Q: Remanufactured engine running lean

asked by on

I recently installed a remanded engine in my 2001 crown victoria. It has stock PI intake, accell coils, throttle body spacer and cold air intake, magna flow converters (rear cats deleted) and flow master mufflers. When I drive the car no problem at all. But siting and ideling I get a bank 1 bank 2 too lean codes. And u can smell gas in the exhaust. I couldn't find any vacuum leaks at all. Not sure what all could be the issue at this point. The CEL light comes on during this. But after overnight it's usually off and comes back on when I've been ideling for some time.

My car has 10000 miles.
My car has an automatic transmission.

Since you are using a cold air intake and most likely an air filter that is oil sprayed on it. These air filters are known to pass some of the oil that is put on it and will contaminate the mass air flow sensor causing the lean condition. The reason is the mass air flow sensor cannot measure all the air going into the engine. You can try to clean the mass air flow sensor and the intake throttle body of any excess oil. Make sure to clear all codes and the computer should be reset to start fuel control from new.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Remanufactured engine running lean

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: VW Bora V5 2001 automatic dosnt shift gear from 3rd (manually shifted) until i hit the rpm over 6000 plus

This is common when the vehicle is low on transmission fluid or has a faulty transmission control solenoid. Automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission...

Q: Ignition clicks but won't turn on

Hi there. If the engine was starting to vibrate and will no longer start then you can have a number of issues occurring. It can be anything from a failing sensor to a timing chain problem, which is common on...

Q: I have been having trouble starting my car.

This may be a sign of a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.