Open loop mode??

89LX50Coupe · 06-10-2001, 05:48 AM

My Superchip burned up my ECU, so I replaced it. The new ECU didn't come with a chip, so I am just running it without one(Open Loop Mode or something I believe). The car seems to run perfect. I can tell a slight loss in performance, but it still runs great. I put about 75 miles on it like this and now my Check Engine Light will flash on and off every now and then. Like it will blink twice, and then nothing for 10 mintues, then it will do it again. Like I said, it doesn't seem to be running bad. Could that light flashing be caused by not having a chip on the ECU? Will it hurt my car by running it with out a chip on the ECU? Thanks!

jimberg · 06-10-2001, 01:23 PM

Pull your codes and it will tell you. I think you should go to a junkyard and get a chip, though.

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351W 89 Mustang GT Convertible

Unit 5302 · 06-11-2001, 01:03 AM

Have you bumped the timing yet? If you do, you'll probably recover most of the performance drop you have been feeling. I think you'll be just fine running the stock ECU. Open loop mode is only when you are floored. When you are just driving around, you are in what's called "closed loop" for emissions concerns.

I'd be suspect of the O2 sensors. They can cause that problem to surface. Pull the codes and see what comes up.

Good luck!

Kell

Mach 1 · 06-11-2001, 10:00 AM

I agree with Jimberg, search the junkyards for another chip. Especially after it burned up your ECU.

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1993 GT/AOD
'93 Mustang GT

[This message has been edited by Mach 1 (edited 06-11-2001).]

06-10-2001, 05:48 AM	#1 (permalink)
89LX50Coupe Registered Member Join Date: Jun 2001 Location: Conway, Ar, USA Posts: 9	Open loop mode?? My Superchip burned up my ECU, so I replaced it. The new ECU didn't come with a chip, so I am just running it without one(Open Loop Mode or something I believe). The car seems to run perfect. I can tell a slight loss in performance, but it still runs great. I put about 75 miles on it like this and now my Check Engine Light will flash on and off every now and then. Like it will blink twice, and then nothing for 10 mintues, then it will do it again. Like I said, it doesn't seem to be running bad. Could that light flashing be caused by not having a chip on the ECU? Will it hurt my car by running it with out a chip on the ECU? Thanks!

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06-10-2001, 01:23 PM	#2 (permalink)
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,088	Pull your codes and it will tell you. I think you should go to a junkyard and get a chip, though. ------------------ 351W 89 Mustang GT Convertible

06-11-2001, 01:03 AM	#3 (permalink)
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,235	Have you bumped the timing yet? If you do, you'll probably recover most of the performance drop you have been feeling. I think you'll be just fine running the stock ECU. Open loop mode is only when you are floored. When you are just driving around, you are in what's called "closed loop" for emissions concerns. I'd be suspect of the O2 sensors. They can cause that problem to surface. Pull the codes and see what comes up. Good luck! Kell

06-11-2001, 10:00 AM	#4 (permalink)
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,864	I agree with Jimberg, search the junkyards for another chip. Especially after it burned up your ECU. ------------------ 1993 GT/AOD '93 Mustang GT [This message has been edited by Mach 1 (edited 06-11-2001).]

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