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Old 07-13-2004, 12:39 AM   #1
blackbeast23
Scooby Newbie
 
Member#: 64286
Join Date: Jun 2004
Location: Louisville, KY
Vehicle:
1999 Impreza 2.5RS
Black

Question Engine Hiccup

Ok, so I got my SAFC II installed over the weekend and I was able to get the car to idle normally now, but I ran into a problem tonight. First, let me share some of my settings:

Lo-Throttle- Starting at +10%, gradually decreasing per each RPM point.

Hi-Throttle- Starting at +3%, gradually increasing per each RPM point.

For those who don't remember my setup, I'm running a Garrett T25BB turbo at 6psi.

I've been driving the car carefully since the AFC install, and since I am waiting for my new clutch to come - I wanted to fool around with the settings on the AFC.

Tonight, I was cruising for a few minutes and decided to give the car some gas down a short straightaway. The clutch was slipping like usual, but I came up to a stop light. From the stop light I started to go slowly up through the gears, but when I hit second, the car shook violently for just about a second. It felt like the car tried to pull itself back, and the RPMs dropped dramatically, but then the engine continued on like nothing had happened. I pulled off of the main road and down a side street because the event got me worried. From a stop sign I tried to get going again and the car did the same thing, only for a second, and kept going. I finally decided to limp my way home and while I was in my neighborhood it did the shake issue one last time... only this time the check engine light came on. I checked the knock sensor the last two times this happened, and all seemed fine. It's almost as if the engine hiccups when trying to get going.

The first time it did the hiccup, I thought it might have been the clutch, but the second and third times, the car actually feels like it stops, or pulls back for a second... and then the check engine light coming on made me think otherwise.

Does this sound like a fuel pressure issue? I do have an upgraded fuel pressure regulator on the system.

Also, can someone else that has the Apexi SAFC II unit post some ballpark figures for the Lo and Hi-Throttle's. Am I in the right direction, or am I completely wrong? I'm gonna try to get access to an EGT to do final tuning.

Sorry for the long story...
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Old 07-13-2004, 07:52 PM   #2
blackbeast23
Scooby Newbie
 
Member#: 64286
Join Date: Jun 2004
Location: Louisville, KY
Vehicle:
1999 Impreza 2.5RS
Black

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::nods:: I figured the problem out. It was my MAF sensor connector. The previous owner of my car did something to the harness of the sensor and there is now a male to female plug to connect one of the wires. I had zip tied the wires back a little so they would be out of the way, but I did it too much. When the air filter needed to move with the engine, it pulled the wire apart.

I would still like some info on the SAFC settings of other 2.5 owners. (I've got a 99)

Thanks!
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