Coolbeans007 Posted March 20, 2020 Report Share Posted March 20, 2020 Ok first things first, I am no engine tuner, I recently got my ecu with a new harness for my 4age 16v. After getting the guy who made it to tune it, life was good. After doing a few tweaks like connecting the brake booster to my vacuum manifold the idle just dropped, it went from 1200 to 500 and would stall on cold start. I disconnected it and plugged it but the problem remained. I called up the guy who made and we tweaked it a little. At the time I didnt have a wideband so we couldnt see the afr. Now I have the AEM x series gauge. Its pretty good, except, it flat out doesnt send the correct lambda signal to my ecu. The gauge is correct but the ecu reads 1.227 at idle, all the time, even when reving which sometimes stalls it. It sometimes tries to work and it will go down. For example when the car is not on, the lambda read the same on the gauge and on the ecu. The gauge's lambda is very lean on idle, it usually is in the high like 1.6. I am running on pump gas. When I rev up and it doesnt stall the lamda on the ecu is bouncing all over the place. Ive checked my connections for the analog output of the gauge and all the wires are correct. The only thing I can thing of is I made a extension to the power for the gauge and I didnt ground it to the battery. I am running itbs with cop aswell. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 20, 2020 Report Share Posted March 20, 2020 The Xseries gauges have a CAN bus output (labelled AEMNet), I would suggest you connect it to the ECU via CAN rather than mess around chasing analog ground offsets etc. There is a set up guide for the xseries CAN bus in the help file under device specific CAN. Quote Link to comment Share on other sites More sharing options...
Coolbeans007 Posted March 20, 2020 Author Report Share Posted March 20, 2020 Wait but doesnt that mean that I need CAN Lambda? Quote Link to comment Share on other sites More sharing options...
Coolbeans007 Posted March 20, 2020 Author Report Share Posted March 20, 2020 I just connected the can wires from my gauge to the analog ones to my ecu and the values for lambda are still different. Any suggestions? Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 20, 2020 Report Share Posted March 20, 2020 Attach your tune. Quote Link to comment Share on other sites More sharing options...
Coolbeans007 Posted March 20, 2020 Author Report Share Posted March 20, 2020 Here you go. Edit: I also forgot to mention there is a little white smoke coming from the exhaust. Im pretty sure it has a bad head gasket. 4ag_started_1.pclx Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 21, 2020 Report Share Posted March 21, 2020 Here is your tune set up with the analog lambda changed to AEM CAN. 4ag_AEM CAN.pclx Quote Link to comment Share on other sites More sharing options...
Coolbeans007 Posted March 21, 2020 Author Report Share Posted March 21, 2020 Nope still doesn't work, the error value is the only thing displayed on the digital gauge. The gauge might be putting out a low voltage? My output wires from the ecu connector are ANVOLT 2, should I be connected to CAN H and CAN L? Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 21, 2020 Report Share Posted March 21, 2020 I’m not sure I understand what you wrote, but the “AEMNet -“ wire from the wideband needs to be connected to CAN L at the ECU and the AEMNet+ needs to be connected to ecu CAN H. Coolbeans007 1 Quote Link to comment Share on other sites More sharing options...
Rossobianconero Posted March 22, 2020 Report Share Posted March 22, 2020 On 3/20/2020 at 12:16 AM, Coolbeans007 said: Ok first things first, I am no engine tuner, I recently got my ecu with a new harness for my 4age 16v. After getting the guy who made it to tune it, life was good. After doing a few tweaks like connecting the brake booster to my vacuum manifold the idle just dropped, it went from 1200 to 500 and would stall on cold start. I disconnected it and plugged it but the problem remained. I called up the guy who made and we tweaked it a little. At the time I didnt have a wideband so we couldnt see the afr. Now I have the AEM x series gauge. Its pretty good, except, it flat out doesnt send the correct lambda signal to my ecu. The gauge is correct but the ecu reads 1.227 at idle, all the time, even when reving which sometimes stalls it. It sometimes tries to work and it will go down. For example when the car is not on, the lambda read the same on the gauge and on the ecu. The gauge's lambda is very lean on idle, it usually is in the high like 1.6. I am running on pump gas. When I rev up and it doesnt stall the lamda on the ecu is bouncing all over the place. Ive checked my connections for the analog output of the gauge and all the wires are correct. The only thing I can thing of is I made a extension to the power for the gauge and I didnt ground it to the battery. I am running itbs with cop aswell. When you wire the an+ to the ecu, did you wire the an- (brown cable on the AEM X Series) to ground? Quote Link to comment Share on other sites More sharing options...
Coolbeans007 Posted March 22, 2020 Author Report Share Posted March 22, 2020 Nope I wired it to the other brown wire in my harness. Quote Link to comment Share on other sites More sharing options...
Rossobianconero Posted March 24, 2020 Report Share Posted March 24, 2020 On 3/22/2020 at 1:38 PM, Coolbeans007 said: Nope I wired it to the other brown wire in my harness. and that brown wire of your harness is what? If you don't have ground on that brown wire the voltages that send through the 0-5v signal its going to be off. Probably thats why your ecu is reading odd. Quote Link to comment Share on other sites More sharing options...
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