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View Full Version : 1999 F350 Super Duty 7.3 With Turbo Issue


mustang512
February 15th, 2010, 12:49 PM
i have a 99 f350 superduty with a 7.3 and when the ambiant temp gets to below 50 degrees the turbo doesnt work right when it is not under a load but does if under a load

nine5flareside
February 15th, 2010, 04:06 PM
I would say to look at the sensor first. May be a faulty sensor.

mustang512
February 15th, 2010, 07:12 PM
which sensor r u recomending

Old Blue
February 15th, 2010, 08:36 PM
what do you mean by it not working right?

V8_Feller
February 15th, 2010, 08:39 PM
Are you building boost at all?

My 7.3 did this before it warmed up I would only throw a couple pounds of boost. Also I know back around then some F-150 sensers dont work well in the cold, I wonder if you got that?

Klitch
February 15th, 2010, 09:32 PM
the 7.3 likes to build heat by playing with the wastegate. is this the feeling your talking about?

JSoko
February 16th, 2010, 01:42 PM
Welcome to the site
send $$$ and in return I will ship Majic Wand
Are you running a Programer/tuner??

mustang512
February 16th, 2010, 04:01 PM
no i donnt have any programers and yes it is the waste gate isue but i dont no what to do about it

Lostin90s
February 16th, 2010, 04:47 PM
Welcome to FTC

Klitch
February 16th, 2010, 11:01 PM
no i donnt have any programers and yes it is the waste gate isue but i dont no what to do about it
I dont think you can get around that surging feeling your getting. Its trying to build the engine temperature. Does it go away when you've hit operating temperatures? If it doesn't then you may have a problem.

mustang512
February 17th, 2010, 04:06 PM
it doesnt mater if the engine is up to temp or not it comes on when u r driving down the road and the tk is not under a load u dont need to be off the throtle and it goes off as soon as u step down on it. it is like a jake brake u dont want. i have had the tk for 8 years so i now how it is suposed to run.

Klitch
February 17th, 2010, 08:13 PM
I dont have access to the familys SD so I cant be exact on my help right now. but I think there is a solenoid and some vacuum lines that are easy to reach, that take part in the waste gate control, check for leaks if you can to just verify thats not the problem.

mustang512
February 17th, 2010, 10:58 PM
i took and found that there is a line from the exh manofold to a what looks to be a pressure switch that has a hole in it that i am going to fix 2maroo. i am hoping that is it but with my luck its not.

catmechanic07
February 18th, 2010, 10:18 AM
i have a 99 f350 superduty with a 7.3 and when the ambiant temp gets to below 50 degrees the turbo doesnt work right when it is not under a load but does if under a load

:konfused: Hmmm! Does it show a C.E.L.? Could be the wastegate but highly unlikely. Could be an ambient temp sensor thats faulty. That sensor may not throw a CEL but its possible. Not sure how the system is set up on that truck. As said before, could be a vac line. Depending on how old the truck is, it may not even have a wastegate on it. Then again you said you had hoses going to the turbo so not really sure. Most of the wastegates I deal with are air operated and I know you dont have an air compressor for air brakes. So......I say Hmmmmmmm again! If it does have a WG....it could be seizing up and not traveling the correct distance or even possibly getting stuck. TOO MANY POSSIBILITIES!

JSoko
February 18th, 2010, 10:28 AM
just like majic, transfered to the correct place
and Cat is on the prowel
the '99 7.3 does have a waste gate

catmechanic07
February 18th, 2010, 10:35 AM
I always prowel when it involves a diesel. Just wish I could afford one!

mustang512
February 18th, 2010, 05:34 PM
hopefuly it is all better now i fixed that metal tube and took it for a short ride and it was allright.

JSoko
February 18th, 2010, 09:09 PM
hopefuly it is all better now i fixed that metal tube and took it for a short ride and it was allright.

triple double check THAT connection when cold
sleep tight
good moon under foot tonite