Temp question (Topic Split)

QWKSNKE · 01-12-2005, 05:19 PM

I thought the only temp that determined closed loop/open loop was the 02 heaters.

If what brad says is true, why does the car go into closed loop 2 minutes after startup regardless of engine temp?

95GTMan · 01-12-2005, 05:42 PM

Quote:

Originally Posted by Italian LX

Or you could just pull the Binary up using the TwEECer software and see where it's set at.

You said TwEEZer.

Italian LX · 01-12-2005, 05:49 PM

Quote:

Originally Posted by 95GTMan

You said TwEEZer.

Sendero · 01-12-2005, 05:52 PM

Mine goes CL on a time limit. The engine temp is only used for the ECT adders for spark and fuel.

Wicked · 01-12-2005, 07:19 PM

From the "Inner Workings of the EEC-IV"

There are two methods of EEC fuel control, Open Loop and Closed Loop. The EEC starts in Open Loop and based upon time and engine parameters such as engine temperature, changes to Closed Loop.

QWKSNKE · 01-12-2005, 09:43 PM

Quote:

Originally Posted by Wicked

From the "Inner Workings of the EEC-IV"

There are two methods of EEC fuel control, Open Loop and Closed Loop. The EEC starts in Open Loop and based upon time and engine parameters such as engine temperature, changes to Closed Loop.

guess the tweecer stuff is wrong then

Wicked · 01-13-2005, 05:11 AM

Quote:

Originally Posted by QWKSNKE

guess the tweecer stuff is wrong then

Noone said that, TwEECer is not a stock ECU though right?

I'm just posting the evidence I have, none of you know-it-alls have posted anything to the contrary.

Other evidence that coolant temp affects when the ECU enters closed loop...
EEC IV Code: P0125 Insufficient Coolant Temperature to enter Closed Loop.

Italian LX · 01-13-2005, 05:13 AM

Quote:

Originally Posted by Wicked

. . .TwEECer is not a stock ECU though right?

Actually, the TwEECer just alters the parameter of the stoxk ECU.

QWKSNKE · 01-13-2005, 05:20 AM

Quote:

Originally Posted by Wicked

none of you know-it-alls have posted anything to the contrary.

I haven't because I can't rememeber where I read it at. I think that it was in the notes field of one my tweecer tables.

93Cobra#2771 · 01-13-2005, 08:52 AM

The ultimate decision maker on going into CL from OL is time. No matter what the engine temp is, the car WILL switch to CL after 120 sec/2 min.

Quote:

There are two methods of EEC fuel control, Open Loop and Closed Loop. The EEC starts in Open Loop and based upon time and engine parameters such as engine temperature, changes to Closed Loop.

The temp is a modifier to the time. In other words, if it gets up to temp quicker, it will go into CL quicker. However, temp will not keep the EEC from going into CL after the 120 sec. limit.

To recap: Time is the ultimate factor, with temp as a modifer to that...

I'll have to do a little digging on the error code and what it exactly means. I can't figure out which paramter affects the switch, with the little bit of digging I did. BTW, the code you reference, is that a fox body or on your 01 model? If 01 model, then that is why - 94 up models base the switch to CL on the O2's temp, and has nothing to do with time. Basically switches over within a few seconds of startup, if it isn't too cold outside...

01-12-2005, 05:19 PM	#1
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Temp question (Topic Split) I thought the only temp that determined closed loop/open loop was the 02 heaters. If what brad says is true, why does the car go into closed loop 2 minutes after startup regardless of engine temp? __________________ 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

01-12-2005, 05:52 PM	#4
Sendero Im gonna show her my... Join Date: Dec 2004 Location: Somewhere providing FREE tech support. Posts: 4,269	Re: Temp question Mine goes CL on a time limit. The engine temp is only used for the ECT adders for spark and fuel. __________________ I heard it on the internet, so it must be true. "I believe that a person's moral compass can be determined by how he references free men the right to defend themselves." T. Nugent "An armed society is a polite society. Manners are good when one may have to back up his acts with his life." R. Heinlein "Never argue with an idiot. They drag you down to their level, then beat you with experience." -Unknown

01-12-2005, 07:19 PM	#5
Wicked Friends Join Date: Dec 2004 Location: Pell City, AL Posts: 1,371	Re: Temp question From the "Inner Workings of the EEC-IV" There are two methods of EEC fuel control, Open Loop and Closed Loop. The EEC starts in Open Loop and based upon time and engine parameters such as engine temperature, changes to Closed Loop. __________________ 2001 Cobra 'Vert Procharged and Intercooled 455rwhp/441rwtq Work Car: 2005 Honda Odyssey 400 whp Turbo V6, 6-speed, full cage, H&R Suspension, Brembo Brakes