 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Saab Cars / October 2004soot at exhaust - problem?
Hi All I have a recently purchased 9-3 S Convertible with the HOT engine. I noticed on my garage floor that there are particles of soot...blown out of the exhaust at starting the engine. The chrome exhaust tip is black now too...does it sound like I have a problem or is this to be expected. I am running on straight unleaded rather than premium unleaded fuel - will that be relevant? Thanks In advance for your help, DAN > ...on my garage floor that there are particles of soot...blown out > of the exhaust at starting the engine. The chrome exhaust tip is > black now too... A black sooty exhaust pipe is an indication for running a rich mixture or burning oil, in combination with smoke from the exhaust. What is the condition of the spark plugs? electrodes color? > does it sound like I have a problem yes, it is not as it should be. >or is this to be expected. no > I am running on straight unleaded rather than premium unleaded fuel - > will that be relevant? No, the engine management system should take care of all that. I would take the car to a (SAAB) garage and have the engine checked. -- MH '72 97 '77 96 '78 95 '79 96 '87 900T8 >A black sooty exhaust pipe is an indication for running a rich mixture or >burning oil, in combination with smoke from the exhaust. >What is the condition of the spark plugs? electrodes color? [snip] I think it's fairly normal for a modern car. For instance, My HOT 9-3 has a fairly sooty exhaust too. It passed it's first MOT yesterday. Lambda was dead on 1, so it certainly isn't running any richer it ought to. It doesn't lose any oil either. Cheers, Colin. Thanks for the - disparate - views guys. The car has been serviced by SAAB dealer less then 3 weeks ago, when I purchased it. The next service isn't due for a year so I assumed that they would have checked the tuning at the service? > Hi All > [quoted text clipped - 7 lines] > > Thanks In advance for your help, DAN >Thanks for the - disparate - views guys. Don't you just love usenet :o) >The car has been serviced by SAAB >dealer less then 3 weeks ago, when I purchased it. The next service isn't >due for a year so I assumed that they would have checked the tuning at the >service? They won't have. There is no check for mixture in the service schedule. They expect the closed-loop control system to keep it all nicely tweaked-up as you drive. For the system to not work and not be able to tell you that something is wrong, would require a pretty weird fault. The backup is any mandatory emissions tests you might be subject to in your area. Cheers, Colin. >I am running on straight unleaded rather than premium unleaded fuel - will >that be relevant? You're probably not saving any money and you are losing out on a lot of power aka fun. When you use lower octane gas the engine will detune from ideal settings while you drive - reducing mileage by more than you save per gallon. I can't see the point of owning a HOT motor if you are going to use regular. >>I am running on straight unleaded rather than premium unleaded fuel - will >>that be relevant? [quoted text clipped - 4 lines] >than you save per gallon. I can't see the point of owning a HOT >motor if you are going to use regular. I would suggest to look into the manual under the hading Fuel and read SAAB:s own recommendations. In the manual for my 2002 9-3 Sport Edition there are recommendations for the different engine options (in this case 150, 185 and 205 hp) /Bengt Interesting challenge there Bob...I'll fill up with premium next time and compare. Certainly the fuel usage is poor at the moment (mainly city driving) at 12-13 litre per 100klm. >>I am running on straight unleaded rather than premium unleaded fuel - will >>that be relevant? [quoted text clipped - 4 lines] > than you save per gallon. I can't see the point of owning a HOT > motor if you are going to use regular. >Interesting challenge there Bob...I'll fill up with premium next time and >compare. > >Certainly the fuel usage is poor at the moment (mainly city driving) at >12-13 litre per 100klm. Be aware that ambient temperature ha a significant effect on MPG. Make sure your tests are valid. You need to get you engine codes checked. There are ways to do it yourself but I am not familiar with yours. Bottom line is this, there are many "problems" fault codes that will not trip the "check engine light" My 9K was not its usual peppy self and when I checked the computer codes it showed a lean condition and "suggested " I check the O2 sensor. I never got a "check engine" light with that alarm. Looks like you are running a little rich. > Hi All > [quoted text clipped - 7 lines] > > Thanks In advance for your help, DAN >You need to get you engine codes checked. There are ways to do it yourself >but I am not familiar with yours. Bottom line is this, there are many [quoted text clipped - 3 lines] >"check engine" light with that alarm. Looks like you are running a little >rich. This isn't the case with the 9-3 though. I thought the same as you until I needed a new SID programming for the car. I'd just serviced the car so I asked them to read out the fault codes (since I'm used to this being on the service schedule). I was told that there would be no point as the car won't store any fault codes without also complaining to the driver. They checked anyway, and there were no stored faults. When I got home, I checked on WIS and, sure enough, there isn't an item on the service schedule for reading fault codes. As I said before, a slightly sooty exhaust seems to have been standard on all the cars I've owned with catalysts. It seems that the "lambda=1" mixture that's needed to keep the cat happy is, in fact, a bit rich compared to what was considered best on older cars. Cheers, Colin, Gee guys - you are so learned! Thanks everyone for the input. I feel like I belong to a club since I bought the Saab! > I feel like I belong to a club since I bought the Saab! Yes, you do, and you will be buying more of them soon. It's a sect, an addiction, you are hooked... -- MH '72 97 '77 96 '78 95 '79 96 '87 900T8 |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.