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

3,300

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 out of 1 people think this is helpful.
3,300

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

8,265

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 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

Crown Victoria

Looking for a Used Crown Victoria in your area?

CarGurus has 948 nationwide Crown Victoria listings starting at $2,990.

ZIP:

Search Ford Crown Victoria Questions

Ford Crown Victoria Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 1,710
#2 Tom Demyan
Tom Demyan
Reputation 900
#3 tennisshoes
tennisshoes
Reputation 630
View All

Related Models For Sale

Used Mercury Grand Marquis
27 Great Deals out of 1,801 listings starting at $500
Used Lincoln Town Car
25 Great Deals out of 1,805 listings starting at $1,695
Used Chevrolet Impala
543 Great Deals out of 28,509 listings starting at $700
Used Ford Mustang
331 Great Deals out of 45,576 listings starting at $2,000
Used Ford Taurus
197 Great Deals out of 19,234 listings starting at $500
Used Ford F-150
2,397 Great Deals out of 210,250 listings starting at $895
Used Ford Explorer
744 Great Deals out of 74,481 listings starting at $750
Used Chevrolet Tahoe
611 Great Deals out of 27,555 listings starting at $600
Used Honda Accord
677 Great Deals out of 82,246 listings starting at $500
Used Chevrolet Camaro
136 Great Deals out of 35,100 listings starting at $1,995

Used Cars For Sale

2011 Ford Crown Victoria For Sale
5 Great Deals out of 122 listings starting at $5,450
2008 Ford Crown Victoria For Sale
3 Great Deals out of 112 listings starting at $2,990
2007 Ford Crown Victoria For Sale
74 listings starting at $3,995