Date: 19 Aug 1997 20:21:34 -0400
From: kenbellnopsamx.com (Ken Bell)
Subject: Re: Help - '86 Saab 9000T Start Problem


In article <872014731.17710nopsamnews.com>, <beallcnopsammil> wrote: >I have a 1986 9000T with a cold start problem. I have read all the FAQ's >I can find, but none seem to address the same thing: > >The first time I turn the ignition switch in the morning, the car starts >and dies, immediately. > >The next two times it does the same thing, but takes a bit longer to die >each time. > >The next two times it idles until the climate control system starts to >come alive, about 3-4 seconds after turning the switch, then it dies. > >The sixth time I turn the ignition switch, I finally get the "classic" >cold start problem -- wild rpm oscillations, as it seems that the computer >hunts for, and eventually finds, it's correct "mark". It has always done >this hunting, and I would be happy if it would only do it, again. > >After this, the car is fine until the next morning, no matter how many >times it needs to be started. It seems (to this untrained, naive >layperson) like the computer loses its memory overnight, and has to >relearn everything, each morning. > >The dashpot was just replaced, and the 90k service was done (except for >the O2 sensor). I ran two tankfuls of Techron, graciously provided by our >mechanic, through the engine, to clean the valves. > >Does anyone have a similar experience,and hopefully a solution? (What follows is based on knowledge of the '88 9000T, but I'm assuming that the '86 is virtually identical. Sorry, my manuals are at home and I'm not.) I am glad to say I don't have this problem, but a wild guess is that perhaps by now your charcoal (evaporative emissions) canister hose is cracked, disconnected, or the purge valve is broken or leaking. There is a hose that runs from the throttle body (one of the upper vacuum nipples) all the way to the front of the wheel well on the passenger (right) side of the car. You have to remove the wheel arch liner to be able to see the canister. Instead of breaking your back to trace this, try removing that vacuum hose from the top of the throttle body and cap the nipple with a rubber vacuum cap. See if that helps. Of course, other possible sources of vacuum leaks are also worthy of consideration, and could cause this type of hard starting. BTW, did you or your technician do the usual throttle body wash and wipe? Pull the big hose, and the little ones (mark them for reconnection), spray carb cleaner and wipe carfully so as to not bend the fragile butterfly valve parts, with a soft rag. Pay some attention to spritzing into the small vacuum ports too, and the butterfly. And, of course all of the '86 vintage vacuum hose has already been replaced, right? Good luck and please post back what you find. -- Ken Bell :: kenbellnopsamx.com :: (212) 475-4976 (voice) ======== :: syklbnopsam.nasa.gov :: (212) 678-5516 (voice), 678-5552 (fax)

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