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1985-1998 [Subscribe to Daily Digest] |
[Profile/Gallery]
, Fri, 19 Feb 2010 15:59:35
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dbreid,
I reviewed and condensed your "Shuddering" concern, AND added some thoughts afterwards.
--------------------------------------------------------------------------1993 Saab 9000 Aero 5-Speed with TCS, TRIONIC (without OBD II, M1993)
The Issue______________________
The car, at times, shudders.
This feels like the engine is "lugging".
It can happen at idle, or at any RPM range under load or not.
It has nothing to do with temperature.
Background on what I have tried______________________
-ISAT. there are no ETS or Trionic codes).
-DI. a new one and it did nothing.
-plugs. put in a new set of NGK's gapped to 0.95mm. No change.
-Fuel pump connections. cleaned and checked. Connectors are perfect.
-Vaccuum leaks. checked vaccuum lines, and replaced many. No difference.
-Crankshaft position sensor. CPS giving a great sine wave signal.
-Fuel Pump. Fuel Pressure good.
-O2 sensor. While driving, the O2 would go "Flat" when the car acted up. A new one didn't solve it.
-New MAP sensor. no difference.
-any change in voltage when this happens? no change. between 13.9 - 14.2
-bad ground. sand and re-tighten grounds (G7) on the intake manifold and the Trionic ECU
-ECU. unplugged Trionic ECU, inspected and exercised the pins. no difference.
--------------------------------------------------------------------------
Your TCS may be going into Limp Home Mode! Let's determine if the problem is AIR, FUEL, or IGNITION.
AIR:
a.) Air Filter installed backwards?
b.) Air passages clear?
c.) Intake tube connections secure and tight?
d.) At idle, disconnect MAP sensor vacuum line. If RPM remains unchanged, replace MAP sensor.
e.) Attach a vacuum gauge (readable from the driver's seat) to the intake manifold.
At idle, record vacuum readings and pointer variances under 1. normal, and 2."shudder".
FUEL:
a.) Sprinkle a fuel sample on concrete. Check for water droplets or contaminants.
b.) At idle, disconnect fuel pressure regulator vacuum line, If RPM remains unchanged, Replace regulator.
c.) Check the fuel filter for clogging.
IGNITION:
a.) Test Crank Position Sensor:
1. Pin 40 GN/RD 0-12VDC input
2. Pin 64 RD 12VDC output
b.) Test Throttle LOAD signal:
Use ISAT Command Codes (?)
1. 281 RUNNING LOAD idle display: 80066 ETS pins 27 + 1 pulse width 25
2. 281 RUNNING LOAD wide open display: 80224 ETS pins 27 + 1 pulse width 500
c.) Test ETS(376):
1. re-Calibrate ETS:
ETS CALIBRATION - MANUAL TRANSMISSION (using ISAT)
Connect ISAT to the black plug using the capacitor lead.
Start the engine.
Record and Erase any Fault Codes.
BASE-LINE SETTING. Enter command code 971
8A971 = Processing
8D971 = Completed.
Turn ignition key to OFF.
Turn ignition key to RUN, engine off.
CALIBRATION, WARM ENGINE. Enter command code: 973
8A973 = Processing
TCS CTRL illuminates.
START the engine.
Idle stabilizes.
RPM rises to 3000.
TCS light extinguishes.
Turn ignition key to OFF.
2. Test ETS main relay (377), under dash glovebox, position J.
3. Test ETS Throttle motor (378), on intake manifold.
4. Test ETS Pedal potentiometer (379), under left dash, above throttle pedal.
5. Clean Ground G8 under left dash speaker.
6. Clean Ground B24 under right front seat on crossbeam.
Happy Trails!
posted by 67.34.14...
, Fri, 19 Feb 2010 15:59:35, Thu, 25 Feb 2010 16:20:24, Tue, 23 Feb 2010 13:37:00, Mon, 22 Feb 2010 18:41:02, Tue, 23 Feb 2010 16:51:16, Tue, 23 Feb 2010 16:53:25, Tue, 23 Feb 2010 23:34:31, Sat, 20 Feb 2010 23:53:41
, Fri, 19 Feb 2010 21:51:56, Sat, 20 Feb 2010 23:51:26, Sun, 21 Feb 2010 01:34:55
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