95cherjustin
NAXJA Forum User
- Location
- doylestown, pa
Without a scan guage hooked up on my 95 jeep cherokee is there a way to monitor open and closed loop? 95 xj 4.0 obd1
Highly, Highly Unlikely. Remember the manufacturer wants the engine to get as much fuel mileage as possible also. OEM setup the ECU to go into Open Loop only when necessary, either because the O2 sensor is unreliable or the engine needs a richer than 14.7:1 A/F ratio. Remember, the narrow band O2 sensor can only tell the ECU when its "passing" through the 14.7:1, it can tell it anything else reliably about the A/F ratio.So here's a question - would there be a fuel economy advantage to tricking the computer into going into closed loop mode earlier than normal? Possibly by faking the voltage it gets from the ECU temp sender when actually warm. What would be the disadvantages to that? Higher levels of pollutants?
Do some research, you might have OBDII or a hybrid of OBD1 & II. 1996 M/Y is only the date the government mandated that all manufacturers had to switch to OBDII. The standard had been out for years, and the manufacturers began implementing it before 1996 M/Y. Chrysler, which was using its EFI system in Jeep by 1995 had started to use OBDII features in their ECU's before 1996.I have OBD1 since i am a 95 xj, do you know of a obd1 site for a cable to connect to a labtop ortuning device
Highly, Highly Unlikely. Remember the manufacturer wants the engine to get as much fuel mileage as possible also. OEM setup the ECU to go into Open Loop only when necessary, either because the O2 sensor is unreliable or the engine needs a richer than 14.7:1 A/F ratio. Remember, the narrow band O2 sensor can only tell the ECU when its "passing" through the 14.7:1, it can tell it anything else reliably about the A/F ratio.
If you trick the ECU into going into Closed Loop early, e.g. warm up, the A/F ratio would be leaner than needed and you'll likely suffer poor drive-ability and stalling out. At WOT, you'll get less power, detonation and probably damage the engine. When the O2 sensor is NOT fully warmed up, you'll probably get erroneous readings and really screwed up A/F ratios, resulting in poor mileage, poor drive-ability, stalling or engine damage, if NOT all four. NOT to mention, since the ECU is always "LEARNING", i.e. storing correction factors from the feedback from the O2 sensor, you'd likely suffer poor performance and mileage in the regular Closed Loop Mode due to bad data being stored while you tricked the ECU into closed loop mode when it should have been in open loop.