Question about 1994 Pontiac Bonneville

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I changed the left front wheel bearing on my 2000 Bonneville. Took it for test drive and the oil pressure dropped to zero. I ran it until I heard the lifters. What did I do? Could I have damaged the oil pump or lines when I Jacked the car up?? I'm Baffled

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  • Pontiac Master
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First thing you need to do is get under there and see where it's leaking from. (can't fix it if you don't know what you are fixing) When oil pressure drops to "0" you are supposed to shut it off and find out why, otherwise, it can cost you an engine. Three places I'd immediately look for damage is the oil pan, filter and pressure sending unit, all of which will cause rapid oil loss if damaged. Do not run the engine 'till fixed!!! Unless you fill oil and monitor level while checking for leak..

Posted on Apr 23, 2009

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Posted on Jan 02, 2017

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i have been fooled by this one way to many times. when a wheel bearing or hub assesembly is making noise, it will sound like it is comming from the other side. i do not know why this is. but one test will prove if and which one. when growling noise occurs, notice, when turning left or right, does noise get louder and quieter as you turn? if so then it is wheel bearing. when turning left the right side will make more noise. when turning right the left side will make more noise. if always the same then, tires or transmission need addressing. the cv axle does not make a growling noise, unless front wheel drive car does not move, it makes a clicking or poping noise. sorry but at least you dont have to replace other axle

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What you really want to do is have a technician remove the oil sending unit and attach a pressure gauge of known reliability. Only then can you know if your pressure is good or bad.

If you have to change an oil pump, you can have problems reaching it. You may be able to find a Video or text online for your exact model. The Capri series covers a lot of Years and the engines may be different and one year may be a front wheel drive while an older one may be rear wheel drive.

One of the biggest problem is having clearance to remove the oil pan. Sometimes in the closest clearances turning the crankshaft can help make room to drop the oil pan.

Front wheel drive units can have a cradle which blocks pan removal. You need to find out the requirements for your exact year.

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