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Weird, Pungent Smell in rear of car after driving...any thoughts? 700 1990

Though this would be unrelated to pulsating acceleration, the smell you describe could be differential fluid. Gear oil has a very distinctive, strong smell. I'm really at a loss to describe it, it's almost a sulphur smell, but go to your nearest auto parts store & take a whiff of a bottle of gear oil & you'll understand. (Alternatively put a piece of cardboard under the differential overnight & look for drips in the morning.) If that's the smell you noticed, have it attended to as soon as possible, the consequence of leaking differential fluid is eventually a seized differential. A few tablespoons lost as small drips won't cause problems but you can't be sure when it started leaking, right?
-Chris






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