Aem wideband readings
09-14-08, 01:41 PM
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Aem wideband readings
Alright I want to first let you know I have been searching around for some answers but not really found anything to fit my problem. I am starting to tune my n/a off of the Aem wideband gauge that I installed and during fuel corrections through an SAFC II. I have reground the ecu and added 4 grounds in addition to factory ones. The problem that I am getting is my A/F ration is sitting around 15-16 on low throttle and then once I give it more throttle it goes to around 12 and then climbs sometimes to 15-16 again. This is all around 3000-4000 rpms and sometimes before 3000 rpms. I know the secondaries kick in but im near a stock map and getting a somewhat lean mixture? The wideband gauge itself has been regrounded 3 times now. I just figure somethings wrong since these things run rich on the stock map.
09-14-08, 01:54 PM
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I'm not good at explaining this but here goes. If the engine is under low load the afr might read like 15 afr or so, but then if you apply more pedal the load goes up and the mixture gets richer afm vane moves aft more). Something like that.
Try this. Connect the narrow band up to the ECU if it isn't connected now. Then with a fully hot engine, go for a ride at a steady hwy speed like 60mph. Then look and see if the afr reads around 14.7 give or take. Do it on a fairly level road. No steep up hill and no steep downhill. That's to just get an idea if the wideband is reading somewhat normal or not.
And I know you already know that when adjusting the afr using the SAFC that the narrow band sensor should be disconnected from the ECU.
And I know you know from reading the NZCONVERTIBLE training manuals, that when you let off the throttle completly the injectors shut off til the rpms get down to around 1300 rpm give or take, but more important, the front primary will shut down if you just let off the throttle a touch. THIS I can see on my wideband daily. You might be reading 14 something afr, then just barely let off the pedal and the afr will drop a full point. Now WHY it goes richer a point or so is beyond my understanding,. I'd of thought it should go leaner, not richer if the front primary drops out. Wrong.
Ther'es better answers out there and someone will answer you soon.
*********once I give it more throttle it goes to around 12 and then climbs sometimes to 15-16 again********
I understood that to mean you gave it more throttle but did not floor it. You gave it more throttle as in pressed the pedal another quarter inch and held it at that further quarter inch pedal. Not floored the pedal and the afr went to 12 or so and then as the pedal was to the floor it went back around 15-16. IF that were the case..........I'd worry a bit.
Try this. Connect the narrow band up to the ECU if it isn't connected now. Then with a fully hot engine, go for a ride at a steady hwy speed like 60mph. Then look and see if the afr reads around 14.7 give or take. Do it on a fairly level road. No steep up hill and no steep downhill. That's to just get an idea if the wideband is reading somewhat normal or not.
And I know you already know that when adjusting the afr using the SAFC that the narrow band sensor should be disconnected from the ECU.
And I know you know from reading the NZCONVERTIBLE training manuals, that when you let off the throttle completly the injectors shut off til the rpms get down to around 1300 rpm give or take, but more important, the front primary will shut down if you just let off the throttle a touch. THIS I can see on my wideband daily. You might be reading 14 something afr, then just barely let off the pedal and the afr will drop a full point. Now WHY it goes richer a point or so is beyond my understanding,. I'd of thought it should go leaner, not richer if the front primary drops out. Wrong.
Ther'es better answers out there and someone will answer you soon.
*********once I give it more throttle it goes to around 12 and then climbs sometimes to 15-16 again********
I understood that to mean you gave it more throttle but did not floor it. You gave it more throttle as in pressed the pedal another quarter inch and held it at that further quarter inch pedal. Not floored the pedal and the afr went to 12 or so and then as the pedal was to the floor it went back around 15-16. IF that were the case..........I'd worry a bit.
Last edited by HAILERS; 09-14-08 at 01:58 PM.
09-14-08, 05:48 PM
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I'm not good at explaining this but here goes. If the engine is under low load the afr might read like 15 afr or so, but then if you apply more pedal the load goes up and the mixture gets richer afm vane moves aft more). Something like that.
