Fuel Cut...What is it and do I have it?

[mazda20]

Okay this is kinda a continuation problem from the Apexi S-AFC Thread, but each problem should deserve its own spot.<P>Okay to bring everyone up to speed, I got the idle problem straightened out (BOV was bad). Now I think I am having a fuel cut problem, because whenever I begin to accelerate hard and I start to carry boost the engine just dies I get no response when I push the accelerator, I have to disengage the clutch and sometimes shift to a higher gear. Is this fixable and what is it?

[maldo]

Doesn't sound like fuel cut - that would hit hard and abrupt. Is it stuttering at all? Has the check engine light come on when this happens? The parameters that you have set on the S-AFC could be too extreme for the ecu and it may not be able to compensate for the adjustment.

[mazda20]

Well this is hard and abrupt, I might be in first gear and begin to accelerate and all of a sudden I feel my head about to go through the front window. I have no LEDs on my Air/Fuel Gauge and no response from the car.<P>What I am going to try is disconnect the AFC and reset the ECU and run the car off the ecu, because before I had the AFC in I did not have this problem, but I was hoping someone new these types of symptoms for this problem.

[monty73741]

i am having the same problem...my mechanic thinks its the ecu is bad......<BR>maybe you should switch your ecu to a protege or 323gtx ecu...<P><BR>jason

[mazda20]

I don't believe that either of those will work with the 94 MX-3 ECU harness correct me if I am wrong.

[monty73741]

i thought that it would work.......is there a difference between sohc and dohc wiring harness<P>jason

[OsoSlo z28]

the harness clip on the dohc will not fit the sohc and/or protege ecu.

[mazda20]

It doesn't really matter because I don't believe my ecu is gone anyways. This was all started as soon as I installed the AFC.<P>Does anyone know if this problem is fuel cut or not?

[Swego]

Just wild guessing here but maybe the stock ignition has difficulty providing fire if there is too much fuel/air into the chamber. Maybe you can try an aftermarket ignition kit?

[maldo]

Just a thought from the previous reply. I remember my motor bucking slightly, almost a hesitation, but not hitting to terribly hard. Check your plugs, they could just be fouled a little from too much fuel. I am not sure of your current setup but if you were running something similar to what I had - B6T, pro lx ecu, b6t injectors no S-AFC- prior to the install of the S-AFC it could be the culprit.

[mazda20]

Maldo, your right it was the S-AFC piece of crap, I hooked it up according to Apexi and my mechanic here, what was happening was my MAF sensor was sending the correct voltage but for some reason it was coming out messed up from the AFC. I pulled it out after w had already checked the ECU, Timing, Fuel Pressure, Injectors, Plugs, and even the MAF.<P>So my thought is maybe these don't quite work right with a 94+ Hotwire DOHC B6E MX-3. I will call Apexi about it, but needless to say this is not going in my car if thats how it is going to work.

[cjthor]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Kick @#$ Mazda:<BR><STRONG>Maldo, your right it was the S-AFC piece of crap, I hooked it up according to Apexi and my mechanic here, what was happening was my MAF sensor was sending the correct voltage but for some reason it was coming out messed up from the AFC. I pulled it out after w had already checked the ECU, Timing, Fuel Pressure, Injectors, Plugs, and even the MAF.<P>So my thought is maybe these don't quite work right with a 94+ Hotwire DOHC B6E MX-3. I will call Apexi about it, but needless to say this is not going in my car if thats how it is going to work.</STRONG><BR><HR></BLOCKQUOTE><BR>What HW setting did you finally end up using? My car gets a wierd a-- idle when i hook up my afc. Usin hw11