Re: ok, let's roll - Saab 900 Bulletin Board - Saabnet.com
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Re: ok, let's roll
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Posted by Siegfried (more from Siegfried) on Thu, 2 Oct 2014 09:46:30 Share Post by Email
In Reply to: Re: ok, let's roll, ChrisMiami [Profile/Gallery] , Thu, 2 Oct 2014 08:14:00
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Chris,
ok, I read it as following:
- the ECU is trying to set operating point based on some pre-determined values stored in RAM/EEPROM and fails
- it's trying to compensate operating point runaway and fails
- it finally twists the knobs all the way clockwise, but it appears to be way too much and it thinks OMG-OMG-OMG!!!11one and starts turning the compensating knobs back anti-clockwise
- and it fails, RPMs are still too high! it cuts the compensating knobs all the way down to the negative limit permitted...
- ... and now the engine finally drops its RPM, but too much. ECU thinks gammit!!!!!!!!!111111111oneoneoneoneoneone
- goto #1

This sounds like sticky IAC or weak IAC current or fooled EFI ECU to me.

As for drivability issue, I read it as fuel enrichment not happening upon abrupt throttle open which means either TPS faulty (or bad signal ground, or TPS wiring issue), or FPR faulty, or fuel pump/injectors faulty, or EFI ECU faulty.

Zig

posted by 5.18.176...

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