Odd things happening after S-AFC install

[Jackyll]

I was having a few problems with how the car was running...
- CEL on... autozone said it was a MAS problem
- Bad idle... went anywhere from 400 to 1100rpms
- Always bogged in 1st gear
- If I ever let off the gas and tried to get back on it at 3000+ RPMs... the car would bog horribly.

I went to install my S-AFC today, and when I removed the left panel to get to the ECU, I saw a S-AFC harness already there. It was all wired up how it was supposed to be, just wasn't connected to the actual SAFC unit. However, it must have been a harness for the original SAFC... not the SAFC2, because the harness I have (SAFC2) has an extra pin (knock sensor?). So, i cut out the old harness and installed mine... reconnected the negative on the battery. Here's where things got better... CEL was gone... figured it'd come back on after a few minutes of having the car running like last time I reset the ECU. Drove around for about 20 minutes... never came back on. Ran a couple errands... still not on. Car doesn't bog anymore... anytime. And my idle is much better... starts out kind of high... 900-1100rpm, but once the car warms up it's in the 700-800 range. Feels like a completely different car! Can't wait until I actually get it tuned!

Could all of my problems really just have been because there was a SAFC harness wired to my car but not connected to anything?

Just thought this was interesting, and was wondering what you guys thought.

Thanks

 

[JiveMasterT]

thats really friggen weird. you would think that a wire is a wire... whats the difference. musta been the black wire in question.

 

[boostedinaz]

That is the whole point of an AFC. It interupts the signal from the MAF to the computer and changes it. If the AFC isnt there then the MAF isnt connected to the ECU.

 

[carbonfire]

exactally.... you had no MAS signal going to your computer at all with out the S-AFC installed... That is the reason you had soo many problems before, and why your CEL was on. It is still strange that the person who sold you the car dident hook it back up.

 

[DBR01]

exactally.... you had no MAS signal going to your computer at all with out the S-AFC installed... That is the reason you had soo many problems before, and why your CEL was on. It is still strange that the person who sold you the car dident hook it back up.

Well, it really depends how the harness was spliced. If the wires where snipped and the only way they connected was through the SAFC, then yes that was your problem.

 

[carbonfire]

Well, it really depends how the harness was spliced. If the wires where snipped and the only way they connected was through the SAFC, then yes that was your problem.

I dont think they can be hooked up both ways..... that would skip over the S-AFC than and you would not be intercepting a signal... it would be very bad for the AFC.

 

[boostedinaz]

Well, it really depends how the harness was spliced. If the wires where snipped and the only way they connected was through the SAFC, then yes that was your problem.

You can only hook it up one way and have it work. For the AFC to change the MAf signal it need to interupt it before it gets to the ECU. If you have an AFC go unplug it and start the car, let me know what happens.