Re: severe mpg drop - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: severe mpg drop
Posted by Dean (more from Dean) on Sat, 21 Jul 2001 11:02:13
In Reply to: severe mpg drop, lan, Fri, 20 Jul 2001 23:18:31
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I think that your great highway mpg's indicate that the O2 sensor is working perfectly.
Check the plugs first. Study the deposits for cylinder to cylinder variations. If dark and you are running #7 heat range, go to #6. Use only the NGK plugs.
Fuel filter replace ever? Air cleaner good? City driving will create knocking conditons if your combustion chambers and/or injectors are dirty. Use Techron Conentrate to deal with that. Every 8000 miles, and two consecutive treatments if yo have not been using such a product before.
Hot weather will also cause the engine to detune.
Are you using high octane fuel? Lower octane fuel will cause more knock sensitivy and detuning. Higher octane fuels have more cleaners to deal with deposits that cause aquired octane demand in engines.
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