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Old 10-09-2002, 12:15 PM   #1
Silverscooby27
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2013 Mustang GT Vert
2014 335i xdrive

Default Shutting down at idle

So the Ludespeed kit is in, J&S is hooked up, and AFC is hooked up on the Phase II MY99 MAF model.

Problem is that the car will sometimes shut down at idle. Has anybody else experienced this problem? Is it an issue with SAFC tuning? Does anybody have any tips on tuning the SAFC for use with the kit? BTW, this is a Stage II kit from Ludespeed, so I'm running with the stock injectors, parallel fuel rail mod, Walbro Fuel Pump. Do I need to blow the excess air back into the intake from the BOV?

Any help would be greatly appreciated!

Joe
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Old 10-09-2002, 12:18 PM   #2
8Complex

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The excess air from the BOV venting to atmosphere is probably causing you to run massively rich. If you port it back in after the MAF, you'll most likely run fine. I've heard of people messing with the decel function of the S-AFC to get this to work still, but haven't done it myself (no need, no MAF).
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Old 10-09-2002, 03:10 PM   #3
Mariano
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Angry

Welcome to the wonderful world of MAF equipped RS-Ts!!!!

The blow-off CAN NOT VENT TO THE ATMOSPHERE You will have to mess a little bit with the "deceleration funtion" on the S-AFC; my current settings are:
2.0
7.0
2.0

When I boost more the 10 psis and let go on the gas pedal, the car tends to iddle as if it's going to shut off, but if I touch the gas (like a tap or so) and it's fine.

The Best solution: TEC-2 ($$$)

saludos,

Mariano
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Old 10-09-2002, 03:45 PM   #4
Aphex
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I vent to the atmosphere, it's all a matter of being able to read you car.... basically what I do is when going to a stop, I let off the gas and don't put in the clutch immediately, this will allow all that extra fuel to be burned out at a higher RPM. if this is not an option, I will try to tap the gas a little while I brake with the clutch in. but this is only needed when you're getting on it and then have to stop. Just cruising it should not matter since you won't be venting any boost.

the first night I had my kit on, I gunned it real hard, then put the clutch in to stop cuz I was at my destination (did a lot of 10 foot spurts ) and it died on me, I started freaking out thinking that something broke, after looking around the car for oil slicks, piston chunks, etc. logic kicked in and reminded me that it was that damn BOV.

I will have all of this taken care of with a Link ECU however sometime before next summer.
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Old 10-09-2002, 04:07 PM   #5
Silverscooby27
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Default

Thanks a lot guys, this is exactly the kind of info I was looking for. I actually opted not to buy the LINK Plus PEMS due to its complexity, but it looks like it may be something to do in the long run after people get it figured out for the MAF cars.

If anybody else has more suggestions, please post them here, especially regarding SAFC settings.
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Old 10-10-2002, 12:27 PM   #6
Silverscooby27
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So I've been assured that I can in fact vent to the atm. The thing that I'm unsure about are the AFC settings (if they can even be used for this problem) and/or maybe the BOV setting (i.e. the BOV is actually not closed at idle or there is an air leak somewhere in the system). Tom Coleman at ludespeed made the latter suggestion, and has, incidentally, been very helpful throughout the entire process.

Anybody with any other suggestions they can think of? I want to autocross this car, as well as drive it in the winter, and don't want to have to blip the throttle or think about how I'm going to stop, etc.

Thx,
Joe
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Old 10-10-2002, 05:10 PM   #7
yebokmj
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Default HKS AFR

I have mentioned this before but with the HKS AFR you can vent to atmosphere with a MAF no problem. There is nothing to play with or anything the computer automaticly takes car of it. I have a Greddy Type S blowing of to atmosphere both on my current car and my last car both Subaru MAF equipted vehicles.
Joshua
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Old 10-10-2002, 09:28 PM   #8
Delicious Tuning
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Silverscooby27,

The Link Plus is a little complex for the average joe who does not really want to tune their car. I can totally understand that, I have tuned some cars for poeple that want it tuned once and lthen leave it forever.

Other people like to tune the car themselves and with a little help from me, or other people you can figure it out in a few weeks no problem. The thing is it is not as bad as you might think.

Fixing the idle problem is a snap with the Link Plus.
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Old 10-11-2002, 10:56 AM   #9
Silverscooby27
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Default

OK, so I got the car back yesterday, and have a better description of what is happening.

The idle at times is very rough, and the car sputters and almost dies before it catches itself.

The other times it seems to almost die is when it's been sitting at a light, and I press the throttle again. The engine dips at this point, and almost dies, and I have to blip the throttle a few times to get it going again.

Finally, a CEL came on yesterday while boosted in 5th gear, when I was going up a hill.

Kinda sounds like a blown MAF to me, but I dunno. Any more suggestions?
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Old 10-11-2002, 10:12 PM   #10
Delicious Tuning
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Sounds to rich to me. I had the same problem when I was running an AFC, ITC and J&S. Lower the fuel till just about dying at idle then riase it back up about 7 points and that should help.
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