I have a mercury grand marquis 1996 wont start but then it does on his own

Asked by Jan 26, 2015 at 01:46 PM about the 1996 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

I had been taking the car to the mechanic with the same syntoms; it cranks very well
but wount start. He replace the oxigen sensor becuase check engine light was off and
it was detected that sensor was malfunction. The car started doing the same thing but
few days later started again on his own and the sensor light stays light up again.
Before the last time this happened the car was taking to the mechanic via towing truck
as soon as we got there, the car started like nothing ever happened. I reach the
conclusion that the fact the car was moved while in towing truck, the problem is the
fuel pump. The mechanic discard the fuel pump as been the problem instead replace
the oxigen sensor. Two days ago the car started doing the same and today started like
nothing ever happened.  Dirving me crazy!   Any idea?

4 Answers

54,615

A bad o2 sensor will not stop it from starting. I would find another mechanic.

1 of 1 people found this helpful.

Bob is right. It's in open loop at start up anyway, meaning the signals from the 02 sensors are ignored.

2 of 2 people found this helpful.

I think an OBDII scan is called for here. Many parts houses will do it free, and eliminate guesswork. But before you buy anything...the parts guys will sell you electrical parts that can't be returned, bring the codes back here..they will be a P followed by four numbers. Then one of us will be happy to help you... or you can Google "Ford OBD Pxxxx" and click on www.obd-codes.com/ for causes and possible solutions (Your Mercury is a Ford)

1 of 1 people found this helpful.
54,615

Correct, don't buy parts just based on a code scan at a parts house.

1 of 1 people found this helpful.

Your Answer

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,698 nationwide Grand Marquis listings starting at $1,995.

ZIP:

Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
    Reputation
    5,830
  • #2
    kbro
    Reputation
    2,150
  • #3
    Js08016
    Reputation
    1,910
View All

Related Models For Sale

Used Lincoln Town Car
30 Great Deals out of 1,723 listings starting at $1,004
Used Ford Crown Victoria
6 Great Deals out of 903 listings starting at $1,496
Used Chevrolet Impala
563 Great Deals out of 36,766 listings starting at $990
Used Chevrolet Tahoe
857 Great Deals out of 44,892 listings starting at $1,980
Used Ford Mustang
607 Great Deals out of 39,015 listings starting at $1,500
Used Ford F-150
3,205 Great Deals out of 239,472 listings starting at $1,300
Used Chevrolet Camaro
500 Great Deals out of 33,566 listings starting at $1,450
Used Honda Accord
1,199 Great Deals out of 74,737 listings starting at $561
Used Chevrolet Caprice
155 listings starting at $7,995
Used Ford Taurus
218 Great Deals out of 15,232 listings starting at $1,850
Used Mercedes-Benz S-Class
166 Great Deals out of 8,047 listings starting at $2,000

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
25 listings starting at $5,450
2010 Mercury Grand Marquis For Sale
4 Great Deals out of 91 listings starting at $3,995
2009 Mercury Grand Marquis For Sale
4 Great Deals out of 79 listings starting at $2,995
2008 Mercury Grand Marquis For Sale
5 Great Deals out of 135 listings starting at $2,495
2007 Mercury Grand Marquis For Sale
7 Great Deals out of 143 listings starting at $1,995

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.