MY GRAND NATIONAL CODE WAS 44 WHAT COULD BE THAT.>?

5

Asked by May 03, 2016 at 04:22 PM about the 1987 Buick Grand National

Question type: Maintenance & Repair

1 Answer

Oxygen sensor - lean circuit The code 44 for lean exhaust is most likely caused by one or more of the following: 1.) O2 sensor wire - Sensor pigtail may be mispositioned and contacting the exhaust manifold. 2.) Check for an intermittent ground wire between connector and sensor. 3.) Poor ECM to engine block ground. 4.) MAF Sensor - A MAF sensor that causes the ECM to sense a lower than normal airflow will cause the system to go lean. Disconnect the MAF sensor. If the lean condition is gone then replace the MAF sensor. 5.) Vacuum leaks can cause a lean condition and/or possibly a high idle. Check for cracked hoses a bad gasket or a faulty EGR or PCV Valve. 6.) fuel pressure - system will go lean, if pressure is too low. It may be necessary to monitor fuel pressure while driving the car at various road speeds and/or loads to confirm. 7.) Clogged injector or lean injector - perform an injector balance test..

Your Answer

Add photo

Related Questions

Search Buick Grand National Questions

Buick Grand National Experts

#1 Joey Warren
Joey Warren
Reputation 130
#2 spideybee
spideybee
Reputation 100
#3 kenet12
kenet12
Reputation 90
View All

Related Models For Sale

Used Buick Regal
10 Great Deals out of 382 listings starting at $9,555
Used Chevrolet Camaro
848 listings starting at $8,995
Used Ford Mustang
4 Great Deals out of 1,358 listings starting at $5,980
Used Chevrolet Monte Carlo
13 listings starting at $7,895
Used Dodge Charger
89 Great Deals out of 917 listings starting at $3,990
Used Chevrolet Corvette
658 listings starting at $4,450

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.