We have a 99 Pontiac Grand Am with 99K miles and it has been using coolant
for about a month now.
Adding coolant only seems to have prolonged the inevitable.
Now it used 1/2 gallon for the last 30 miles and the service engine light
has come on.
The car also is running poorly. It is missing badly.
I want to take it to AutoZone to get a diagnostics. Is it safe to drive?
Any idea why it is now missing?
The oil is clean and exhaust appears OK.
It's a 3.4. The coolant appears to be exiting outside of the engine.
Researching the 3.4 and intake gasket problems suggests that coolant
entering into into a cylinder from a faulty gasket is nearly impossible. Oil
and exhaust appear clean.
Guessing and groping for answers never matches testing and diagnosing.
Where do you suppose that new engine misfire is coming from?
Maybe looking at a plug would help.
The sad news is that in prolonged cases like this where a person
insists on topping off and driving a vehicle with a coolant leak, the
damage often becomes progressive and the repair more complicated. Then
a partial repair is soon followed by subsequent repairs because of a
partial guess diagnosis to begin with.
You failed to read the posts by people who had the cams freeze and break and
those that had to have the engine replaced. Since you are apparently not a
mechanic take it in and have it fixed. This usually is not a DIY project
unless you have good mechanical skills. If you keep driving it make sure you
carry a cell phone and the number of a towing service....
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