1992 Nissan Skyline

Engine Performance problem
1992 Nissan Skyline 6 cyl Front Wheel Drive Manual 70000 miles

Dear engineer,

I have problem in my Nissan skyline 1992. When put the key before start the engine the light of hot exhaust never lighting. But after 10 minutes of start the engine, this light will be lighting & decrease in horse power of the engine & advanced ignition after 4000RPM in full throttle.
And there black smoke from the exhaust.
I'm scanned the engine in OBD2 device, and there are no problems in the engine depended on OBD2.

Your quick replay will be highly appreciated.
Many thanks & B. Regards
Ash schomi
August 12, 2009.

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