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Old 01-11-2013, 11:26 PM   #1
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Terrible Mileage

Hey everyone,
I've got a 97 9000 aero so no air mass meter or MAF sensor.
Lately mileage has gone in the shitter. Wasn't great before as it never really ran incredible at my altitude (8000 to 8500 feet). So far I have replaced the coolant temp sensor, the map sensor, and the fuel pressure regulator most recently. The o2 sensors are a year old. I dont know where to go next besides testing the leading o2 sensor and seeing what it does. Could really use some input here as I am on the verge of not driving it anymore till I figure this out. Thanks.
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Old 01-12-2013, 04:00 AM   #2
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Does it idle/un/boost right? Do the plugs look ok?

Tech 2 raise anything?

Driving it far enough to get fully warmed up?
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Old 01-12-2013, 04:15 AM   #3
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Idles poorly but not like terrible. It runs super rich because of the altitude so the plugs are black. Boosts fine. Haven't had it near a tech 2 in a while. Have to drive at least 100 miles or so to get it to one. It has been running rich like this for the entire time I've had it here and the mileage has never been incredible, probly like low 20s but now its like 13. I never figured out what the problem is with the altitude. If I did have a tech 2 it would help a lot because then I could read the o2 sensor and see what its doing. The closest tech 2 is below 5000 feet and the car seems to run okay there.
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Old 01-12-2013, 11:07 AM   #4
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High in the Alps I've had issues long ago with fuel tank pressure, might be worth your while checking that the fuel tank cap is ok, swap with another one? Also the charcoal evap canister might act up at altitude.

John Williams , think he trades as JZW tuning, is the man you need to talk to, he runs v fast Saabs in Colorado, often seen on TSN also think he is on here. Knows a vast amount about T5 Saabs.
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Old 01-13-2013, 03:20 PM   #5
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High in the Alps I've had issues long ago with fuel tank pressure, might be worth your while checking that the fuel tank cap is ok, swap with another one? Also the charcoal evap canister might act up at altitude.

John Williams , think he trades as JZW tuning, is the man you need to talk to, he runs v fast Saabs in Colorado, often seen on TSN also think he is on here. Knows a vast amount about T5 Saabs.
Yea I've spoken with him, he says what everyone else does. The best way to find out is to hook it up to a tech 2 at altitude or while its having the problem so it will throw out some codes. I'm trying to get a hold of JK who lives in Southern california (about 5 hours south) and has a tech 2. The town Live in is the main ski vacation destination for the southern california area. Thanks for that info it sounds like that may be the problem because I always here the fuel pump wine while the car idles up here and I dont when its below 5000 feet. I was thinking maybe it was the check valve in the fuel pump originally but your assumption sounds more probable.
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