P0171 - system too lean
#1
P0171 - system too lean
my check engine light came on on my 97 2.3, so i went and had it checked at advanced. So i got this code and replaced the front o2 sensor because it came up bank 1. I then got the code removed and it came back on with the same code. The only other problem i have been noticing is that when i downshift, the rpms will want to drop near 600 when i push in the clutch from 2,000 rpm. Thanks in advance.
#5
#7
that is a VERY unsafe technique!!!!! All you have to have is fuel for the fire(i.e. a frayed spark plug wire) and boom, there goes ur eyebrows and probably all of your vacuum lines, wiring harnesses and possibly paint too!!!
#9
How does it cold start and idle? Whats outside temp? Do rpms drop even at operating temps.? To check for vac. leaks first with cold eng off with good lighting do a visual insp. working from one side to the other inspecting all hoses and connections, look for cracks and loose connections, there arent very many vac. hoses on the 2.3-2.5's. A vacuum guage may help. Inspect fasteners for torque, on MAF sensor, throttlebody, and intake manifold, check intake tube-to-air filter. If initial insp. doesn't find anything, start eng.(no heat or a.c.) and listen underhood for a whistle or hissing sound, idle should be smooth-steady @900-1000RPM.(higher side in cold weather) Maybe a dirty intake sensor, or intake manifold leak? check PCV Valve (rattle test). Did the new front O2 sensor help? or the same? If you have one behind the cat.conv. it may still be bad.
Last edited by Super95; 02-29-2008 at 08:17 PM.
#11
Thread
Thread Starter
Forum
Replies
Last Post
dsrtghst42
4.0L OHV & SOHC V6 Tech
2
11-22-2011 11:39 PM
bryanjints
4.0L OHV & SOHC V6 Tech
21
12-19-2009 11:39 AM