help with gf's 2000 escort

[OKCstanger]

it just threw code P0171 - system too lean bank #1. also its running slightly rough at times.

any ideas on where to start for troubleshooting? i appreciate any help you can provide!

[medic]

not sure, are their any escort board out there. Is the haynes manual any use.

how many miles?
when was the last time you did a tune up? things like checking the 02 sensor air filter, etc would be simple first steps.

[shawzam]

Well, I hope this is of some help. Found it on my Focus forum (same engine). It'll at least get you started.

P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.
For lean and rich DTCs:
Fuel system
Excessive fuel pressure.
Leaking/contaminated fuel injectors.
Leaking fuel pressure regulator.
Low fuel pressure or running out of fuel.
Vapor recovery system.
Induction system:
Air leaks after the MAF.
Vacuum Leaks.
PCV system.
Improperly seated engine oil dipstick.
EGR system:
Leaking gasket.
Stuck EGR valve.
Leaking diaphragm or EVR.
Base Engine:
Oil overfill.
Cam timing.
Cylinder compression.
Exhaust leaks before or near the HO2Ss.
A SHRTFT-1,2 PID value between -25% to +35% and a LONGFT-1,2 PID value between -35% to +35% is acceptable. Reading beyond these values indicate a failure.