91' F250 problem
#1
91' F250 problem
Hello everyone, I'm new to the forum and have a question or two about my diesel that I hope ya can help me with. I am the proud owner of a 1991 Ford F250 2WD with a 7.3L engine. The truck is very clean and is in great working order (is for the most part stock). From when I first bought it up till now it makes a rattle noise under the hood when I am in any gear and my tach is at about 900-1200 rpms. I suspected that this was in the exhaust system, so I looked it over but could not find any loose parts. I also went ahead and replaced the stock muffler with a flowmaster 40. I examined the engine compartment and found a few loose parts, went ahead and tightened those up. After all that it still makes the same rattle. Any ideas of what this could be and how to fix it?
#2
well i have a 91 f-250 with the 7.3 myself. unlike yours mine is not clean and not in good condition. it makes all kinds of sounds that i cant locate so no sorry i cant really help you. -but check inside the side panals. my buddie danial had his brand new truck that made a rattle and there was a pop bottle with a note in there it said "took you a while to find it dident it?"
#3
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#7
If it is RPM related it may be the dual mass fly wheel starting to go bad.
If I remember right, remove the dust cover on the bell housing.
Truck in neutral, engine off.
Free play in the flywheel is to be less than 5/8" rotation wise.
More power,
Air intake mods
Exhaust mods
Timing adjusted
Injectors rebuilt
IP recalibrated
Turn just a bit more fuel to it.
How many miles on the engine/truck?
Do you have any black smoke when you are pulling the hills or taking off or driving down the road?
A turbo is the biggest bang as far as more power goes.
I had a rattle under the front of my truck going over bumps that I could never find.
Last year I changed my front springs, when I dropped the front spring shackle down out of the frame I found my rattle. The top bushing in the front spring shackles was completely gone on both sides. But that was at 300,000 miles on the truck. I had been trying to find it for close to one hundred thousand miles though.
If I remember right, remove the dust cover on the bell housing.
Truck in neutral, engine off.
Free play in the flywheel is to be less than 5/8" rotation wise.
More power,
Air intake mods
Exhaust mods
Timing adjusted
Injectors rebuilt
IP recalibrated
Turn just a bit more fuel to it.
How many miles on the engine/truck?
Do you have any black smoke when you are pulling the hills or taking off or driving down the road?
A turbo is the biggest bang as far as more power goes.
I had a rattle under the front of my truck going over bumps that I could never find.
Last year I changed my front springs, when I dropped the front spring shackle down out of the frame I found my rattle. The top bushing in the front spring shackles was completely gone on both sides. But that was at 300,000 miles on the truck. I had been trying to find it for close to one hundred thousand miles though.
Last edited by Dave Sponaugle; 04-27-2006 at 09:29 PM.
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I don't run the truck hard at all. I am running 235x85x16LT tires all the way around. In 4th gear I am at about 2000 rpm's going 45mph. The transmission is 4spd with Overdrive and the truck is 2WD. Air filter, oil and oil filter has been changed during the last 1000 miles as well.
Last edited by Dave7.3; 05-01-2006 at 12:06 AM.