Corrosion doesn't happen at 1.5K RPM - Saab 900 Bulletin Board - Saabnet.com
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Corrosion doesn't happen at 1.5K RPM
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Posted by Siegfried (more from Siegfried) on Wed, 9 Jul 2008 13:41:12 Share Post by Email
In Reply to: Was ECU. Car back running fine again. What ones work?, RayF, Wed, 9 Jul 2008 10:56:31
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It either happens within the whole RPM range or doesn't happen at all.

From Russian to English - I mean it's not cause of corrosion of ground point(s). I donna say you don't have corrosion their at all but it's not the root.

Btw here goes another story in brief - this time it happened with Valkyrie about two months ago. I was hitting a road on my way back home when I noticed that idle RPM jumped to almost 2K! AIC? Nope. Throttle? No. CE light? Missed. Car was running fine - nice acceleration (in terms of low pressure turbo), no smoke on speeding up or down - only high and STABLE idling.

Know what? I just 'reset' its brains - I stopped the engine and started it again. Stable 850 RPM. Now I think that smth went wrong with some counters/triggers/exception handlers/whatever those brits put inside my Lucas CU14 ECU. CPU just went to 'turbo x2' mode and set the desired level of idle RPM to 850x2=1700 RPM. I bet the RPM limit was set to 6000x2=12000 RPM as well but I didn't check.

And here goes another thought - you might probably know that heat kills chips. Overclockers - they always start with cooling mod and only after that they go on with revving up their CPU/GPU/Mem and such. You might probably need to check your fuel ECU whether it's getting hot or not. And if it ever had got hot for a long time (e.g. cause of paint-job and such).

So currently I suspect fuel ECU to be 'worn out', RPM sensor or its wiring or finally missing Tq signal (but this should turn on CE light although I'm not 100% sure) that fuel ECU sends to ignition (EZK) ecu.

Zig

posted by 85.140.10...

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