Misfire at cruising speed. - Saab 9-5 Bulletin Board - Saabnet.com
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Misfire at cruising speed.
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Posted by PGAero [Email] (#1143) [Profile/Gallery] (more from PGAero) on Fri, 22 Jun 2012 11:06:55 Share Post by Email
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Hey all!

I've done some searching and I've devised a plan but I want to get your input to make sure I'm not missing something.

My '04 Aero wagon (Automatic) hesitates at sustained partial throttle. My first thought was DIC, but I replaced it and saw no improvement in the behavior. The hesitation never happens at WOT and I haven't noticed it on trailing throttle. The car has hunted at idle on very rare occasions, but it surges most commonly at consistent speeds between 35-75 even while cruise control is on. The turbo gauge and tach both hop around a bit and there's a distinct surge/break in acceleration. (Jerk)

My plan of attack:
Check vacuum hoses for cracks or leaks (I might just replace them)
Check spark plugs (also might replace them)
Check MAF sensor (my brother has an '01 LPT, if I can, I'll switch them out to see if that changes)

If it is the MAF, has anyone ever used a non-OEM part? I'm just curious. I tend to go with OEM stuff for things like this.

Thanks in advance.

~Peter
'04 Aero SC, 81K miles.

posted by 72.47.88... 

_______________________________________
Current:
'03 9-5 Aero Wagon, 5spd, Polar/Black
Past:
'06 9-5 Combi, AT, Polar/Black
'04 9-5 Aero Wagon, AT, Nocturne/Granite
'03 9-5 Aero Wagon, AT, Steel/Charcoal
'00 9-3 Viggen, 5D, Silver/Black
'93 9000 Aero, 5MT, Cirrus/Black (Owned this one twice)
'86 900 SPG, 5MT, Edwardian/Buffalo Grey
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