GoodfellaFD3S

iTrader: (213)

As the subject says, when I'm cruising to a red light or stop sign in neutral, my idle will drop to anywhere from 500rpms to almost zero, then jump to around 1500, then up, down, up down. It happens sporadically, about half the time. When I stay in gear and let the car engine brake down to around 2k rpms, then throw it in neutral, the effect isn't as bad. Also, when the revs drop, the vacuum gets worse (toward zero), and vice versa.

This is really pissing me off. Never happened on the stock motor. Is this a tuning issue ??

Please help guys!

A-Spec

yeah it is definately a tuning issue. I had that problem after I got my motor ported and the Power FC. My friend took my car and lightly tuned it and the idle just smoothed out.

if you look on the power fc your injector duty goes to 0.0% when your idle starts hunting.

David

PS btw spyfish's map diden't work too well on mine

spyfish007

too bad they didn't work for you . . . my next set of maps will be for non-sequential, FMIC, and 850cc pri & 1200cc sec injectors. I'm starting to smell FUN!!

GoodfellaFD3S

iTrader: (213)

Other than that one problem his maps have worked great for me. So does anyone else have this hunting idle problem or is it just me? What tuning can I do to get rid of it?

Rich

93vrfd3s

I have the same problem. Just put the Power FC in my FD. I did this as a result of the recent mods I have done to the car including Bonez downpipe and hi flow cat with a Greddy PowerExtreme Cat-back. I then included a M2 Performance intake. I was informed that it was time to put in an ECU upgrade so I contacted SR Motorsports and purchased the Power FC with the commander and had them program it with the mods that I just listed.

I put it in last weekend and found that I was having the same problem with the hunting idle. I called SR and they informed me that I needed to let it learn the car. I did this for 2 days and still no stable idle. I called them again and they have told me that it may be an intake gasket leak. If that doesn't solve the problem I can call them back and they will walk me through setting the idle up 6 points.

ApexRX7

I have the same idle problem but I do not have the PFC. I have a reprogrammed ECU with the SAFC and the Apex single turbo kit. Anything I can do to fix the idle w/out the PFC or would buying one help smooth out the idle? Any suggestions? Thanks!

Leadfoot

93vrfd3s,

If that doesn't take care of it, could you post the procedure they give you to correct this please?

thanks

A-Spec

I think there were some previous posts about this and they suggested the idle bleed screw? but it's by the elbow and the throttle body and it is well hidden. do a search for it maybe the old posts still exist.

David

xmatt

I had this exact problem as well and I finally figured it out just a week or so ago... may not be the same cause as you're having, but it's easy to check.

What I discovered is that the PFC is pretty smart about "learning" your engine. You've probably noticed the settings for idle in the Commander.. there are settings for normal conditions, electrical load, A/C-on etc. So for example when you turn your A/C on, it revs the engine up to a slightly higher rpm. The problem comes when you shut the car off, but have a turbo timer. What I discovered was that if I have the A/C button on while the turbo timer is leaving the engine going, the A/C is actually disengaged. However, the PFC still sees a running engine and the A/C button on, so it tries to bring the engine back down to the proper idle speed. After a couple minutes of this, it thinks it now knows the engine better and when you start the car (and the A/C) again, the idle drops down too low, forcing it to"recover" to keep the engine from quitting. It then hunts up and down, not wanting to rev too high, but not wanting to die. This happens whenever you bring the car back down to idle until you give it time to relearn.

So my suggestion is this: start the car and let it run with the A/C on for several minutes so it learns correctly. Then, every time before you pull the key, turn the A/C button off so it doesn't try to relearn incorrectly. Once I did this, I never had a problem with idle again. Of course this assumes you have a turbo timer, but it seems like most people do.

Hope this helps..

matt

SPOautos

Matt, thats interesting. I'll have to try that and see if that resolves the prob. Think for the info

Later,
Stephen

GoodfellaFD3S

iTrader: (213)

I have my AC fuse pulled and always have my AC running while the car idles w/the turbo timer to run the fans and cool the engine bay. Maybe this is my problem? Interesting...

Rich

Dolomite

didn't bother reading the thread, but my PFC+old stock motor idles like a champ. 750 rpms on the money without faltering.

These engines will hunt (and gather) when temperatures get out of hand regardless of ECU. For example, heatsoak: turn your car off at 93*C, go to the store buy some cigs (wait in line) come back and your engine will be at 120*C. The car will hunt for idle until you start driving and shake off some of the heat.

This happened to me with the stock ECU and PFC.

Under normal operation, it's holds the idle *rock* steady.