96 noise under load

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Author Message   Randy Arrowood (Arrowood) New Member Username: Arrowood Post Number: 1 Registered: 03-2003 Posted on Sunday, March 30, 2003 - 02:08 pm:    My 96 Disco has a problem and after three days of searching through the archive here I am still at a loss. Problem, under load, at about 2,000 RPM's I get a dull, almost diesel like sound out of the poor thing. It seems to cause a little bit of a bog down in the engine, though that could be in my head. It idles great. I can rev it in park up to 2,000 RPM's or so and it sounds GREAT. Get it under load and it sounds like the engine is about to explode. Through searching, it most closely sounds like problems people have had with cracked exhaust manifolds, but I am just not certain. I can't get out there and check just yet due to recent jaw surgery, but it is getting old not being able to drive the pig because I don't want to can the engine. Any help anyone?   Jason T. Barker (Speedminded) Member Username: Speedminded Post Number: 166 Registered: 10-2002 Posted on Sunday, March 30, 2003 - 03:26 pm:    Sounds like to me that the catalytic converters may be the problem or the engine is starving for air...I would check the air filter and box and work from there.   Jesse Lessard (Jlessard) Member Username: Jlessard Post Number: 41 Registered: 10-2002 Posted on Sunday, March 30, 2003 - 04:01 pm:    My 96 disco started making a ruff metal vibration/grinding noise just last week. It turned out that my rotoflex is falling apart and the metal from the bolts that hold it together are hitting when the engine is under load. Just a thought...   Randy Arrowood (Arrowood) New Member Username: Arrowood Post Number: 2 Registered: 03-2003 Posted on Sunday, March 30, 2003 - 04:11 pm:    It is the engine having some sort of trouble. I am going to check the air filter and box and go from there. If these ideas don't work hopefully someone will come up with something else.   Danno (Danno) Member Username: Danno Post Number: 198 Registered: 08-2002 Posted on Wednesday, April 02, 2003 - 09:22 am:    check to see if the bolts and gasket between the manifold and down-pipes are intact. had a noise that only showed up under load. both my gaskets in-between the 2 were gone, 1 bolt missing and all were loose.   Tim Ballard (Tballard) New Member Username: Tballard Post Number: 20 Registered: 03-2002 Posted on Thursday, April 03, 2003 - 09:34 pm:    I just had a very similar problem on my '96. Exhaust manifold bolt missing and bad gaskets. Runs MUCH quieter now that they are replaced.