Petrol Diagnostics: Saab 9-5, 2001, 2.3T (185hp). Intermittent MIL illumination.

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Saab 9-5, 2001, 2.3T (185hp). Intermittent MIL illumination. Archived Message
Posted by Phil Huelin on October 18, 2006, 6:34 pm
Hi all,
This Saab is putting the check engine lamp on intermittently.
Fault codes:
P1312 - Ignition coil - Knock detection. cylinders 1+2
P1334 - Ignition coil - Knock detection. cylinders 3+4
Freeze Fame:
Fuel system 1 - Open Loop
Load (%) - 23.1
ECT (deg. C.) - 98
STFT % - 0.0
LTFT % - -3.1
MAP (kPa) - 47
RPM - 835
Road Speed - 0
As I understand it, this engine measures ionization current at spark plugs to determine cylinder recognition and to detect knock so I checked the plugs first. They were the wrong kind so I replaced with OE and hoped that would be the end of it. But light came on again a few days later with same codes.
The car has done 30,000 miles with one careful lady owner! There are no other symptoms and it starts and drives perfectly.
Any ideas/suggestions welcome. Many thanks...Phil Huelin.

Message Thread:

Saab 9-5, 2001, 2.3T (185hp). Intermittent MIL illumination. - Phil Huelin October 18, 2006, 6:34 pm
fixed - Phil Huelin December 15, 2006, 6:30 pm