Does the car have a cat?
93 Aero, Smoking Exhaust
I’m finally back to working on the ’93 Aero “TCS Delete” project.
Reprogrammed ECU to remove TCS feature; swapped in throttle body with TPS and AIC valve from a ’91 9000T. I still need to run wiring harnesses for TPS/AIC and also fabricate an extension for the throttle cable… but I was able to start it late yesterday just to see how it ran.
After a few minutes for the lifters to quiet down, the engine sounds great. Throttle response seems decent. However, there is quite a bit of smoke coming out of the exhaust… it’s mostly white… only very-slightly blue. When revving up the engine, I see a little puff of smoke come up from the turbo. The smoke hangs around for a while, does NOT smell sweet; smells more like fuel than oil. The oil is black and looks normal, no indication of the foamy brownish oil that I normally associate (on non-Saabs) with a bad head gasket.
The car has about 140k miles. Unfortunately, I couldn’t get much history from PO. The car does have upgrades… so it might have been driven hard in its past.
I’ve never had this type of problem with a 9000 (and I’ve owned lots of them in the past 18 years… I guess I’ve just been lucky). I googled, searched a few forums, and *tried* searching Saabnet, but I haven’t found much information… so I thought I would ask here.
Anybody have any suggestions on how to track the source of the smoking? Are there are other “usual suspects” beyond the head gasket and turbo?
Thanks in advance for any pointers!
Markus
Reprogrammed ECU to remove TCS feature; swapped in throttle body with TPS and AIC valve from a ’91 9000T. I still need to run wiring harnesses for TPS/AIC and also fabricate an extension for the throttle cable… but I was able to start it late yesterday just to see how it ran.
After a few minutes for the lifters to quiet down, the engine sounds great. Throttle response seems decent. However, there is quite a bit of smoke coming out of the exhaust… it’s mostly white… only very-slightly blue. When revving up the engine, I see a little puff of smoke come up from the turbo. The smoke hangs around for a while, does NOT smell sweet; smells more like fuel than oil. The oil is black and looks normal, no indication of the foamy brownish oil that I normally associate (on non-Saabs) with a bad head gasket.
The car has about 140k miles. Unfortunately, I couldn’t get much history from PO. The car does have upgrades… so it might have been driven hard in its past.
I’ve never had this type of problem with a 9000 (and I’ve owned lots of them in the past 18 years… I guess I’ve just been lucky). I googled, searched a few forums, and *tried* searching Saabnet, but I haven’t found much information… so I thought I would ask here.
Anybody have any suggestions on how to track the source of the smoking? Are there are other “usual suspects” beyond the head gasket and turbo?
Thanks in advance for any pointers!
Markus
1 - 4 of 4 Posts
YessirDoes the car have a cat?
As far as I know, Black smoke is burning oil. Blue smoke is usually rebuilt transmission fluid due to a leaking modulator valve in the older auto transmission. White smoke is due to water getting in to a cylinder from a bad gasket, cracked block or a cracked head. White smoke or semi white can be produced in several ways. One way is oil this is normally a whitish blue to blue smoke and has the apparent smell of oil being burned.I'm finally back to working on the '93 Aero "TCS Delete" project.
Reprogrammed ECU to remove TCS feature; swapped in throttle body with TPS and AIC valve from a '91 9000T. I still need to run wiring harnesses for TPS/AIC and also fabricate an extension for the throttle cable… but I was able to start it late yesterday just to see how it ran.
After a few minutes for the lifters to quiet down, the engine sounds great. Throttle response seems decent. However, there is quite a bit of smoke coming out of the exhaust… it's mostly white… only very-slightly blue......
Markus
Hope the info I collected for you helps but research on other materials as well.
1 - 4 of 4 Posts
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