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HELP! Turbo?Y Pipe? Air Filter Howling and Squeal? CAN'T FIGURE OUT!!!
For the life of me I can't figure out what exactly is causing this issue! 189,000 miles and have been wrenching on it almost all those miles so I know the ins and out of this motor pretty well, hopefully someone is familiar and can help!
First, the best way to describe the sound coming from the intake is like a big rig taking off from a stop. Moving a lot of air and in low gear. It gets louder when you push the pedal down (in drive down the road or parked). When driving it will make that heavy sucking of air howling sound and then if I really put the pedal down and hold it, it will make a constant squeal sound. And other times I will press the pedal down and release fast and it will do a short squeal. Other times while this is occurring it will do a slight squeal when it shifts gears. Same goes for in park. It sounds like I am stuck in granny gear. I watch the shifts on the trans and its shifting 1-5 fluid also...When this happens there is no smoke visible at the tailpipe.
After this happened I took the turbo apart and cleaned it (Original 2003 Stock Garret Turbo). Looked pretty good for 189K. Cleaned it according to procedure and everything was very fluid and zero play in and out on the impeller just the usual slight play laterally that gets taken up with oil when running. Veins functioning very smoothly. Cleaned CAC boots, Air Intake Filter, MAF sensor. Reinstalled and sprayed boots just to double check for leaks = nothing. All piping attached well. Took it for a ride (cool - night time) and got on it hard on the interstate, no problems thought it was fixed.
Next Day I went into town and turn the AC on (morning - warm). About 30 min into the trip stopped at a light, when I continued the whoosh/howl and intermittent squeal returned. Continued for some time and then after some traveling it just stopped and was fine. Then right before I got back home it happened again. When inside let it cool down for a couple hours, returned, started, and same problem was there....
After close inspection I don't see any soot near any parts of the Y pipe or flex areas. The only soot I see it on the block near the exhaust manifolds (needs new gaskets). Even tried messing around with the AC to see if it is the compressor causing drag, its is turning on and off correctly. Its seems to happen with AC on or off but IT is the only thing that I haven't used much prior to this problem, could be coincidence. Only other thing on the truck of issue right now is a power steering pump makes a noise on hard turn. Probably irrelevant but you never know with these things!
What I really don't understand is if it was the Turbo or Y pipe wouldn't you think it would be an all the time occurrence. Because when it goes away it runs great. I did notice my max PSI was about 25 though. I can't really compare to what I usually has been because I usually monitor other things more closely.
Any help,suggestions, ideas would be much appreciated! Thanks
~1973 F250 Highboy
~2003 F350 Super Duty XLT FX4 6.0 Powerstroke
4.56 Yukon Gears,Detroit Locker,37x13.5x17 Interco Super Swamper M16,8in Custom Lift,Bilstein 5125 Custom Valved Shocks (Triple Front/Dual Rear),Fabtech Dual Rear Shock Kit/Traction Bars,ARP Head Studs, Sinister Headers/Y Pipe/Regulated Return,175 cc Injectors,Edge Juice Platinum with Attitude,SCT Tunes,Snow Performance Stage 3 Water Methanol Injection,FASS 150/180,Banks Techni-cooler System,Fluidampr,4in Straight Pipes.
Last edited by F350Powerstroker; 06-28-2014 at 05:04 PM.