BOOST DUTY CYCLE AT 100% :?: - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-10-2003, 06:35 PM   #1
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Default BOOST DUTY CYCLE AT 100% :?:

i just installed a FLOZ supercharger this past weekend along with alot of other mods. now my car wont idle at all unless its warmed up then it still idles rough. it sets a code 44 for the O2 sensor lean. i checked the fuel pressure today and i have 45psi with the key on and 42 psi at idle( when i can get it to idle. the O2 volts with the key on is at 0.45 volts and running is at 0.00 volts. i brough our scanner at work home today too, we have a new OTC genisys scanner. as soon as i start the car, the boost duty cycle is at 100%( full boost) when i turn the car off and just the key on , it is a 0%
i double checked everything i can see without removing the supercharger and i see nothing that was left off or missing.
any ideas
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Old 02-10-2003, 08:14 PM   #2
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Jeffrey, mine also reads 100% boost at idle. What scantool are you using? Read my Ok I give up post in mech and maint.
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Old 02-10-2003, 08:19 PM   #3
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im using an OTC genisys scan tool.
plugs are bone white after over 80 miles on them, the O2 goes to 0.00 volts when its running, it is definitly running lean.
also, i need help posting a pic too
i tried the [img] thing and it didnt work
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Old 02-10-2003, 11:53 PM   #4
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Default Re: BOOST DUTY CYCLE AT 100% :?:

Quote:
Originally Posted by jeffrey10x2
i just installed a FLOZ supercharger this past weekend along with alot of other mods. now my car wont idle at all unless its warmed up then it still idles rough. it sets a code 44 for the O2 sensor lean. i checked the fuel pressure today and i have 45psi with the key on and 42 psi at idle( when i can get it to idle. the O2 volts with the key on is at 0.45 volts and running is at 0.00 volts. i brough our scanner at work home today too, we have a new OTC genisys scanner. as soon as i start the car, the boost duty cycle is at 100%( full boost) when i turn the car off and just the key on , it is a 0%
i double checked everything i can see without removing the supercharger and i see nothing that was left off or missing.
any ideas
As per our conversation on Yahoo! I've come to these conclusions!
First based upon the fact I can't FIND ANY SPECS on this "new" SC & TB setup, I believe that they're your whole problem lies there! A "Google" search on Fl Oz Sc'* came up blank!. Basically it'* like this.....Your stock fuel pump & pressure regulator can't supply enough fuel for the greater demand needed by the larger TB & SC! Therefore the O2 is setting a "lean" code & your plugs are getting "white" from the "too hot" combustion chamber setting produced by the "hotter" spark made by the MSD coils & wires! Both these "after-effects" back up my theory here! You are gonna have to get a "Adjustable" fuel presure regulator installed & maybe even a high volume Fuel pump to make this setup work better!http://www.pfyc.com/store/merchant.m...y_Code=GPUNDER Another possibility is to install a MAF Translator! http://www.pfyc.com/store/merchant.m...y_Code=GPUNDER Both these options may have to be done to get back the performance needed to run this set up!
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Old 02-10-2003, 11:58 PM   #5
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That'* right along the lines of the advice I gave him too. The TB is bigger than his stock one, and ported/polished. The SC is ported/polished. He'* using his original sensors. He IS running lean.

It all falls right into place, Al. Jeffrey, I had my doubts when you started this, if you remember. Doesn't mean you won't be pleased with the end result, but it'* gonna take some more work. You're taking a big one for the team here. We're all gonna learn from you, so keep the info coming. Somebody else (DrJay) just asked me about the Floz upgrade for a 93 2 nights ago. I told him to wait for your final report.

For now.....I think this would be ok on a 94/95, as it uses the 94/95 sc and tb, but maybe not such a good idea for the 92/93.....until we get yours back on the road.

Jeffrey, I have an idea. Try to restrict the intake and reduce the airflow. Before you do this, reset your PCM. After you restrict it, let it run for awhile. If this has a better outcome, we know what the problem is for sure. I'm not sure this will tell us anything, but if it changes, we'll know why. Make your restriction as far from the MAF sensor as possible. Maybe cover part of your cone filter.
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Old 02-11-2003, 06:52 AM   #6
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ok, i did a fuel volume test on my fuel pump yesterday and it was great. as a rule of thumb, while the car is running, hit the gas 3 times really quick and watch the fuel pressure, if it falls more than 5 psi from its original readings, then the pump cant keep up. mine never fell at all, when i hit the gas 3 times quick to the floor, my fuel pressure went to 47 psi every time. i talked to the guy a floz last night. he is sending me a new 6" K&N conical filter to replace my 11" one. also he is sending me a MAF screen and clip and also a new MAF sensor and next day shipping them to me today, so ill have them tomorrow.

i have my fingers crossed. he said he has had only one problem with the upgrade i di9d and that was with the maf screen.

ill post back when i know more.
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Old 02-11-2003, 09:17 AM   #7
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Quote:
Originally Posted by jeffrey10x2
ok, i did a fuel volume test on my fuel pump yesterday and it was great. as a rule of thumb, while the car is running, hit the gas 3 times really quick and watch the fuel pressure, if it falls more than 5 psi from its original readings, then the pump cant keep up. mine never fell at all, when i hit the gas 3 times quick to the floor, my fuel pressure went to 47 psi every time. i talked to the guy a floz last night. he is sending me a new 6" K&N conical filter to replace my 11" one. also he is sending me a MAF screen and clip and also a new MAF sensor and next day shipping them to me today, so ill have them tomorrow.

i have my fingers crossed. he said he has had only one problem with the upgrade i di9d and that was with the maf screen.

ill post back when i know more.
A 11" cone! That'* a bit overkill!
You never told me you removed that MAF screen? It'* a Digital MAF with a "Heated Grid" that year! That'* why my own MAF screen is still installed. there is two types of MAF'* generally used by GM on our cars: The "Heated Grid" Digital MAF & the "Hot Wire" MAF. The "Hot Wire" MAF can have it'* screen removed w/o any ill effect as the "Hot Wire" will still be there to register a signal. The other type of MAF NEEDS the Screen as there where the "heat" part goes through!
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Old 02-11-2003, 02:52 PM   #8
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I know his screen was gone when he bought the car originally, and he didn't have any problems. The increased flow may be causing a problem now, though. Rat, what years were the 2 MAF types used?
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Old 02-11-2003, 04:47 PM   #9
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Will, we may have inadvertantly stumbled on to the reason why some Bonnevilles can run without the MAF screen and others can't. I will be watching this closely as I have been torn between removing it and leaving it since first hearing about this mod back in August, 2002.
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Old 02-11-2003, 06:00 PM   #10
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got other parts coming from floz tomorrow, including a screen and clip , also a 6" k&n too
ill post to see what it does
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