More problems! Ahhh. This thing is seriously falling apart. I've never had so many problems with the car, I can't keep up! Please help, again.

The setup: Comptech SC, Ap2 pulley (6psi), VAFC, UEGO

The problem: Car drives fine, AFR's are fine, everything's great. All the sudden, anything over VERY light throttle is very rich. UEGO reads 10.0 (minimum reading) and the car bogs like crazy. It's very difficult to get rolling from a stop b/c it's so rich, feels similar to heat soak, but it's like 70 degrees outside. If I rev the car past 6000 rpms or so there is a squeeling/squeeking noise coming from under the hood that gets progressively louder (although I haven't taking it past 7000 or so).

I know a lot of you guys hate the vafc and want to bash it any chance you get, but I REALLY don't think that's the problem. The car has run fine with it for 10,000 miles. I've rechecked all the connections and everything is tight and correct.

I thought it was a FPR problem, I took it off and apart today. Everything looked to be working. Nothing seemed out of the ordinary and being that it's mechanical, not electric it seems like a problem with it would be apparent (although I could be wrong).

So... what is under the hood, can cause the car to run very rich, squeals loudly when it malfunctions and has the ability to repair itself so it works fine half the time?

 

When I had my emanage I had the same problem, running rich upon <5% throttle. Its a limitation of a piggyback system since when I upgraded to the AEM EMS (changed nothing else) that problem went away.

 

I know you said you didn't want to hear it, but ditch safc. Seriously, those things are like the atari of the console world and you don't need on comptech kit running 6psi.

Also what are you doing for spark plugs? When I had my s2k, the copper plugs swapped out every 4k miles worked wonders compared to the platnium/iridium junk.

 

Spark plugs are whatever all the other SC guys are running, (NGK 7173, I think). I change them everytime I do the oil. I guess I'll pull the VAFC out tonight, if that's the problem I owe you guys a beer, but I hope you're not too thirsty.

If anyone has any other ideas they would be greatly appreciated.

 

^ have you checked your belt's condition and if it has any play?

 

Yeah, belt is tight.

 

Check the map sensor and the ducting in the throttle body. Wrong signals to the ECU from a blocked passage to the MAP sensor can cause it to go pig rich.
It happened to me.


Also, ditch the piggyback.

 

btw, are you getting a CEL? If so, are you able to pull the code?

 

definitely check the map, and see how the belt and piping is doing. There has to be something different that is making the noise under the hood. Can you do you pressure test on the tubes? see if there is a leak?

 

It's not throwing a CEL. I've tried the MAP whack, maybe I'll step it up to the MAP SMASH when I get home

I appreciate all the advise, and plan to investigate any ideas you guys can offer, but would any of these problems (aside from maybe a slipping belt) result in the squeeling sound above 6000rpms? This isn't any quiet supercharger whine, it's more of a stuck pig kinda squeeling.