Always get a "checksum mismatch"
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,099
Likes: 821
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Always get a "checksum mismatch"
I'm using the aldl droid app with 1320 electronics bluetooth. My car is running like **** once it gets up to temp and I let it sit for 15 minutes or more. Wanting to see if my datalog can help, but I doubt it's giving me accurate info with the "chcksum mismatch" message. Has anyone had this problem, how did you fix it?
93 C4 LT1
93 C4 LT1
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,099
Likes: 821
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
The weird part is that the coolant temp and RPM agree with each other on the app and the gauges on my car. Maybe I have the wrong adx file?
Drifting
Joined: Jul 2009
Posts: 1,258
Likes: 99
From: Ashland PA
2021 C4 of the Year - Modified Finalist
I get a checksum intermittently on my 90 using aldldroid, it has to do that the data comes through the CCM first instead of directly from the ECM. It does not seem to effect data ecept it gives the incorrect oil temp witch has to do with the adx file. You can try posting over on the EFI gearhead forums, they have a thread covering aldldroid which I believe the developer is involved with.
http://www.gearhead-efi.com/Fuel-Inj...2318-ALDLdroid
http://www.gearhead-efi.com/Fuel-Inj...2318-ALDLdroid
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,099
Likes: 821
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Awesome read
Ok thanks, I thought something was wrong. So guys, how would I know if my o2's are bad? On this app, it gives me a temp readout for both sensors.
Ok thanks, I thought something was wrong. So guys, how would I know if my o2's are bad? On this app, it gives me a temp readout for both sensors.
Drifting
Joined: Jul 2009
Posts: 1,258
Likes: 99
From: Ashland PA
2021 C4 of the Year - Modified Finalist
On my 90 there is only one 02 sensor and I beleive it reads in millivolts, once your in closed loop the 02 should bounce around from say 30 to 800, from what I have learned so far that tells you they are working, on your 93 you may have heated 02 senors, but I would think you should have the same readings on your 02's in millivolts.
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,099
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From: Dallas Texas
2025 C4 of the Year Finalist - Modified
Did 3 datalog files today. One with a cold start. Second with engine warm and a WOT pull. 3rd when I felt the miss. How do I upload them to the forum? Or I can email them to someone if you want. Any help is appreciated
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Race Director
Joined: Oct 2011
Posts: 16,099
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From: Dallas Texas
2025 C4 of the Year Finalist - Modified
OK, my left bank is lean, 144. Right bank is slightly rich, 124. I know 128 is ideal. What should I check that is causing the left bank to go lean?
