*HELP*DSM afc related

[tallrd]

ok, so I installed DSM's afc on my car ~250 miles ago. It started out working fine, and then gradually began losing some of the smoothness (especially at cold idle). Granted, some of that may have just been the ecu re-learning a/f's and not the actual DSM, but what happened today could in no way be mistaken for "normal."

I fired up the car and it was idling like it was on the verge of dying--REALLY rough and chuggy like it was getting all fuel or something. What's worse, is I tapped the gas (normally--since DSM install--makes this go away) and it didn't respond. So I punched the gas to the floor for a few times and it still didn't seem to respond. Finally, I just held down the gas pedal (still at a stand-still), and after a second or 2 THEN it responded. I'm affraid this will only get worse based on the progression from the last 250 miles.

Anyone else have this issue? What to do? (huh)

 

[TenaciousB]

what map are you using again? Its the one for the fmic right? I might try to load the "base" supermap or something and see how it runs? If you haven't tried that already. I wonder if it does the same thing with the different maps. If it does, then you might be able to narrow it down to something else. I thought that the stock msp ecu could not "read" or adapt to the afc? Is there any way to determine if you are running too rich still? maybe some sort of a/f gauge? Could it be possible that you are not getting enough fuel? maybe injector(s) problem?

 

[31R]

Same thing was happening to me. I have a FMIC, so naturally i would download the FMIC map. Well the car does not run to well with the FMIC map. It stutters between 3000-4000 rpm and a ruff idle at start up. I change my plugs, cleaned my EGR and IAC. I was running better with the superstock map. But i thought i would try the FMIC map again for kicks, all of a sudden i get a cel and the car does not run well. Not sure what it can be but i am going to put the Superstock map back in until i get a custom map. How do i check to see what my cel may be?

 

[Paul]

^bring it to autozone they will check it for you. but they will not clear it

 

[speed1016]

MIne has been doing it for about a month now. Ive been trying to schedule a dyno but it wont be until the end of the month! Ive have since took my boost controller off completly and am running at 6.5 psi. And it still does it until the engine is warm. Ive noticed lately that if I drive the car until fully warm shut it off and then drive again about 20-30 later it does it even though the engine is still warm?

 

[Mallard]

This shouldn't be AFC related. The AFC is not changing any values from the stock ECU when not in boost. Unless for some reason your vaccuum source going to the AFC isn't right.

 

[speed1016]

right off the manifold. And only does it when its hot plus the fact that it didnt do it before the afc was hooked up. Im waiting to get my a/f readings from the dyno to find out was going on. I already contacted dsm with the info. I hope nothing major happens on my forged internals on stock boost though. Any thoughts?

 

[speed1016]

Im going to try and use the stock plugs and see if that helps. I installed them shortly after the afc? maybe that will help

 

[noclue119]

This shouldn't be AFC related. The AFC is not changing any values from the stock ECU when not in boost. Unless for some reason your vaccuum source going to the AFC isn't right.

This is AFC related. I had this happend to me about 3 months ago. I thought it was a vac leak or a ERG valve or a IAC. I took the AFC off and it went away. I took it to the dealer for a checkup and they said hte ERG valves were good, no vac leaks were found and the IAC is perfectly fine. I PMed DSM about it and he said he is goign to work on something to use the AFC to control Idle.

Here is my conversation with DSM





<TABLE class=tborder cellSpacing=1 cellPadding=6 width="100%" align=center border=0><TBODY><TR><TD class=tcat colSpan=2>Private Message: Re: AFC controller</TD></TR></TBODY></TABLE><!-- post # --><TABLE class=tborder cellSpacing=0 cellPadding=6 width="100%" align=center border=0><TBODY><TR><TD class=thead style="FONT-WEIGHT: normal"><!-- status icon and date -->

05-23-2005, 12:43 PM <!-- / status icon and date --></TD><TD class=thead style="FONT-WEIGHT: normal" align=right></TD></TR><TR vAlign=top><TD class=alt2 width=175>DSMConvert<SCRIPT type=text/javascript> vbmenu_register("postmenu_", true); </SCRIPT>


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</TD><TD class=alt1><!-- icon and title -->Re: AFC controller


<HR style="COLOR: #d1d1e1" SIZE=1><!-- / icon and title --><!-- message -->Cool yea just keep me updated. If nothing else I may be building a map to control idle also. Alot of people, both with and without my afc have been having idle problems lately and our afc is more than capable of controlling it, would just require some adjustment.



