car still has a cold start problem, and when its warmed up it now has a lope and sounds rich, whats next?

Asked by Jan 07, 2013 at 01:24 PM about the 1999 Ford Crown Victoria 4 Dr STD Sedan

Question type: Maintenance & Repair

we changed the 02 sensor, bank one sensor two. we changed the MAF sensor. we checked for vacuum leaks. we went to O'reileys to read the codes and got four codes prior to replacing the MAF sensor. they were P0136, P0300, P1131, P1151. we are going to O'reileys again to clear and reset the computer then wait for new codes to be read. the 02 sensor helped slightly, as did the MAF sensor

3 Answers

3,680

Downstream oxygen sensors do not effect driveability in any way. The upstream (before the catalytic converters) sensors greatly influence air/fuel ratio, spark timing, etc. Theres a well known issue with Ford MAF sensors that leads to bad oxygen sensors. You already changed the MAF, so dont worry about that. Just remember to give it a shot of MAF sensor cleaner (NOT brake parts cleaner) whenever you change the oil to keep it clean. Now you have to go change the upstream oxygen sensors and that should solve the issue. Remember to not only clear the codes, but also disconnect the battery to reset your fuel trim tables in the computer. Then drive the car for a few days to confirm all issues are resolved.

1 people found this helpful.
3,680

Also, check your sparks plugs, as having a misfire can foul out plugs fairly quickly.

9,565

You have 2 upstream O2 sensors, and only doing one will confuse the computer. Also, make sure to use the correct ones. There is a calibration code for the car, and that determines which sensors you need.

2 people found this helpful.

Your Answer:

Crown Victoria

Looking for a Used Crown Victoria in your area?

CarGurus has 751 nationwide Crown Victoria listings starting at $2,995.

ZIP:

Ford Crown Victoria Experts

  • #1
    Tracy Hooks
    Reputation
    1,990
  • #2
    Tom Demyan
    Reputation
    1,210
  • #3
    Bob Beaman
    Reputation
    910
View All

Related Models For Sale

Used Mercury Grand Marquis
19 Great Deals out of 1,287 listings starting at $1,196
Used Ford Taurus
208 Great Deals out of 16,267 listings starting at $600
Used Ford Mustang
303 Great Deals out of 40,193 listings starting at $1,312
Used Ford Explorer
926 Great Deals out of 70,971 listings starting at $1,275
Used Lincoln Town Car
29 Great Deals out of 1,464 listings starting at $899
Used Chevrolet Impala
518 Great Deals out of 26,213 listings starting at $995
Used Ford F-150
2,357 Great Deals out of 199,530 listings starting at $1,300
Used Chevrolet Tahoe
674 Great Deals out of 38,545 listings starting at $995
Used Chevrolet Camaro
269 Great Deals out of 27,309 listings starting at $2,900
Used Honda Accord
728 Great Deals out of 103,269 listings starting at $999
Used Toyota Camry
863 Great Deals out of 71,819 listings starting at $1,300

Used Cars For Sale

2011 Ford Crown Victoria For Sale
107 listings starting at $4,950
2008 Ford Crown Victoria For Sale
79 listings starting at $4,500
2007 Ford Crown Victoria For Sale
57 listings starting at $4,979

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.