Try this. Connect the narrow band up to the ECU if it isn't connected now. Then with a fully hot engine, go for a ride at a steady hwy speed like 60mph. Then look and see if the afr reads around 14.7 give or take. Do it on a fairly level road. No steep up hill and no steep downhill. That's to just get an idea if the wideband is reading somewhat normal or not.
And I know you already know that when adjusting the afr using the SAFC that the narrow band sensor should be disconnected from the ECU.
And I know you know from reading the NZCONVERTIBLE training manuals, that when you let off the throttle completly the injectors shut off til the rpms get down to around 1300 rpm give or take, but more important, the front primary will shut down if you just let off the throttle a touch. THIS I can see on my wideband daily. You might be reading 14 something afr, then just barely let off the pedal and the afr will drop a full point. Now WHY it goes richer a point or so is beyond my understanding,. I'd of thought it should go leaner, not richer if the front primary drops out. Wrong.
Ther'es better answers out there and someone will answer you soon.
*********once I give it more throttle it goes to around 12 and then climbs sometimes to 15-16 again********
I understood that to mean you gave it more throttle but did not floor it. You gave it more throttle as in pressed the pedal another quarter inch and held it at that further quarter inch pedal. Not floored the pedal and the afr went to 12 or so and then as the pedal was to the floor it went back around 15-16. IF that were the case..........I'd worry a bit.
Try this. Connect the narrow band up to the ECU if it isn't connected now. Then with a fully hot engine, go for a ride at a steady hwy speed like 60mph. Then look and see if the afr reads around 14.7 give or take. Do it on a fairly level road. No steep up hill and no steep downhill. That's to just get an idea if the wideband is reading somewhat normal or not.
And I know you already know that when adjusting the afr using the SAFC that the narrow band sensor should be disconnected from the ECU.
And I know you know from reading the NZCONVERTIBLE training manuals, that when you let off the throttle completly the injectors shut off til the rpms get down to around 1300 rpm give or take, but more important, the front primary will shut down if you just let off the throttle a touch. THIS I can see on my wideband daily. You might be reading 14 something afr, then just barely let off the pedal and the afr will drop a full point. Now WHY it goes richer a point or so is beyond my understanding,. I'd of thought it should go leaner, not richer if the front primary drops out. Wrong.
Ther'es better answers out there and someone will answer you soon.
*********once I give it more throttle it goes to around 12 and then climbs sometimes to 15-16 again********
I understood that to mean you gave it more throttle but did not floor it. You gave it more throttle as in pressed the pedal another quarter inch and held it at that further quarter inch pedal. Not floored the pedal and the afr went to 12 or so and then as the pedal was to the floor it went back around 15-16. IF that were the case..........I'd worry a bit.
Ya I found a post on grounding the gauge to the block and ran a ground wire to the block from the gauge. I had no change and as far as I know the o2 sensor is ground by the manifold.
09-25-08, 11:37 PM
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http://forum.aempower.com/forum/inde...c,22331.0.html
I ended up trying what the guy recommended in the thread above. I covered the wide band sensor with a rage covered in brake cleaner trying to get a rich reading and nothing happened. I then used compressed air to try and lean it out, nothing happened. At one point when blowing on it after using the brake cleaner it went to 13 and then shot back up to 14.8. So I am thinking the sensor is bad. I had no good narrow bad o2 to check the reading. Just wanted to give feed back on what I did.
I ended up trying what the guy recommended in the thread above. I covered the wide band sensor with a rage covered in brake cleaner trying to get a rich reading and nothing happened. I then used compressed air to try and lean it out, nothing happened. At one point when blowing on it after using the brake cleaner it went to 13 and then shot back up to 14.8. So I am thinking the sensor is bad. I had no good narrow bad o2 to check the reading. Just wanted to give feed back on what I did.
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