making you feel like there's a problem that isn't there. I have that same whining sound when the tranny shifts. I am under the impression that it is the turbo and that it is normal for the equipment on the truck.