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Discussion Starter · #1 ·
Hope someone can help....

Occasionally getting flashing CEL and reduced power on full throttle. I have a basic code reader and its telling me P1300 misfire. Freeze frame reports P1300, OL-Drive 96.5%

I believe the car is possibly over fuelling.

I took it to get it plugged into Tech2 , but without the light on the mechanic (who does really know his stuff) told me there would probably be no codes. I did check it again with my own code reader and it seems the codes have cleared.

I have already replaced the following - DI Cassette (genuine SAAB), Plugs (NGK PFR6H-10), Fuel Pressure Sensor, O2 sensor (front), Brake Servo Vacuum line, Crankcase breather hose, Rocker cover gasket, Oil pressure switch.

The car under normal load is driving well, however the idle could be described as a touch lumpy.

Next stage MAF and CPS?

Many thanks.

Alex.
 

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I'd be looking for vacuum leaks.

P1300 (from memory) is a random misfire. That would explain your flashing CEL (flashing means "catalyst damaging misfire" and it would also explain your lumpy idle.

Frank.
 

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Discussion Starter · #3 ·
Thanks for the reply. Changed the CPS and the idle is much smoother.
Still getting the flashing CEL at wide open throttle, but this time the code has changed to P1390.

Not sure where to go next. 99% sure there are no air leaks.

Thanks.
 

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Checks your plugs if they are sooted but commonly coming from bad coil cassette be aware it could damage catalyst.. Don't spend time for repairing that
 

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Discussion Starter · #5 ·
Just a bit of an update.....I replaced DIC, Plugs, Fuel Pressure Sensor, CPS, MAF, Front O2 sensor to no avail. I was starting to fear a plugged Cat.

Car just did its annual test and noted the HC idle was raised to 36ppm from 13ppm at the last test indicating a false air reading. CO was the same as the last test.

Decided to check the MAP (beside throttle body) and Air Intake Temperature Sensor (on intercooler pipe). Both have the same part number 55563262.

On removing the Air Intake Sensor the 'O' ring basically fell to bits. Cleaned both sensors and replaced O rings with the result misfire now gone and idle now very smooth. The faulty O ring must have been letting a little bit of air on full throttle.

Also noticed much cleaner gear changes and less kick down on a light throttle.

It seems that age and heat are not kind to these sensors and they are worth a manual inspection as no specific fault codes were detected.

Hope this is of some use.

Thanks.
 
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