Hey guys, I have a few questions. I'm a newbie so Bear with me. A buddy of mine is not hitting normal boost and is running very lean. His aem wideband when he starts the car starts normal then the numbers creep uP untill the gauge reads just three dashes. Then when he's driving it reads super high. I belive his gauge has a bad ground....its hooked up to a hondata s300. So could a ground or bad wireing from the gauge or even wireing to the wrong pin to his s300 cause everything to be outa wack. Which would maybe cause the computer to try and compensate type of thing And that's why it's running werid? Hopefully you know what I'm talking about and can make sense of it all

 

Turn the key on but don't start it and compare the gauge to the reading in hondata. They should be the same. When you first turn the car on it should be around 14.7 and as the sensor heats up it should go all the way to lean. That will tell you if the sensor/wiring to the ECU are good.

This is based off of my limited experience with a PLX wideband so please don't go just off of this but hopefully it helps.

 

Ok thanks I'll give that a try tonight.. Could A bad ground from the gauge or a bad wire to his hondata be messing up his readings and not letting him hit full boost.. Like maybe since the hondata isn't getting the right info maybe be putting it in a limp mode or changing his settings from the tune automatically ?

 

I forgot to ask. He has the Aem eugo wideband... Since he has the hondata which wire on the hondata ecu does he have to connect the white wire from the wideband up to? I'm just. Courious so we can double check the wireing? Bc I herd d-10 and others say d14

 

Bad grounds/ poor wiring can cause a ton of problems. Check the gauge and computer to make sure they read the same.

Will it not build boost or does it act like it hits the rev limiter? If it is running lean then there could be a lean boost cut that is there to help you not damage the engine.

I have mine wired to D10. The PLX has both wideband and narrowband outputs. I am not sure about the AEM though. Make sure that you wire the wideband output into D10. Then you can select in the software to use wideband input for closed loop operation. I don't have the narrowband hooked up to anything.

 

the car was tuned professionaly to run 18 pounds, and hes only hitting 12-13 at full throttle. thats why i didnt know if a bad ground on the gauge itself is throwing stuff off, or something wired wrong to the computer could mess it up. like if the computer is trying to change stuff on its own bc its not getting the right reading bc of something.

 

Sounds like more of a boost leak or boost controller issue. If the computer cuts it out because it's too lean I would imagine that it would feel like boost cut where it just quits revving instantly. Check all of the vacuum lines going to the boost control solenoid and the wastegate as well as any other lines that could be leaking boost. What size wastegate spring does he have?