Not going into closed loop at idle

QWKSNKE · 03-25-2006, 07:32 PM

What causes this? If I crack the throttle very slightly (raise up the idle 100-200 rpm) car will change over to close loop.

Trying to clean up the idle exhaust fume smell. Car idles around 12.2 when the in open loop

86GT · 03-25-2006, 08:08 PM

Check the load. If the load is above 30 it will go into OL.

QWKSNKE · 03-26-2006, 07:23 AM

Load is at 20

86GT · 03-26-2006, 10:39 AM

If I recall correctley there is a function that uses the TP as a determinate of OL. I will go look.

93Cobra#2771 · 03-27-2006, 09:28 AM

Yes, there is Clint. I want to say it is 3.78v TPS that kicks open loop. If your load value isn't doing it, and your tps value isn't doing it, wonder what it could be?

Italian LX · 03-27-2006, 09:49 AM

Quote:

Originally Posted by 93Cobra#2771

Yes, there is Clint. I want to say it is 3.78v TPS that kicks open loop. If your load value isn't doing it, and your tps value isn't doing it, wonder what it could be?

Thats exactly why he is asking the question. We have already checked the LOAD and TPS values and they are not in the range to force the OL condition.

93Cobra#2771 · 03-27-2006, 11:31 AM

Hmm. OK.

How about the possiblility of going too rich/lean during that initial mash of the throttle? In other words, it goes instantly rich/lean and defaults to OL/error mode at that time. Possibility of going past the adaptability of the EEC for correction?

Maybe you could fiddle with the MAF curve at that point, or the idle fuel trim and see if it makes a difference?

I dunno, I'm grasping at straws here...

QWKSNKE · 03-27-2006, 12:02 PM

Quote:

Originally Posted by 93Cobra#2771

Hmm. OK.

How about the possiblility of going too rich/lean during that initial mash of the throttle? In other words, it goes instantly rich/lean and defaults to OL/error mode at that time. Possibility of going past the adaptability of the EEC for correction?

Maybe you could fiddle with the MAF curve at that point, or the idle fuel trim and see if it makes a difference?

I dunno, I'm grasping at straws here...

I would buy that but we are talking idle. No gas pedal and it is open loop. Crack the throttle and it goes close loop. Same issue when driving down the road, everytime my foot is on the gas pedal it goes close loop. Take my foot off the gas and it goes back to open loop (while cruising down the road)

86GT · 03-27-2006, 05:16 PM

Have you tried pulling codes.

If I recall, the eec will also go into OL if the MAF is so far out that the adaptive strategy can not bring it back in tollerance. This is a way for the EEC to ignore the MAF input and basically make the EEC act as Speed Density.

What does the WB read?

Doug904 · 03-27-2006, 05:35 PM

Yes, force it to Open loop at idle and then tune the MAF transfer until you hit around 14.7 and then turn adaptive back on and see if it goes into closed loop. If you aren't close enough it wont go. Also, if ECT temps are below 100 degree's it wont goto closed loop at idle. I dont know exactly what PCM you are using but at 180 degree's of ECT at low loads, .07-.27, the Open loop a/f is commanding 13.9 so even if it is something else your a/f is off even in Open loop.

later Doug.

03-25-2006, 07:32 PM	#1
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Not going into closed loop at idle What causes this? If I crack the throttle very slightly (raise up the idle 100-200 rpm) car will change over to close loop. Trying to clean up the idle exhaust fume smell. Car idles around 12.2 when the in open loop __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

03-26-2006, 07:23 AM	#3
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Re: Not going into closed loop at idle Load is at 20 __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

03-26-2006, 10:39 AM	#4
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Not going into closed loop at idle If I recall correctley there is a function that uses the TP as a determinate of OL. I will go look. __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.

03-27-2006, 09:28 AM	#5
93Cobra#2771 The Kocky One Join Date: Dec 2004 Location: Yeah, but those cutters won't bust any walnuts.â„¢ Posts: 1,948	Re: Not going into closed loop at idle Yes, there is Clint. I want to say it is 3.78v TPS that kicks open loop. If your load value isn't doing it, and your tps value isn't doing it, wonder what it could be? __________________ *For Sale: Reproduction Window Stickers, 87+ Mustangs, Cobras, Lightnings, and HD F150!* Richard White 93 Cobra Kocky will be back!

03-27-2006, 11:31 AM	#7
93Cobra#2771 The Kocky One Join Date: Dec 2004 Location: Yeah, but those cutters won't bust any walnuts.â„¢ Posts: 1,948	Re: Not going into closed loop at idle Hmm. OK. How about the possiblility of going too rich/lean during that initial mash of the throttle? In other words, it goes instantly rich/lean and defaults to OL/error mode at that time. Possibility of going past the adaptability of the EEC for correction? Maybe you could fiddle with the MAF curve at that point, or the idle fuel trim and see if it makes a difference? I dunno, I'm grasping at straws here... __________________ *For Sale: Reproduction Window Stickers, 87+ Mustangs, Cobras, Lightnings, and HD F150!* Richard White 93 Cobra Kocky will be back!

03-25-2006, 08:08 PM	#2
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Not going into closed loop at idle Check the load. If the load is above 30 it will go into OL. __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.

03-27-2006, 05:16 PM	#9
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Not going into closed loop at idle Have you tried pulling codes. If I recall, the eec will also go into OL if the MAF is so far out that the adaptive strategy can not bring it back in tollerance. This is a way for the EEC to ignore the MAF input and basically make the EEC act as Speed Density. What does the WB read? __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.

03-27-2006, 05:35 PM	#10
Doug904 Member Join Date: Mar 2005 Posts: 86	Re: Not going into closed loop at idle Yes, force it to Open loop at idle and then tune the MAF transfer until you hit around 14.7 and then turn adaptive back on and see if it goes into closed loop. If you aren't close enough it wont go. Also, if ECT temps are below 100 degree's it wont goto closed loop at idle. I dont know exactly what PCM you are using but at 180 degree's of ECT at low loads, .07-.27, the Open loop a/f is commanding 13.9 so even if it is something else your a/f is off even in Open loop. later Doug.