Having connection problems with the BAFX adapter. I emailed their trouble line to get help.

 

First make sure bluetooth has not been turned off in your phone. Unpair OBDII in your phone settings/bluetooth and then click on OBDII in available devices to pair again. Is it successful? If it pairs again, then communication between the device and your phone is OK. Also, sometimes rebooting a phone can solve problems.

If you are trying to connect with various modules in the software other than Powertrain and are getting a connection message, remember what I said about them not being filtered by year and vehicle. Most of them won't work with the Blazers.

It would be helpful if you would describe your connection problem.

p.s. I've had mine for a year and it has worked flawlessly with two different Androids and three different softwares (originally used it with Torque Pro and also connected with Scan XL Pro and a Windows Laptop for the heck of it).

If you want to check if the Car Gauge Pro app or the app settings is the problem, you can download Torque free version and see if it connects to your vehicle OK using the BAFX adapter.

If a verified to be paired BAFX device will not connect with either Car Gauge Pro or Torque Free, only then does it suggest that you may have a problem with the device itself.

 

Maybe it just needed a reboot. It is OK now.


MAF = .886 lb/min or 6.7 gm/sec at 700 rpm
MAF = 2.06 lb/min or 15.6 gm/sec at 2000 rpm


CMP* = 0.0


Short Term Fuel Trim
Bank 1 = 0-3.1
Bank 2 = -0.8-1.6
O2 Bank 1 Sensor 1 = 0-2.3
O2 Bank 1 Sensor 2 = 99.2
O2 Bank 2 Sensor 1 = 0-0.8
These Short Term Trim numbers jump around a lot.


Misfire check. Something screwy here.
I grounded #1 plug wire (left front according to my book). The misfire is identified as #2.
I grounded #2 plug wire (right front according to my book). The misfire is identified as #1.
Another screwy result: While doing this, the previous misfires at #3 &#4 were less frequent than before this test.


I need to leave on a mercy taxi service for the evening. Will check back late tonight. Thanks again for your patience. It means a lot.

 

Are you doing this at the distributor or at the spark plug?
#1 is drivers side front.
#2 is passenger side front.
terminals cross within the distributor cap - might want to check to make sure is wired exactly this way.


Fuel trims are well within normal ranges. Yes they jump around a lot. Are they negative or positive can't really tell by your description. For example, a reading of +3.0 would mean the system is adding 3.0% additional fuel to the factory calibration in order to get the correct O2 sensor reading (computer thinks engine was running lean 3.0% and needed more fuel). a negative fuel trim means that computer thinks engine was running too rich and needed to lean things out a bit. -10% to +10% is considered normal. Outside that is definitely indicating a problem.

Your O2 sensor readings don't seem to be voltages.

I'll check on mine and let you know what the values are or if there is something screwey with Car Gauge Pro.

 

Found the misfire counter problem is definitely a bug in Car Gauge Pro. I could duplicate your results. In Torque Pro no problem with the misfire counters. I'll contact the developer again and see if he will fix it.

I'm convinced your misfire detection system is working fine.

 

This link is garbage

 

Fuel Trim and O2 sensor readings on my Blazer at idle in drive and at 2100 RPM in park. How do these compare to yours? Note the min and max value for each.

 

cancel this

 

Double checked distributor to plug wiring. It is correct.
When checking for misfire, Igrounded at the wire end, not at the distributor. I stuck a 1/4 bolt in wire and grounded it with a patch cord.

I didn't take the time (I amnot sure I could yet) to duplicate your fancy gauge pictures. Here are my numbers compared with yours.

[email protected]
STFT B1+1.2 (-.04 +4.3)
STFT B2 +0.4 (-2.7 +4.3)
HO2S B1S1 +0.15(+.05 +.81)
HO2S B1S2 +0.78(+.77 +.78)
HOSS B2S1 +0.19(+.09 +.82)
MAF +5.44 (+5.39+12.64)

[email protected]
STFT B1+1.2 (+.4 +2.7)
STFT B2 -2 (-3.5 +1.2)
HO2S B1S1 +.84 (+.83 +.86)
HO2S B1S2 +.84 (+.83 +.86)
HOSS B2S1 +.42 (+.05 +.85)
MAF +6.3 (+6.26 +6.46)



[email protected]
STFT B1-2 (-10.6 +7.5)
STFT B2 -5.9 (-12.2 +6.7)
HO2S B1S1 +0.65 (+.03 +.9)
HO2S B1S2 +0.75 (+.75 +.92)
HOSS B2S1 +0.24 (+.06 +.88)
MAF +16.42 (+4.95 +124.03)

[email protected]
STFT B1+3 (-2.7 +4.3)
STFT B2 +2.7 (-2 +5.1)
HO2S B1S1 +.71 (+.07 +.84)
HO2S B1S2 +.45 (+.44 +.46)
HOSS B2S1 +.47 (+.11 +.85)
MAF +14.75 (+13.67 +14.75)

 

Joe, please advise if the O2 sensor voltages in red below are swinging up and down across 0.45 volts during extended idle in drive or are they stuck above or below a certain voltage for an extended period of time.

j[email protected]
STFT B1+1.2 (+.4 +2.7)
STFT B2 -2 (-3.5 +1.2)
HO2S B1S1 +.84 (+.83 +.86)
HO2S B1S2 +.84 (+.83 +.86)
HOSS B2S1 +.42 (+.05 +.85)
MAF +6.3 (+6.26 +6.46)

Maybe try each O2 sensor in graph mode. Here is mine swinging from <0.12 to >0.75 - time lapse for graph is 10 seconds and resolution is 20 points/sec (with the BAFX). My Blazer seems to do about 3-3.5 complete cycles up/down past 0.45 volts over 10 seconds. Both O2 sensors seems to swing about the same voltage amount back and forth. got to be careful about instantaneous readings with some of this stuff that cycles, like fuel trims and O2 sensor voltages.

p.s. I figured out during lunch that the misfire counter bug we identified is that only cyl 1 and 2 are switched. I tried all the rest and they are correct. So I'm convinced that yours is truly an intermittent misfire on 3 and 4 if that is what is reading and you can feel a miss happening. What is the misfire counter maximum during a misfire time period. That will tell us how bad it is. Bet you have noticed that the counter starts over periodically.