LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Deleting emissions stuff. Help!!!

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Old 12-19-2010, 03:28 PM
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Originally Posted by c_smalling
AA diagnosed my light with a OBD II scanner(?)
Upon reading the codes it was discovered that at least 1 of the pre cat O2 sensors were throwing codes. Now, it has been at least a year and I can't remember too many of the specifics.
I believe that you are saying that the codes have nothing to do with the air pump being gone., soo...
I just need to replace the offending o2 sensor(s) and I'll be good to go.
Wait... wuuuut?!?!?! An OBD II scanner on an OBD I car?
Old 12-19-2010, 03:29 PM
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Oh if a SES light is all that will happen, sounds great. Light is already on.
Old 12-19-2010, 05:57 PM
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I didn't say it was an OBD I. Yes I get the SES light. Like I said, it has been quite awhile so I don't remember the exact code(s). I might just take it to AA tomorrow for fun, to get the code #'s. If a new O2 sensor will put the car back into closed loop then I'll try it.
Old 12-30-2010, 09:59 PM
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ok so i went to delete the evap and when i went to delete the purge solenoid { i guess thats what it is} everything went fine untill i unplugged the wire going to it. now i get a ses light. what now? am i doing something wrong?
Old 12-30-2010, 10:37 PM
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You're deleting a critical emission component, so of course you'll set an SES light. You need to have it programmed out of the PCM.
Old 12-30-2010, 11:45 PM
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But until i get it tuned out it wont hurt anything to go ahead and delete it right? And it wont affect my performance?
Old 12-30-2010, 11:48 PM
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It won't hurt anything performance-wise, but your cooling fans will be on all the time due to the SES.
Old 12-30-2010, 11:58 PM
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Yeah i noticed that when i unhooked it. Thats ok i can live with that. SO will it be ok to do the egr the same way? Delete it now and have it programmed out later?
Old 12-31-2010, 12:07 AM
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Originally Posted by 95zguy
Yeah i noticed that when i unhooked it. Thats ok i can live with that. SO will it be ok to do the egr the same way? Delete it now and have it programmed out later?
Yes and no.

With the SES light on, you won't be able to tell if any other problems arise other than the EVAP and EGR. That's completely up to you, but I personally wouldn't want my SES light staring me in the face for no reason, especially if a code 16 popped up.
Old 12-31-2010, 12:15 AM
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Call me stupid lol but whats a code 16? And i guess i could leave the purge solenoid and the egr untill i swap in the 383. Was just trying to get some of this small stuff done before i do that. I still drive this car but only about 4 miles to work a couple times a week.
Old 12-31-2010, 12:19 AM
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Originally Posted by 95zguy
Call me stupid lol but whats a code 16? And i guess i could leave the purge solenoid and the egr untill i swap in the 383. Was just trying to get some of this small stuff done before i do that. I still drive this car but only about 4 miles to work a couple times a week.
I only mentioned the code 16 as a worst-case scenario. It's for the loss of the low resolution pulse for the optispark, so if you set any other codes you'd have no idea because the light is on for the EGR and EVAP. Get it?

My suggestion is just leave both of them until you have the tune. Deleting them without a tune has no immediate benefit at this juncture.
Old 12-31-2010, 12:34 AM
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Yeah i got ya. I was just wondering what a code 16 was, knew it musta been bad the way you said it lol. Hope i never see it. Believe it or not this cars got 112000 on it the motor was rebuilt 9000 ago and still no problems with the opti. Ill just wait. I appreciate all the info THANKS.



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