Thread: Retarding Ignition Timing (to improve emissions?)
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Old 08-02-2009, 08:48 AM
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Cal Learner Cal Learner is offline
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Quote:
Originally Posted by stevenstevensteven View Post
I'm a little unclear on replacing the vacuum hose. Is this just for EGR equipped vehicles, as my '89 M103 is NOT EGR equipped. If it applies to non-EGR vehicles, I'd appreciate it if someone can help me isolate this hose as I'm not certain which hose Duke is referring to here.

Also, do I need to check the timing BEFORE I retard it? What is the ignition timing spec on these cars?

Thanks again.
No, it's not just for EGR-equipped vehicles. The vac hose described in the post by Duke2.6 is pictured in the photo below. Leading edge of intake.
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Retarding Ignition Timing (to improve emissions?)-p5095541xs.jpg  
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