Car hums but won't start?

Asked by Nov 20, 2015 at 10:49 PM about the 2004 Pontiac Grand Am

Question type: Maintenance & Repair

My car was starting fine this
morning, then in the afternoon I went
to start it and it just made a humming
noise but didn't even turn over. The
humming sounded like it was coming
from the back of the car. It would
hum not just when I was turning the
key to start it, but as long as it was in
the "ON" position.

I'm not sure if this is related, but
about a week ago, I had the IAC
valve replaced because the car
would stall immediately after starting,
and it seemed to fix the problem.

I ended up paying $50 to tow my car
back to the mechanic that replaced
the IAC valve, and they called back
saying that they started it about 15
times with no problem.

I've done some searching, and a lot
of people suggest that it could be
the battery contacts or the
connection to the ground. Other
people say it could be a bad starter
or solenoid, whatever that is.

So I'm leaving the car with the
mechanic over the weekend, hoping
they can actually see the problem.

What could the hum be? Advice?

6 Answers

103,515

The hum is the electric fuel pump.

If the fuel pump is working, does that mean that the battery connections are fine and it's something else, like the starter? I don't remember if the lights and other electronics worked.

103,515

Clean the battery terminals, cables and all the connections. Make sure the cables clamp on tightly. Intermittent problems can be a real pain in the donkey. Good luck!

Did you ever get what was wrong with it? I am in the same boat right now.

I've since bought a new car because the transmission broke, but if I recall correctly the problem just stopped happening mysteriously. There's a chance the mechanic did something, but they said they didn't, so I don't know what it was.

If it's not too expensive, I would try changing the IAC valve since it seemed to help at least at first.

Your Answer

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 723 nationwide Grand Am listings starting at $1,700.

ZIP:

Pontiac Grand Am Experts

  • #1
    tenspeed
    Reputation
    8,040
  • #2
    Tom Demyan
    Reputation
    1,650
  • #3
    John Saffrahn
    Reputation
    1,640
View All

Related Models For Sale

Used Pontiac Grand Prix
4 Great Deals out of 1,805 listings starting at $2,008
Used Ford Mustang
270 Great Deals out of 37,082 listings starting at $2,150
Used Pontiac G6
27 Great Deals out of 2,876 listings starting at $699
Used Chevrolet Impala
397 Great Deals out of 25,595 listings starting at $799
Used Pontiac GTO
358 listings starting at $2,950
Used Chevrolet Malibu
480 Great Deals out of 49,315 listings starting at $2,000
Used Pontiac Bonneville
316 listings starting at $3,395
Used Chevrolet Cobalt
17 Great Deals out of 2,594 listings starting at $2,008
Used Honda Accord
424 Great Deals out of 101,059 listings starting at $1,200
Used Chevrolet Corvette
101 Great Deals out of 15,517 listings starting at $3,900
Used Chevrolet Monte Carlo
3 Great Deals out of 937 listings starting at $3,900

Used Cars For Sale

2004 Pontiac Grand Am For Sale
186 listings starting at $1,700

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.