LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Computer wont run tests...

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Old May 17, 2005 | 06:13 AM
  #1  
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Computer wont run tests...

started my engine up saturday.
357 with a mad z28 mail order tune. i had madz28 delete my air pump, air conditioner, and egr. i only have 40 miles on the car, but it hasn't run my catalysts test, or my egr tests. my dad's got a gm scanner i can check my emission codes and they aren't "not ready" the tests just haven't actually been ran yet.
i know the computer needs certain conditions to run the tests, but i've let it idle, accelerated, decelerated, and ran it on the highway. what could the problem be? need to take the car down to emissions and i need all these tests ran.
thanks
-Jason
Old May 17, 2005 | 06:21 AM
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Re: Computer wont run tests...

Run it some more. I've heard of cars taking up to 2 weeks to run the tests.
Old May 17, 2005 | 08:16 AM
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Re: Computer wont run tests...

oh ok cool. just wondering, wanted to know what i needed to do. my dad is freakin out and was gong to make me go buy a thermostat cuz my "160 won't let the car get hot enough"
Old May 17, 2005 | 08:42 AM
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Re: Computer wont run tests...

i was also wondering, if i had my egr deleted on my computer, will it still run the egr tests? i need the car to run all the tests to pass emissions.
Old May 17, 2005 | 10:06 AM
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Re: Computer wont run tests...

The car will not pass the scan test if those emission devices were deleted. You need to have the actual parts on the car (except for rear o2s - you can use sims) and the tests enabled to pass. You are allowed 2 fails however, so you can do this:

Send the computer back to enable all codes besides EGR or AIR (if you want to take advantage of the 2 fails allowed). I doubt you have a problem with your carbon canister purge system which you asked to disable. You can run o2 sims for the rear o2s and you should pass that way.
Old May 17, 2005 | 10:22 AM
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Re: Computer wont run tests...

Originally Posted by madwolf
The car will not pass the scan test if those emission devices were deleted. You need to have the actual parts on the car (except for rear o2s - you can use sims) and the tests enabled to pass. You are allowed 2 fails however, so you can do this:

Send the computer back to enable all codes besides EGR or AIR (if you want to take advantage of the 2 fails allowed). I doubt you have a problem with your carbon canister purge system which you asked to disable. You can run o2 sims for the rear o2s and you should pass that way.
madwolf, do u have my tune on file? i do have o2 simulators, so should be good on that. i think here in missouri, u can have 2 "not ready" codes and still pass. i only have about 45 miles on the engine.

as of right now, out of the 5 or 6 codes it needs to run for emissions, only 2 have actually been tested, and both are "ready" or passed.

my question is, will the other 3 tests, egr etc.,
either not test--OR-- test and fail?
if they run and fail its fine as long as only 2 fail..but i'm under the impression that if 1 doesn't test at all, it won't pass.
Old May 17, 2005 | 10:35 AM
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Re: Computer wont run tests...

Yes, I have your tune on file.
I'm sure we can make it pass as long as you send me the list of the codes it actually fails and also let me know if you still have EGR or AIR on the car, but either way, you should be getting two fails right now for the cats, one for EGR, one for AIR and possibly one for Carbon Canister. We can fix the two for cats and the one for CCP, so you will be left with two and you should pass without any problems. Others have passed the same way before.
Old May 17, 2005 | 10:43 AM
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Re: Computer wont run tests...

thats the thing i need to know.
i'm not failing those codes, because the tests haven't been ran yet. i need to know if the computer will still eventually run the tests. after you clear codes it takes a certain number of miles or key cycles before it will run tests again. if they test, then fail, i'll have to have it fixed. but will all of the codes including air/egr test?

I just don't want to drive the car around for another week, and find out the test won't even run. pass or fail doesn't matter, not even run.
Old May 17, 2005 | 10:53 AM
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Re: Computer wont run tests...

The fact that you're driving it right now, won't change anything for those that have been disabled. They need to be re-enabled in the PCM through reprogramming. Like I already said though, I know a few people who passed with the two codes disabled so yours should pass too.
Old May 17, 2005 | 10:59 AM
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Re: Computer wont run tests...

alright, thanks for the help..maybe i'll take it down there tomorrow afternoon and see if it passes. ses light is not on . but only 2 out of the 5/6 codes have been ran so far, and both have passed. but 4 are still unran.

just so ya know, the car runs good, the tune u gave me has been working out well..it is holding a nice idle. thanks
-Jason
Old May 18, 2005 | 06:17 AM
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Re: Computer wont run tests...

put the scanner back on last night, this is what i got.

test completed
catalysts NO
O2 sensor? YES
air YES
HO2S ?? NO
egr NO

my dad said the other tests might not be running cuz the car isn't getting up to operating temberature. have a 160 stat..going to put a stock 190 or whatever in it today and see it it will run the other tests. found out if i DO take the car for emissions, and it fail the first time, i can't pass unless i show paid reciepts that shows i tried to fix it, totalling a minimum of 450$ !!
Old May 18, 2005 | 08:32 AM
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Re: Computer wont run tests...

The guy who programmed your PCM is telling you:
The car will not pass the scan test if those emission devices were deleted.
Just because you have a 160deg t'stat doesn't mean the coolant is running at 160deg. What temp is it running at? Anything over 140degF is enough to put it into closed loop.

Generally on the emissions failure (not sure how MO compares to other states), ONLY IF IT FAILS MULTIPLE TIMES are you required to demonstrate that you spent the $450 TRYING to fix it, and couldn't fix it. They give you a provisional sticker. I can't believe they would require you to spend $450 to fix it, no matter what it failed for. If you had a bad $3 spark plug, it wouldn't make any sense to require $450 worth of work. I think you have the requirements confused.
Old May 18, 2005 | 08:52 AM
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Re: Computer wont run tests...

well i still havn't gotton the main question answered..
will the tests RUN ? -not will they pass- will they RUN ?
if they run and fail it will throw an ses code right?
or an i wrong about that.

IF: they will throw an ses code if they fail, they haven't even ran yet cuz my light isn't on.

sorry for being a pain, but for some reason i'm not 100% understanding this. just don't wanna get [edit] on my emissions...just wanna get a pass sticker

if i would send my computer back to get retuned to pass emissions, i'm guessing i would have to put the egr and air pump back on? [edit] !!

Last edited by Injuneer; May 18, 2005 at 09:02 AM.
Old May 18, 2005 | 09:01 AM
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Re: Computer wont run tests...

Let me start by telling you (moderator hat on) that you shouldn't override the language filter. PLEASE don't do that again.

The scanner is doing a "system readiness" test. It won't find the systems "ready" because they aren't turned on in the PCM. When you turn the systems on, you will get an SES light, unless he can set the system activation parameters outside the limits the engine will see during the emissions test.

I'll let "madwolf" correct any errors I made in the above.... but I think that's the message you aren't understanding. When you delete systems that have no negative affect on the performance of your engine, this is the trouble you get into.
Old May 18, 2005 | 09:44 AM
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Re: Computer wont run tests...

well i guess only thing i can do is take her and get it tested. . i'll let ya know madwolf if i need some "fine tweeking"
thanks for the help
-Jason

oh sorry bout that, didn't even know there was a language filter on the site, was making my own filter.



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