Infiniti: need info on Q45

I’m considering purchasing a 1992 Q45. My husband and I test drove it
this past weekend and it runs great. There were just a couple of
noises that concerned me and I’m looking for input. The fuel pump had
a pretty significant hum that I could only hear from inside the car --
especially from the back seat. We asked the current owner about it &
he implied that it had always sounded like that. (He’s the second
owner and he purchased it from someone he knew.) The car is in great
shape and he claims to have taken really good care of it mechanically.
However, I’m having a little trouble believing that it is normal for
the fuel pump to be that loud on a luxury car even if it is 14 years
old. Has anyone experienced that?
Also, there was a sort of "knock" when turning. It was just a
single knock. Had I not looked in the glove compartment, I would have
just thought it was something rolling around in there. Any thoughts
on what that might be?
I’m attracted to the styling of the car and I was really pleased with
the ride. But I’ve never owned an Infinity and I’m having trouble
finding much information on a 1992 model. Any input would be
appreciated.

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I have had a 92 Q45 sinceit was new but i only have 92,000 miles on it.
I have never heard the whine that you write of, nor have I heard the
sound of something rolling around.

My major issues have been (and are reported by other owners) three:

1. The transmission went at 80,000. This appears to be because of the
fact that the "cooler" is in the radiator, as it was designed to heat up
the transmission fluid for the east coast contingent. For those of us
who live in California, it is transmission death. I installed a separate
transmission cooler after the replacement.

2. Potential for cracked valve timing chain guides. Until 1993, these
were made of plastic and crack at about 10-12 years or 125,000 miles. If
they crack and pieces fall off, they go directly into the oil pump
vances, which they destroy. The first thing I would do is to have them
replaced with the metal ones. The job will cost a bit ovr $2000. Mine
were replaced at 82,000 (11 years). One was cracked but had not flaked
off yet. No problems. I had the water pump replaced at the same time.

3. In California and Arizona, in particular, the injectors tend to have
a short life because of additives in the gas. I have had all of mine
replaced after the second one failed.

I love my Q; I could probably spend $50-60,000 to replace it but why?

KK


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