[saxon123]

Hi All,

I have a problem that I just can't seem to fix and would be very grateful if any one has any ideas as to how to fix this. I have a Saab 9-5 Aero year 2000. When I start the car from cold it idles fine for about 20 seconds. After that the revs go up and down until it finally dies. When I try to keeps the revs up by pressing the accelerator slowly it still runs fairly rough. The turbo dial actually goes up then goes down even though the revs are increasing. If I press the accelerator hard it just dies when I release the pedal.

I have observed that the car is running rich with black sooted plugs and black smoke from exhaust. A P0300 random misfire code is recorded when I rev hard. If I unplug the Mass air flow meter cars idles ok.

I have searched through the forums and have tried the following.

Replaced Air Mass flow meter (did not fix issue)
Checked plugs, type and gap
Checked evap purge valve and pipes
Checked Turbo bypass valve
Checked\replace Turbo control valve
Petrol changed for new petrol
Checked all vacuum hoses for leaks and replaced all anyway
Checked for any leaks in intake manifold or any air leaks
Checked all vacuum pipe are connected in the right way
Checked all one way check valves are working
Ran through a diagnostic for the turbo. With certain pipe blocked achieve full boost

Plugged into OBD2 software no codes being recorded or no stored codes.

Not sure what else I can do to try to resolve this. PLEAE HELP!

 

[[email protected]]

Hi All,

I have a problem that I just can't seem to fix and would be very grateful if any one has any ideas as to how to fix this. I have a Saab 9-5 Aero year 2000. When I start the car from cold it idles fine for about 20 seconds. After that the revs go up and down until it finally dies. When I try to keeps the revs up by pressing the accelerator slowly it still runs fairly rough. The turbo dial actually goes up then goes down even though the revs are increasing. If I press the accelerator hard it just dies when I release the pedal.

I have observed that the car is running rich with black sooted plugs and black smoke from exhaust. A P0300 random misfire code is recorded when I rev hard. If I unplug the Mass air flow meter cars idles ok.

I have searched through the forums and have tried the following.

Replaced Air Mass flow meter (did not fix issue)
Checked plugs, type and gap
Checked evap purge valve and pipes
Checked Turbo bypass valve
Checked\replace Turbo control valve
Petrol changed for new petrol
Checked all vacuum hoses for leaks and replaced all anyway
Checked for any leaks in intake manifold or any air leaks
Checked all vacuum pipe are connected in the right way
Checked all one way check valves are working
Ran through a diagnostic for the turbo. With certain pipe blocked achieve full boost

Plugged into OBD2 software no codes being recorded or no stored codes.

Not sure what else I can do to try to resolve this. PLEAE HELP! [/b]

Did you get it tested with tech 2 ? Not many OBD 2 readers can diagnose thoroughly, and When did you change your di cassettes?

 

[saxon123]

HI Steve,

Thanks for your reply. The DI cassette was changed a month or two back actually and it was running fine with the replacement part. I got the feeling the P0300 misfire was a red herring as its running so rich that’s why its showing this code. With the Mass air flow meter disconnected I don't get that P0300 code. No I have been using Scanmaster OBD software. I am hesitant to take it to the main dealer as I have paid for Tech II diagnostics before for which have been a wast of time. I am trying to get the car working to just be able to sell it so don't want it going into the main dealers and have a bill for a long list of parts they have changed before they have fixed the problem. Car can't be worth much anymore.

 

[christ]

Any joy getting to the bottom of what was happening mate??