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Slow when hot solved
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Posted by Sam (more from Sam) on Mon, 26 Jun 2017 20:04:21 Share Post by Email
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Hello,

I have been experiencing the slow when hot issue with my recently purchased 2008 9-5. Drove nice and pulled hard, instead acceleration when cold but when hot just turned into a dog as though it started in 3rd gear.
Read all the posts, considered fuel pump and DI but pump works when cold and DI too, also recent changed as date code was SEM 2015. I cleaned MAF, replaced horrible vacuum with silicone, and new plugs. No change. Sprayed the throttle body and verified no limp home.
Later my trusty Saab guy JP Foreign Car in FL noticed a transmission vent hose was pluged into the dummy nipple of the brake booster. The tranny was getting hot, and has a computer that tapers things back when hot. Also after the hose was pulled from the brake booster then the trans almost acted worse.
I did two draines, thank got better but it would still go into even more severe limp mode. Triggering code 0717, the input tranny sensor. It was exposed to extreme heat and I suppose degraded or became marginal when heated up. I replaced with a used, as these normally don't fail, OMG, like a new car. Also the tranny fluid was baked and looked like coffee. I will do my third drain, but things are better and I drive hour to work and back on highway and city with no lights, limp or lazy throttle. It just goes as I dreamed it would. I was going to change the FPR CPS, etc. but it was not the case. These transmissions are made well and have lots of electronics to protect it. Even the manual says it will taper things back if hot. I guess fried fluid from no venting and changing the input sensor that was marginal from the heat worked. So far so good

posted by 97.106.202...

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