What would cause a "lean" condition??????
Thread Starter
Instructor
Joined: Apr 2003
Posts: 211
Likes: 3
From: Sarasota FL
What would cause a "lean" condition??????
Hi everyone.
Well, the car ('99 w/75k) has been idling a little on the rough side recently so I purchased a set of wires and plugs, but having checked the cars codes, it seems as if teh car is running "lean."
I'm getting codes:
P0171 Fuel Trim System Lean bank 1-B
P0174 Fuel Trim System Lean bank 2-B
Now, if I'm not mistaken a lean coindition could be caused by a vacuum leak or by a lack of fuel being delivered into the motor.
Is there a place/procedure/diagram that i can use to troubleshoot a vacuum leak?
Is there a place/procedure/diagram that i can use to test the fuel presssure as it's delivered to the engine? Fuel pump failure, fuel filter clogged, etc.
Is there anything obvious I'm missing?
I'm pretty desperate, the old girl nearly concked out on me on the way home from work.
Thankyou for your help.
Andy.
Well, the car ('99 w/75k) has been idling a little on the rough side recently so I purchased a set of wires and plugs, but having checked the cars codes, it seems as if teh car is running "lean."
I'm getting codes:
P0171 Fuel Trim System Lean bank 1-B
P0174 Fuel Trim System Lean bank 2-B
Now, if I'm not mistaken a lean coindition could be caused by a vacuum leak or by a lack of fuel being delivered into the motor.
Is there a place/procedure/diagram that i can use to troubleshoot a vacuum leak?
Is there a place/procedure/diagram that i can use to test the fuel presssure as it's delivered to the engine? Fuel pump failure, fuel filter clogged, etc.
Is there anything obvious I'm missing?
I'm pretty desperate, the old girl nearly concked out on me on the way home from work.
Thankyou for your help.
Andy.
Le Mans Master
Joined: Aug 2000
Posts: 8,762
Likes: 2
From: Murphy TX
I'm with them, check fuel filter. Check intake track and make sure nothing's come loose (unmetered air) but likely the filter.
I'll tell you what, a few hundred for autotap is sometimes worth it. You can see alot of detail on what's going on, and it's fun to boot (I'm a bit of a geek though
).
You'll get it figured out fast!
I'll tell you what, a few hundred for autotap is sometimes worth it. You can see alot of detail on what's going on, and it's fun to boot (I'm a bit of a geek though
).You'll get it figured out fast!
Instructor
Joined: May 2005
Posts: 124
Likes: 0
From: Baton Rouge LA
Where is the fuel filter on a '00 vette?
B & B Tri-Flow Exhaust and Headers, RM Twin-Flo Air Intake System, z06 Air Flow Duct and SS Coupler, Throttle Body Bypass Kit, 172 Thermostat, MAT Sensor, Cold Air Screens, GM 1030 CFM Throttle Body, Max Flow Mass Air Sensor, Hypertech Programmer, Pro Torque Convertor, 3.42 Differential Assembly, z06 Intake Manifold, Hotchkis Swaybar, Bilstein Shocks, z06 Calipers, Hawk Brake Pads, Bosch Spark Plugs, Magnecor Wires, Random Technologies X-Pipe and Catalytic Convertors
B & B Tri-Flow Exhaust and Headers, RM Twin-Flo Air Intake System, z06 Air Flow Duct and SS Coupler, Throttle Body Bypass Kit, 172 Thermostat, MAT Sensor, Cold Air Screens, GM 1030 CFM Throttle Body, Max Flow Mass Air Sensor, Hypertech Programmer, Pro Torque Convertor, 3.42 Differential Assembly, z06 Intake Manifold, Hotchkis Swaybar, Bilstein Shocks, z06 Calipers, Hawk Brake Pads, Bosch Spark Plugs, Magnecor Wires, Random Technologies X-Pipe and Catalytic Convertors
Thread Starter
Instructor
Joined: Apr 2003
Posts: 211
Likes: 3
From: Sarasota FL
Thanks for the replies.
I'll change the filter. What are your thoughts on factory vs. aftermarket? Is the factory unit going to be any different to the filter I can pick up at the local parts store? If so, I'll get one from one of the forum sponsors.
Also, where can I learn more about autotap? Is that a system that I could use to read/tune the engine? I have a 160 Themostat that i'm waiting toinstall but don't have anything to turn the fans on earlier (I'm in FL so this should be a welcome mod). Will Autotap enable me to do this?
Thanks again.
Andy.
I'll change the filter. What are your thoughts on factory vs. aftermarket? Is the factory unit going to be any different to the filter I can pick up at the local parts store? If so, I'll get one from one of the forum sponsors.
Also, where can I learn more about autotap? Is that a system that I could use to read/tune the engine? I have a 160 Themostat that i'm waiting toinstall but don't have anything to turn the fans on earlier (I'm in FL so this should be a welcome mod). Will Autotap enable me to do this?
Thanks again.
Andy.
Pro
Joined: Apr 2002
Posts: 726
Likes: 2
From: Denver CO
If you want to tune, you need HP Tuner (and a lot of reading time ). AutoTap just scans what's going on.... HP Tuner lets you scan and tune. It'll run you $509 
, but will give you control of your car. If you know someone with AutoTap or HPT, they can log for you and then you can look at the data.
, but will give you control of your car. If you know someone with AutoTap or HPT, they can log for you and then you can look at the data.
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Burning Brakes
Joined: Nov 2004
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Likes: 0
From: Albuquerque NM
I had the same codes come up twice (with the "Check Engine" yellow light) on by 2002 coupe (13,000 miles) during a trip to San Francisco in city stop & go driving. I currently live in ABQ, NM (5000' altitude). I reset the computer and the codes have not come back - should I be concerned and have it checked out?
