I have been trying to find the cause for an unpleasant sound coming off from the engine compartment... Sounds like something vibrating against something, but there is nothing loose anywhere I can possibly find.
I have been searching the cause for several hours now and all I can think of right now is the motor mounts.
The "noise" comes on around 1000rpm and it's really loud.... The truck now has almost 194 000miles on the clock, could the motor mounts be the cause?
Any ideas`?
Most sounds other than a good running diesel engine are unpleasant... can you be a little more specific. Is it a knock, a rattle, does it only happen if forward gear or reverse too. To check motor mounts I usually have the hood open and torque up the engine with the brakes on..... any abnormal lifting of the motor will be seen in forward and reverse.
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93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93
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Also check the cab to downpipe clearance, your cab mounts could be toast.
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91 F350 crew cab 4x4 7.3 ats and intercooled with cut down 2000 ps cooler, bigger turbo comp,head studs, torque cam, coated rockers , balanced. very good power.
pyro,boost and all stock guages ignored with mechanical real ones
Fugitive sandrail. type 4 2840 turbo fi, lots of fun
also--check front spring--rear shackles--the bushings wear--and the spring bounces off of frame--been there--
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94 f250 idi turbo sc e4od alum fac rims 149,289 --dana 60 frt with posi--10.25 rear w/posi--shouldnt get stuck!! ats turbo 3" parts on--what a diff from stock turbo!!!!!--- also 96 F250 with 305,000 is fixed!!-- 7.3 rattler-also 85 6.9-needs new engine!! tired!!
Most sounds other than a good running diesel engine are unpleasant... can you be a little more specific. Is it a knock, a rattle, does it only happen if forward gear or reverse too. To check motor mounts I usually have the hood open and torque up the engine with the brakes on..... any abnormal lifting of the motor will be seen in forward and reverse.
It's like a rattling sound and it happens in forward and reverse also, everytime the time rpm's are around 1000rpm.
The downpipe has clearance though.
This video demonstrates me doing a cold start at -15C without a block heater being attached....
Some erratic idle at the start of the video, then I'll be keeping the rpm's close to 1000 to demonstrate the annyoing sound I'm trying to "delete" here....
Auto trans flex plate! Remove inspection cover and check.
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Regards,
Paul - Pocono Mtns. USA
02 E350 15 Passenger, 52,000 Miles
'90 E350 7.3L Ex-Ambulance High Top 400K Miles, No Turbo, Stock Stock stock, No ELC! (Extended Life Coolant) & 10 Oz. Bars Stop Leak, Retired 11/8/2011 with blown trans.
i watched the video and noticed that it takes some time for the oil pressure to build up also when the rpm drops below 1000 your volt meter drops.the truck sure make a rough sound after it starts
Sounds like it's in the exhaust. RPM related drone almost. Like a loose pipe inside the muffler.
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1986 F350 Crew Cab 2wd SRW. 1991 7.3 IDI, T-19 4spd Sterling 10.25 3.55, 12" HD clutch. A Banks waste gated turbo. 5" cut down Peterbilt stack. Midwest rebuilt IP turned up. AC Delco 6.5 GM 12V GP's, working great. Running W85 high performance zero-gel diesel! D60 front conversion, 4wd conversion, dually conversion, and steel flatbed conversion now underway. Man those frame rivets are a pain!
1966 Porsche 911. 1983 911 SC engine with modified Zenith carbs, headers, 911S brakes, custom fuel rails, MSD 6al box with timing computer, 1974 IROC body kit. 1850lbs, 200rwhp, total blast to drive.
My truck had that sort of noise on one camping trip. I thought it was wheel bearings as it only happend when I made a right turn under heavy load (trailer attached), and upon deceleraton ( I had just replaced ball joints and repacked bearings).
When I got home I decided to investigate further and found that when I moved the tranny dipstick tube I moved the DP and it was hitting on the cab when I applied a good torque to the engine. I repositioned the DP and it has never made that noise again, including an 8500 mile trip.
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1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
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Train Horns: Pictures here
Sounds like it's in the exhaust. RPM related drone almost. Like a loose pipe inside the muffler.
agreed, I'd be having someone hold it at 1000 rpm for me and sticking my head under the cab to listen where the noise is, might see your tailpipe shaking to beat all if a hanger broke off
agreed, I'd be having someone hold it at 1000 rpm for me and sticking my head under the cab to listen where the noise is, might see your tailpipe shaking to beat all if a hanger broke off
It's not from exhaust... the exhaust system is just replaced, new piping, new muffler and everything tightly in place. And the downpipe being in a correct position.
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Motor mounts...?
The truck now has almost 194 000miles on the clock, could the motor mounts be the cause? 
Turn it up!
Linear Mode
