Re: cold stumbles - Saab 900 Bulletin Board - Saabnet.com
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Re: cold stumbles
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Posted by kenS [Email] (#606) [Profile/Gallery] (more from kenS) on Wed, 22 Apr 2020 12:13:44 Share Post by Email
In Reply to: Re: cold misfire, Saabina [Profile/Gallery] , Wed, 22 Apr 2020 09:54:46
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I have a similar problem on my '87, when I went to slightly larger injectors (fomoco 24#) and a 2.8 bar FPR. The engine starts and idles fine, then starts to stumble until the temperature gets above 40deg C (I have a coolant temp gauge in the port adjacent to the NTC sensor). Once the O2 sensor starts cycling, and temp gets above 40 deg C, the stumble disappears and the car runs great. I'm guessing the problem is that the ecu fuel maps just can't compensate for the increased fueling until the O2 sensor starts to control things. I think the basic LH2.2 ecu can compensate for 10% or so increases in fueling with the O2 sensor--- if you go through the old Performance Archives you will find lots of discussion on this. It's not the fuel pump, not the temp sensor, not the AMM (looked at all of these over the years). I learned to live with it, it is a minor annoyance only for the first 3-4 min after startup.
The only real fix for this is to have a custom fuel chip designed to work with the injectors and FPR, like what Jack Stoll used to do.

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