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 O2 sensor or MAP sensor?

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AA
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PostSubject: Re: O2 sensor or MAP sensor?   Tue Apr 22, 2008 4:29 pm

Make sure your buddy measured the fuel pressure during WOT. It should be in the 58+ PSI range. At idle it is much lower, which is normal.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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BoattailBob
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PostSubject: Re: O2 sensor or MAP sensor?   Tue Apr 22, 2008 5:11 pm

He just measured it at Idle and he was right in the middle of something so he didnt have time. So the measurement at idle is not a reliable reading? It would definately account for my loss of power and odd A/F mix. I suspected a vacuum leak but we tested for that and everything was fine. hmmmm
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urbsnspices
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PostSubject: Re: O2 sensor or MAP sensor?   Tue Apr 22, 2008 5:33 pm

Hey Bob, thanks for the '97 file. My PCM happily took the file.

Like AA said, check your fuel pressure at WOT. If you havent done your fuel filter, then it may be time.
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PostSubject: Re: O2 sensor or MAP sensor?   Tue Apr 22, 2008 8:35 pm

NP urbsnspices,
Hope you get yours dialed in with better luck than Im having so far.

I have to admit something... my rough idle, bad MPG, and poor performance really made itself evident last month when I ran out of gas.....there I admitted it. Felt like a damn fool.
Ive since done 2 techron treatments and changed the fuel filter, plugs and wires.
I'm just gonna go ahead and change the damn fuel pump. That way I can fix this annoying fuel gauge malfunction at the same time.
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PostSubject: Re: O2 sensor or MAP sensor?   Tue Apr 22, 2008 8:51 pm

O2s bounce all over the place. It's the way an O2 sensor works. You are seeing voltage spikes with each exhaust pulse that passes by. You really can't read O2 sensors other than to know it's working.
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PostSubject: Re: O2 sensor or MAP sensor?   Wed Apr 23, 2008 12:12 am

i picked up a fuel pump from advance auto for about $200. just make sure you go to the dealer and get a new lock ring, i think that set me back about $25. if you dont then you will probably leak gas once you fill up to check for leaks.
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AA
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PostSubject: Re: O2 sensor or MAP sensor?   Wed Apr 23, 2008 9:02 am

40 PSI seems pretty good at idle. I would suspect a bad/dirty injector before I replaced the fuel pump.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
BillBoost37
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PostSubject: Re: O2 sensor or MAP sensor?   Wed Apr 23, 2008 9:35 am

I agree 40 psi should do ok. IIRC FSM says something like 48-52 is the expected without motor running and clicking the key to get the highest pressure possible.
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PostSubject: Re: O2 sensor or MAP sensor?   Wed Apr 23, 2008 11:12 am

Ok, Ill give it till the weekend and see if the last bottle of injector cleaner does any good. He did a test to see if the injectors were holding pressure and they were but I guess that doesnt tell me if theyre clogged.

My crappy laptop I was using for scanning took a dump so now I have to buy one of those too frown

thanks for all the advice
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urbsnspices
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PostSubject: Re: O2 sensor or MAP sensor?   Thu Apr 24, 2008 11:32 am

BoattailBob wrote:
NP urbsnspices,
Hope you get yours dialed in with better luck than Im having so far.

I have to admit something... my rough idle, bad MPG, and poor performance .

No tuning yet, see my broken valve spring thread for details. headbutt

I hate to tell you to throw money at the car, but here are a few thoughts: PCV valve ($4.99) stuck open or closed it can effect idle. If you dont drive your car a lot, oil/water vapor sludge can gum them up. For 4 bucks, I would just change it if you never have.
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AA
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PostSubject: Re: O2 sensor or MAP sensor?   Thu Apr 24, 2008 11:36 am

Quote :

I hate to tell you to throw money at the car, but here are a few thoughts: PCV valve ($4.99) stuck open or closed it can effect idle. If you dont drive your car a lot, oil/water vapor sludge can gum them up. For 4 bucks, I would just change it if you never have.

Watch that spring when you open up the hatch. It tries hard to escape!

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
Back to top Go down
http://www.cardomain.com/ride/657082/4
BoattailBob
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PostSubject: Re: O2 sensor or MAP sensor?   Thu Apr 24, 2008 5:33 pm

I think I'll change my fuel filter again. The idle seems improved a little today so it maybe was some crud that hadnt made its way out when I ran out of gas. 5 bucks for a pcv valve wont kill me either....I'll watch the spring, thanks AA n urbs
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