Ok im out of town and im driving around and i notice my a/f jumping all over the place say 10 to 19 a/f back n forth!!!

ok had this problem before found out the map sensor wasnt sodered correctly so the AEM wasnt responding and my car was cutting out at diff trottle response!!!fixed it

now i think this is whats going on again so i mess with the wires and no stall so i know it wasnt the wiring this time

so i said screw it drove it back to the house and here comes the labtop

now im reading 300 psi and my air temp is at -47 degrees so i check to see if its on reading on psi and its is so again

then i start it and the a/f is at 14.7 at idle so i drove it around a bit and the air fuel only moves when i decel and at wot it goes off the carts rich..

i dont understand why would my air temp say -47 mabe i blew a fuse or worst case fryed the ECU???

and the tune was awsome and it ran fine for 2 months with the same map??

 

make sure your IAT sensor is wired in , or the harness is all the way in on the sensor.

I had that happen to me as well one time puttin my upper IC pipe back in and forgot to hookup the harness to the sensor it read the -47 as well.

Is the IAT wired into the maf harness or directly to the AEM?
It shouldnt matter as Buschur wired mine into the maf harness obviously it has the appropriate 2 pin wires

Wow 300psi crazy , how did you hook up the map sensor is it remotely mounted with boost/vac line going to it ?
Or did you use the buschur adapter plate and mounted it directly on the manifold?
Try to see what voltage output you are getting from the sensor that could help narrow down wether it is working properly . I believe it is only a 0-5volt sensor

 

i did not check the air temp sensor wiring yet would that effect the map sensor??

and yes i have the buschur adapter and i know the map sensor is wired correctly maybe it went out on me????

i havnt checked the voltage output yet but ill get on that asap when i get back in to town will that tell if my sensor is any good or not or even working???

and thanks steelcityevo8 for the reply and help!

 

well considering that the map sensor reads pressure based on voltage then yes , observing the voltage coming from the sensor might tell you something

connect to your ecu then go up to the setup dropdown / go to sensors / go to manifold absolute pressure / go to paremeters amongst those paremeters should be map volts. You should be able to observe the map volts at that time. Just to see what kind of output the ecu is recieving from the map sensor. Its a start

something has to be telling your AEM box 300psi and the map if you are converted to speed density should be its only resource for such info.

 

thanks when i get back in to town friday ill see what happends and once again thanks