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.