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04-07-2008, 07:23 PM
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3800 Newbie
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Gregory Laing
Pontiac Grand Prix GT, 1998 Coupe
Location: Washington D.C.
Join Date: Feb 2008
Posts: 26
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O2 levels/Rough Idle
So heres the story,
I replaced ,the IAC, IAT, TPS, and Rear O2 sensor with an O2 Sim. My car pretty much threw codes for all of em. I guess they went bad?
Still have a bad idle/bad mileage. What the HELL is wrong with this car. I've been scanning with an Autotap. My 02 Levels dont seem right. The front reads, high 600ish-800ish. and the rear reads like 40ish- to maybe 100ish.
Any ideas anyone? Is the 02 Sim I bought from ZZP bad? Well, im about spent on this, someone shoot me some ideas. What are correct 02 levels?
Thanks,
Greg
__________________
(98 GT Coupe, Kenne Bell FWI, 12inGMPP Brakes, 160 Stat, Alt re-wire,DHPPcm, GMPP strut bar, Pwr Sluts,5%tint, 17in Bullets
Last edited by 98GTcoupe; 04-07-2008 at 11:04 PM.
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04-08-2008, 10:12 AM
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3800 Member
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nicholas keck
Location: lansing, michigan
Join Date: Feb 2008
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Maybe the front O2? Just a guess I have no idea....
__________________
2001 Grand Prix GT
12.950@104.66
M90 Blower on top of a L36 block, XP cam, TOG headers, ZZP Stage 2 I/C, WizAir, 2.5in exhaust,Hooker magnaflow mufflers
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04-08-2008, 06:49 PM
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3800 Newbie
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Gregory Laing
Pontiac Grand Prix GT, 1998 Coupe
Location: Washington D.C.
Join Date: Feb 2008
Posts: 26
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HAHA ok thanks!
Yeah im gonna scan the whore tomorrow. We will see whats up
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(98 GT Coupe, Kenne Bell FWI, 12inGMPP Brakes, 160 Stat, Alt re-wire,DHPPcm, GMPP strut bar, Pwr Sluts,5%tint, 17in Bullets
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04-09-2008, 07:35 PM
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3800 Newbie
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Gregory Laing
Pontiac Grand Prix GT, 1998 Coupe
Location: Washington D.C.
Join Date: Feb 2008
Posts: 26
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Ok well i scanned the car today. The Front bank 02 Sensor 1 is all over the place but i guess thats correct. I have a rear sim in for 02 Bank Sensor 2 so i guess its reading correctly. So i checked for Knock as well. At half Throttle, It read 10* of KNOCK! yikes. Then i checked the Idle Air Control Position, an its below 50 around 37-40ish Counts at idle. So i dont think thats good. Anyone make anything of this?
Any ideas? Running Lean?
HELP!!
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(98 GT Coupe, Kenne Bell FWI, 12inGMPP Brakes, 160 Stat, Alt re-wire,DHPPcm, GMPP strut bar, Pwr Sluts,5%tint, 17in Bullets
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04-11-2008, 09:22 AM
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3800 Newbie
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Gregory Laing
Pontiac Grand Prix GT, 1998 Coupe
Location: Washington D.C.
Join Date: Feb 2008
Posts: 26
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Any one have an IDea?
Hey can anyone reply to this? It seems the only people who get help are GTP owners or peeps who know each other. Just looking for some input, not tryin to bitch here.....
thanks
Greg
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(98 GT Coupe, Kenne Bell FWI, 12inGMPP Brakes, 160 Stat, Alt re-wire,DHPPcm, GMPP strut bar, Pwr Sluts,5%tint, 17in Bullets
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04-11-2008, 10:22 AM
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3800 Member
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nicholas keck
Location: lansing, michigan
Join Date: Feb 2008
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Wish I could help... Good luck
__________________
2001 Grand Prix GT
12.950@104.66
M90 Blower on top of a L36 block, XP cam, TOG headers, ZZP Stage 2 I/C, WizAir, 2.5in exhaust,Hooker magnaflow mufflers
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04-11-2008, 07:57 PM
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3800 Senior Member
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JOHN LEVERENZ
2003 monte carlo ss n/a
Location: IL
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greg i wish i could help ya also however i dont know
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03 monte carlo ss
1 K&N Gen. II Intake Kit (FIPK)
2 stage 1 68 mm throttle body/ with heat shield
3 ceramic coated slp headers
4 Borla exhaust
5a Intense stage 3na cam package
b Intense stage 3 heads 1.7 rockers on exhaust
c single roller timing set
d ported,polish lower intake / ZZP upper intake
6 Custom Intense Dyno Tune pcm
7 Intense poly motor mounts
8 Intense converter
9 Royal purple 10w-30 oil mobil oil filter
and more 
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04-13-2008, 05:54 PM
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3800 Newbie
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Gregory Laing
Pontiac Grand Prix GT, 1998 Coupe
Location: Washington D.C.
Join Date: Feb 2008
Posts: 26
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Whep thanks,
I'm startin to think its a vac leak. But here is something else i have noticed. I wish i knew how to post pics on here but im gonna post some up soon on my photo bucket site. So heres what i have noticed. the cars throttle body isnt completed flush up against the intake. theres like a 1/8thin gap on each side, kinda like the upper pleumen is warped. I just had the lower gaskets replaced an all that. so.... we will see.
also just went over all vac areas, still here a slight hiss. Not sure if it just the car or a vac leak. I need to get some die an try that. Anyone know where u can get die?
Thanks
Greg
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(98 GT Coupe, Kenne Bell FWI, 12inGMPP Brakes, 160 Stat, Alt re-wire,DHPPcm, GMPP strut bar, Pwr Sluts,5%tint, 17in Bullets
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04-13-2008, 06:58 PM
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Super Moderator
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Ross Calder
2000 GTP Coupe
Location: Halifax
Join Date: Oct 2004
Posts: 889
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2000Falcon holds the following arcade championships:
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Quote:
Originally Posted by 98GTcoupe
So heres the story,
I replaced ,the IAC, IAT, TPS, and Rear O2 sensor with an O2 Sim. My car pretty much threw codes for all of em. I guess they went bad?
Still have a bad idle/bad mileage. What the HELL is wrong with this car. I've been scanning with an Autotap. My 02 Levels dont seem right. The front reads, high 600ish-800ish. and the rear reads like 40ish- to maybe 100ish.
Any ideas anyone? Is the 02 Sim I bought from ZZP bad? Well, im about spent on this, someone shoot me some ideas. What are correct 02 levels?
Thanks,
Greg
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Greg, ignore the rear O2 values, they're only for throwing codes for emmissions purposes only.
So you have access to a scanner so you could post up a scan of what's going on? You say that your car threw codes for all of the above listed sensors?? At the same time? Do you have the codes now?
Well, with the codes it sounds like it might be something electrical if you got them all at the same time. However in general your idle and milage issue i'd have someone comb the car for a vacume leak.
Let us know any findings.
__________________
IS2 Cam/Custom Tune/1.6:1 Roller Rockers/130 LB springs/OR Pushrods/Forged CC 9.5:1 0.030" over Pistons/42.5 LB Injectors/160 Stat/3.4" MPS-non-intercooled/AL 103's/SLP CC headers & HF CAT w/2.5" custom Borla Exhaust/Functional SD hood w/cold airbox/FJO WBO2/HP Tuners/IR Coilovers/F-Fody brakes.
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