Quote:
<TABLE cellSpacing=0 cellPadding=6 width="100%" border=0><TBODY><TR><TD class=alt2 style="BORDER-RIGHT: 1px inset; BORDER-TOP: 1px inset; BORDER-LEFT: 1px inset; BORDER-BOTTOM: 1px inset">Originally Posted by noclue119


John,
I've put it on a wideband and a narror band, both show the same. As for my mod, its totally stock. I'm goign to take it in this week for some other problems, i'll have them check the IAC while they are at it. Anyways i'll keep you up to date. And thanks for the fast response.

-Ying

P.S. I've been driving for 2 days now and I've not really had the idle problem so far but we will see.


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I've not heard anything about it since. From what I saw was happening was the car was running more lean at idle and it was creating problems Idling because the IAC position was not changing and it created a rough idle. However, I've never had it throw a CEL. I did however had the car die on me idling three or four times.

 

[Mallard]

Nevermind you edited and answered my question

 

[noclue119]

Air Fuel ratio

 

[Mallard]

Air Fuel ratio

I know what a wideband is. You origanally showed the quote that said the wideband and narrow band showed the same thing, but never stated what that was. You have since edited and added that info.

 

[noclue119]

I know what a wideband is. You origanally showed the quote that said the wideband and narrow band showed the same thing, but never stated what that was. You have since edited and added that info.

oh hehehhe sorry i caught that reading my posts

 

[mofoaka]

This shouldn't be AFC related. The AFC is not changing any values from the stock ECU when not in boost.

actually it does effect the fuel at idle.. however with the fmic map and the super map.. the preset values are at 10 during vacuum( which means neutral or untouched) so there isn't any changes within the map itself when not in boost. personally i had this problem when i first started my car with the afc, however discreet and i went out for a little run and tune and we had to adjust the values within the vacuum and also in boost. so in result... that night i learned that the afc does control the fuel during boost and vacuum. learn something new everyday


btw... this is my map i'm using. use at your own disgression. any harm done to your car will not be my fault... because all cars are different so it might not be the best map for your car, but it did help fix my hesitation and horrible idle. if you do plan on trying this map. try not to push it very hard unless you have WB that way you'd know if your lean or rich.

my mods: 2.5 dp, custom hard pipes with FMIC, walbro fuel pump and msp ecu ( i have a p5)


http://www.msprotege.com/members/mofoaka/semi%20tuned.mdb

 

[Mallard]

Well Speed1016 and Noclue119 have a similar problem and they said they're stock. The car should run just like stock then as long as the AFC is reading the proper manifold pressure, you agree? With no other mods there should be no reason to provide anything but a 10 in the vaccuum colums, right?

I've been running the AFC since the first group buy in the fall without having this problem (I'm otherwise stock). If this started with the install I would go back through and check all your wires and hoses. Also check anything that you touched during the install to make sure no lines are kinked, etc.

 

[noclue119]

Well Speed1016 and Noclue119 have a similar problem and they said they're stock. The car should run just like stock then as long as the AFC is reading the proper manifold pressure, you agree? With no other mods there should be no reason to provide anything but a 10 in the vaccuum colums, right?

I've been running the AFC since the first group buy in the fall without having this problem (I'm otherwise stock). If this started with the install I would go back through and check all your wires and hoses. Also check anything that you touched during the install to make sure no lines are kinked, etc.

i was watching the car's inputs on a laptop and recorded it all at vac it showed it was pulling values of 10. But the value of 10 does not = 100% untouched. I just never figured out what it was doing.


and believe me i checked all the wires, all the vac hoses. Everything

 

[mofoaka]

Well Speed1016 and Noclue119 have a similar problem and they said they're stock. The car should run just like stock then as long as the AFC is reading the proper manifold pressure, you agree? With no other mods there should be no reason to provide anything but a 10 in the vaccuum colums, right?

very true i agree, the car should run stock at 10 in the vaccuum columns however since they do have a problem and i did also, i would try to mess with the afc a little. but of course that's if they want. but i fully agree that at the values of 10 in all the vaccuum there shouldn't be a change in the performance of the ecu and fuel delivery at stock. however i had a difference in idling and even in boost possibly due to my walbro.

 

[Mallard]

Hmm...well it's odd that with the same maps on the same cars (both stock) that one would have a problem. Software only does what you tell it to so they should function identically as long as they're wired the same.

 

[noclue119]

well i since got rid of my unit

 

[Mallard]

very true i agree, the car should run stock at 10 in the vaccuum columns however since they do have a problem and i did also, i would try to mess with the afc a little. but of course that's if they want. but i fully agree that at the values of 10 in all the vaccuum there shouldn't be a change in the performance of the ecu and fuel delivery at stock. however i had a difference in idling and even in boost possibly due to my walbro.

Yeah, if your fuel pump was helping to supply more fuel (which it most likely was) then I can understand why you had to re-tune those columns.