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1999 Bonneville: intake gaskets..I purchased a used engine..carfax

Resolved Question:

I had to have intake gaskets replace on my 1999 Bonneville 3.8 for a cost of $750.00. Two months later the engine failed. I purchased a used engine with 37000 miles (carfax checked). I last only a few hundred miles and the engine failed.
Submitted: 8 years ago.
Category: Car
Expert:  CarQuestionGuy replied 8 years ago.
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Customer: replied 8 years ago.
I had to have intake gaskets replace on my 1999 Bonneville 3.8 for a cost of $750.00. Two months later the engine failed. I purchased a used engine with 37000 miles (carfax checked). I last only a few hundred miles and the engine failed.

Optional Information:
1999 Pontiac Bonneville 3.8

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Expert:  CarQuestionGuy replied 8 years ago.
I need to know what you are asking. What question am I supposed to be answering?
Customer: replied 8 years ago.
Well with 2 engine failures within a month there has got to be something that caused it.

Do you have any idea or suggestion as to what may have caused this. Both engines lost oil pressure and started knocking.
Expert:  CarQuestionGuy replied 8 years ago.
In the case of your first engine there was probably coolant that got into the oil then it most likely started rusting the bearings out of it. I've seen this happen more than once and it is always a chance you take when you have an internal coolant leak.
As for the second engine even though you had a carfax check and it seemed like a good engine, you still don't know what had been done to it. For all you know the exact same thing could have happened. Intake manifolds gaskets are a common thing to go bad on these engines.
There is nothing extranally that can cause your engine to lose oil pressure and start knocking. There had to be a problem inside both engines. So unfortunately I think you just replaced your bad engine with another bad engine.

Please let me know if you have any other questions.
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