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troubleshooting open loop all the time

T

teddie1960

New CEG'er
Joined
Mar 13, 2007
Messages
10
How would I go about troubleshooting a 1995 ford contour 2.0 eng that stays in open loop all the time. The ECT has been changed with still the same results. Any suggestions or a troubleshooting tree would greatly be appreciated
 
open loop

open loop

by using a scanner on it all the time to tell what is going on with systems while running
 
open loop

open loop

DCL DATA

BOO/OFF
CANST PURGE ON
ECT 0.7
ECT ('F) 184
ENG 800
EVR % 0
FUEL PW1 (MS) 3.1
FUEL PW2 (MS) 0.0
IAC % 37
IAT (V) 2.4
IAT ('F) 97
LOOP OPEN
LT FTRM 1 (%) 0
LT FTRM 2 (%) 0
MAF (V) .7
02 SENSOR (V) 0.05
SPARK 25
ST FTRM 1 (%) 0
ST FTRM 2 (%) 0
TOT (V) 1.3
TOT ('F) 150
TP MODE C/T
TPS (V) 0.9
VPWR 13.8
VREF 5.0
VSS 0
WOT A/C OFF

Car can sit at idle for 30 minutes with temp rising an never go to close loop, while driving stays open loop, however I did receive a 172 for lean bank #1 after I returned home from driving the car. I checked for leaks by using carb cleaner couldn't find anything yet but will keep looking, any ideas appreciated
 
teddie1960 said:
...I did receive a 172 for lean bank #1 after I returned home from driving the car. I checked for leaks by using carb cleaner couldn't find anything yet but will keep looking, any ideas appreciated
Click to expand...

1995 OBDI
172 (R,M) Oxygen sensor not switching - system is or was lean - Single, Right or Rear HO2S

From TSB for lean condition, (for OBDII systems).

System Too Lean The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The code is set when the adaptive fuel tables reach a rich calibrated limit.

Fuel System:
· Contaminated fuel injectors
· Low fuel pressure or running out of fuel (fuel pump, filter, fuel supply line restrictions)
· Vapor recovery system (VMV)

Induction System:
· MAF contamination
· Air leaks between the MAF and throttle body
· Vacuum leaks
· PCV system concern
· Improperly seated engine oil dipstick

EGR System:
· Leaking gasket
· Stuck EGR valve
· Leaking diaphragm or EVR

Base Engine:
· Exhaust leaks before or near the HO2S
· Secondary air concern

Powertrain Control System:
· PCM concern
 
Last edited:
open loop

open loop

Thanks Tony, I will check this out tomorrow and see what I can come up with, Thanks again
 
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