Skip the auto shop - Our mechanics make house calls

Q: Check engine light with a lean code on 1999 Chevy 3500

asked by on

I have a 1999 Chevy 3500. At some point, check engine light is on with a lean running code. Any idea what's caused this? I believe it's the fuel filter. It hesitates while on gas pedal too.

First thing you could do would be to change the fuel filter. I know why they run lean and there are 35 dozen reasons why a car can run lean. The main causes are: too much air, not enough fuel, or any combination of the two of those.

It can also be a bad MAF sensor; it can be a leak in head gasket; it can be a weak fuel pump; it can be weak fuel injectors; it can be air leaks on intake manifold. It can be air leaks on the fuel injection line. It can be all kinds of things.

You’ll want to pray that it is something simple like a bad fuel filter. If you do change a fuel filter, also have a fuel pump pressure replaced, because a weak fuel pump will do the same.

If you want to have this diagnosed, a certified technician from YourMechanic can come to your home or office to diagnose your Check Engine Light and make the proper repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: I think I may need new engine mounts. Would that cost a lot and are the parts good quality? Also, I d

Hello. I will be happy to help you with your concerns about the mechanical condition of your 1999 Solara. Let me first answer what is by far the easiest component of your inquiry and that relates to "will the parts...

Q: Th350 transmission leaks out of thr vent. On 1977 chevy k10

It sounds like it may have originally been over filled. Fill 4-5 quarts, then start the truck and then slowly fill up the remaining fluid. This should keep it from leaking from the vent hole.

Q: Why does car start when MAF sensor is cleaned with spray even after being disconnected

The MAF sensor may be not reading the correct altitude you are at and may see 10,000 ft when you are less than 500 feet. When you disconnect it the computer uses a set look up table stored in memory...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...