Jim Grant's Tech Tips
'86 Nissan Maxima
Q:
I
have an '86 Nissan Maxima. A couple of weeks ago I drove home from work
and the car was working fine and was quiet. I did not drive it anymore
until the next morning when I started it to go to work. Evidently the
muffler decided to die overnight because it was extremely loud driving
to work and has been since that point. I drove it for about a week and
it was running fine (except for the noise) until suddenly it started shutting
down while driving. I assumed it must be related to some sort of computer
exhaust reader being temporarily thrown off by the bad muffler and was
probably not a big deal. But then one afternoon I turned left onto a four
lane road and the car stopped in the middle of the road with cars flying
down a hill towards me! A bit of smoke was spiraling up from under the
hood on the driver's side and it wouldn't start back up immediately like
it had been. It eventually did, and believe me I drove straight home and
have been riding the bus since! How could my muffler have died so suddenly
(literally in its sleep) and is the stopping really related to the exhaust
system somehow?
-
Sarah
A:
How
do mufflers die in their sleep? You have to understand how much the exhaust
system grows and shrinks "measurably" during normal operation.
Of course the growth occurs as the vehicle is driven due to heat and when
you park the vehicle the exhaust shrinks as it cools. If there is a weak
area in the exhaust this normal cycle can cause the weak area to break
after the vehicle has been parked. As for the exhaust system problem causing
your vehicle to just stall and have restarting problems, not likely. The
computer or program just doesn't know. Get the exhaust system repaired
and then ask for an inspection under the hood of the vehicle. That smoke
that was spiraling out has a cause that may provide a solution to your
stalling problem.
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