[s-cars] Drastic Power Loss-So far No Joy

[chris chambers]

This may be out in left field BUT...

I have heard of some "tuners" putting a ball bearing in the line
from the WGFV to the Waste gate. IF this is the case OR there is some
other obstruction in the line it can lead to overboost.


right?

HTH
Chris


--- Manuel Sanchez <manuelsanchez at starpower.net> wrote:

> S-heads,
> 
> Still hunting for whatever is causing my drastic cut off of power  
> near peak boost. This happens with my MRC RS2 software in my ECU as  
> well as with a bone stock ECU. So with my RS2 ECU I hit the wall at  
> about 26-27 psi, when the Stock ECU is installed (with the stock  
> injectors) I hit the wall at about 13-14 psi.
> 
> Many of you have suggested I'm experiencing an Over Boost situation  
> and have given me some avenues to pursue, here's what's been done
> today:
> 
> 1. My RS2 WGFV
> Checked with a multimeter, and it's within spec
> 
> 2. Other used, Stock OEM N75 WGFV
> Checked with multi-meter, within spec
> Installed in my car, test drive results in the drastic cut off in  
> power (nuts)
> 
> 3. Inspect Wastegate Diaphram
> No tears are apparent. Will test vacuum on this tomorrow hopefully.
> 
> 4. Turbo Outlet hose and Wastegate hose (that small diameter crinkled
>  
> and ultra expensive bugger).
> Swapped these hoses, as well as this other stock N75 WGFV into my  
> car, same boat anchor results
> 
> 
> Some people have suggested the altitude sensor, hopefully I can check
>  
> that soon.
> 
> What's puzzling, is that I think many of these electronic items would
>  
> throw a code if they were malfunctioning, no? Previously the only  
> codes I had been receiving were :
> 
> 00537 – Oxygen Sensor Control
> Maximum Control Level Exceeded
> 
> Condition:
> Fuel Tank Low resulting in fuel system pressure less than 3.3 bar (48
>  
> psi) [Note tank was ¾ full as indicated on fuel gauge]
> Ignition System Failure
> 
> Symptom:
> CO before 3 way catalytic converter less than 0.5% (Hmmm, what could 
> 
> this mean???)
> Fuel Consumption high
> 
> Repair:
> Fill Fuel Tank (tank had plenty of gas, and fuel gauge reads
> accurately)
> 
> 00537 – Oxygen Sensor Control
> Minimum Control Limit Exceeded
> 
> Condition:
> Engine Intake Air Leak after Mass Air Flow Sensor-G-70
> Leak in Exhaust System in front of 3 way catalytic converter
> Heated Oxygen Sensor (HO2S)-G39-malfunctioning
> Fuel System Pressure greater than 4 bar (58 psi) [This is  
> interesting, seems like I will throw this code all the time if I set 
> 
> the Fuel Pressure to 4 Bar/58 psi, which is what I believe I’ve been 
> 
> told is the Fuel Pressure for RS2’d cars. True?]
> 
> Symptom:
> Rich Exhaust
> Spark Plug Fouling
> CO before 3 way catalytic converter greater than 3%
> 
> Repair:
> Repair Leak
> Check HO2S-G39
> Check Fuel System Pressure
> 00561-Mixture Adjustment
> Adaptation Limit (mul) exceeded
> Condition:
> Fuel System Pressure too low
> Spark Plugs, ignition coil, ignition coil power output stage  
> malfunctioning
> Symptom:
> Reduced Fuel Economy (no kidding)
> Sooty Exhaust (yeah, in spades)
> Repair:
> Fill Fuel Tank
> Repair Leakage
> Check Fuel System
> Check Fuel System Pressure
> Check G70 (Mass Air Flow Sensor) [We cleaned the OEM MAF with MAF  
> Cleaner, and we also installed a brand new RS2 MAF-we still had the  
> drastic engine cut-off]
> 
> 
> Lately  we've been thinking that whatever the fault is, it's  
> something mechanical as opposed to electrical (that would throw a
> code).
> 
> 
> Some people have suggested  a few things that we haven't had time to 
> 
> try yet:
> 
> Altitude sensor
> 
> Check the wiring between the MAF and ECU with an ohmmeter
> 
> Throttle Position Sensor - the ECU allows boost only when the  
> throttle position sensor is above a certain value. So you could check
>  
> the sensor
> 
> Light on the fuel pump to see if it's getting cut off when the Cut in
>  
> Power occurs (I'm not exactly sure how to rig this up actually),
> 
> Hopefully I can check these soon.
> 
> 
> Any other ideas are greatly appreciated.
> 
> 
> Thanks.
> 
> -Manny
> 95 UrS6 (still kickin my arse)
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
> 


Make April 15th just another day http://www.fairtax.org



       
____________________________________________________________________________________
Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games.
http://sims.yahoo.com/