Just got a 03 black Lightning with 82M. This is a major upgrade for me from a previous 99 F150 V6 that I've had for 10 yrs +.
Not familiar with the SC but it's making a loud humming noise after just a little boost. Sounds like a big cooling fan turns on right after the whine of the SC winds down. The sound goes away when I step on the gas or blip the throttle. I have a Mini Cooper S with the same water cooled SC but it doesn't make the loud humming noise.
I'm afraid the SC on the Lightning is busted ? Or is this normal?
Thanks for any info.

 

it's hard to diagnose with the lack of information you provided



#1 what mods are done to the truck? (it sounds to me like a vacuum line is on backwards or the accuator is inop)

#2 who tuned the truck?

#3 got any pics?

 

Thanks Tarajerame for your reply. I know it's hard to figure out since I can't reproduce the loud hum when it's stationary. I tried to rev the engine but no hum. Drove it today and seems that the hum is becoming more frequent.
The only mod that I can tell is a flowaster exhaust and cold air intake.
I got the truck in northern CA and drove it down to southern CA with no problem.
I don't know who tuned the truck, PO didn't provide this info.
I was driving today, making a sharp right turn and the engine suddenly died. It started right away with no problem.
I can take some pics but of what ? Anyway, I'll take some pics of the engine compartment tomorrow, maybe someone out there familiar with the engine can see something odd/unusual
I've been tinkering with cars since I was a teenager but never experienced this, maybe by posting here, someone with a similar problem can shed some light on where /what to look for.
Thank you.

 

vacum lines

pulleys

inlet system


is there any odd wires around the engine bay?


is the Eaton out of oil?


does the truck make wierd noises at idle? you might be experiencing a defective IAC (Idle Air Control)

 

I've added pics to my album.
Checked the SC oil, clean and full.
No problem with idle
In the pic there's what looks to me like an add on to the brake system (arrow). The black wire is disconnected, the red is attached to some kind of red warning light under the dash.When I asked PO about the red light under the dash, he said it's for some kind of anti towing device.
I'm going to try cycling Sea Foam through the intake. What do yo think ? Maybe the throttle is stuck?
The best way I can describe the sound is like a howling sound, or like when the aux fan turns on when it's hot. But the temp gauge is normal and not over heating.

 

DON'T USE SEAFOAM!!!

Use chevron techron or berrymans b12

TJ has given you some excellent tips....start with the IAC

 

Sea Foam is not good ? I'll give berrymans b12 a try.
Come to think of it, it can't be a stuck throttle since the throttle functions normally when the howling sound comes on

 

I'm still leaning towards a defective IAC

 

is the Eaton ported?? might be cavitation you are hearing...



does the truck pull like "normal" when it's making this noise?



is it a grinding howling noise or like a fog horn??

 

Tried to determine where the sound is coming from but it's hard to do since when I stop, put in Park, the noise stops. After carefully listening to the sound, it resembles more like air being sucked through the K&N air filter.
Got the berrymans b12 ad sprayed into the throttle body. Got service engine light on , hooked up the code reader, got P0113. Cleared the code.
Took off the IAC and cleaned with berrymans, plunger seems to be operating fine. Will test drive tomorrow.

I don't know if the Eaton is ported. What I noticed was when I turn the engine off, I can hear the eaton still spinning and air being sucked into the air filter. It's like the engine is taking it's last breath. This happens every time I shut off the engine.

The truck seems to run fine when the noise comes on but, I'm afraid it's going to blow up so once I hear the howl I ease off the gas. I'll try to keep the gas on next time. Will update after test drive tomorrow. Thanks again.

 

If you turn the engine off, the Eaton is not still spinning... You might hear vacuum for a short duration right after shut-off, but that is normal.

If the engine pulls fine and makes good power and there aren't any grinding noises, I'd suggest you look into the drive line and / or exhaust components.

There just aren't that many things to go wrong with the Eaton and the rest of the induction system.

Take those noisy Flowmasters off and you might find the issue AND you'll get your torque back to boot !! :-)

 

That's good to know, B-man. I'm not familiar with the eaton but on my cooper s, the sc shuts down immediately and all I hear is the whirring of the pump for the sc cooler after shut down.

I'll pay more attention to the driveline when I take her out today. Thanks

 

Good news !!! Seems like the noise is gone. Drove it for about 10 miles and so far so good. I'm still going to change the IAC though since I noticed when I have the AC on and just sitting at the traffic light the idle fluctuates up and down. Idle is fine when AC is off.

The tranny is also making a rumbling noise when in D, not in R or N. So, that'll be my next project.

What made you think of the IAC, tarajerame ?

Thank you guys for all your help.

 

experience


and the idle will fluxuate a bit when the a/c is on


sounds like the trans filter might have come loose...



that's why we're here

 

I'll do the tranny fluid/filter change today
Thanks for pm, one more important knowledge under my belt.