Killer '01 SS

iTrader: (2)

Okay... I'm helping a friend tune his car, and I've managed to get his 230/240 .609/.609 112 cam to idle decently, and it runs like a raped ape. (Dyno'd at 409rwhp/378 rwtq on stock timing tables with headers & stage 1 heads.) But for the life of me, I can't figure out why it won't go into closed loop!

We drove the car around for 45 minutes, Autotapping it the whole time. LTFT's never moved off 0, no matter what we did with the throttle, so it's definitely staying in open loop. Both O2's are good. He has a 160-degree thermostat, so I tried lowering the "Closed Loop Enable Temp" in LS1_Edit. Still no closed loop. I tried raising that value... Still no closed loop.

The only other symptom the car showed was a P0102 low frequency MAF error, which we traced to a blown fuse (thanks to a 1:00 a.m. search on this board! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> ). Once we replaced that fuse, no more codes were thrown.

HELP!!!! What else can I change to get the car to go into closed loop??? <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

killer01ws6

what tuning do you have with that set up?
have you tryed relearning the pcm
1. Turn key to the "on" position but don't start car
2. Pull the PCM BAT and PCM IGN fuses in engine compartment
3. Wait approximately 5 minutes
4. Turn ignition off
5. Replace fuses
6. Start the car and then make sure the light has gone off

Just curious.
I do like your screen name <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Killer '01 SS

iTrader: (2)

Thanks... Yours too! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

The car has the following tuning changes, done by me:

- Stock fuel and timing tables (for the time being)
- EGR deleted, all EGR codes deleted
- Rear O2's deleted, all rear O2 codes deleted
- CAGS deleted
- COT protection deleted (longtubes, no cats)
- Speedometer adjusted for 3.70 gears
- Rev limiter raised to 7000 RPM
- Torque management deleted
- Misfire code detection deleted
- Idle raised to 1150 RPM across the board
- Lowered fan-on temps (car has a 160-degree thermostat)

The car still reaches 187 degrees at operating temperature... Anybody have any ideas on how to get the thing to go into closed loop? (I can create an "open loop only" PCM file for him, but I don't think that's what either of us wants to do... Seems like a temporary solution only.)

Any help is greatly appreciated.

Captain InsaneO

iTrader: (38)

TTT cause it's my car!!!!!!!!

Richard@WCCH

iTrader: (3)

After fixing the maf problem, is the maf reporting updated values to Autotap? If not, the maf may still be your problem. Also, are the front O2s reporting accurately? If the sensors are old, try replacing them. Also double check that you didn't accidentally disable the front O2s and ensure that you don't have a wiring problem. One non functioning O2 can keep the car in open loop.

Good luck,

Richard <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />