Thread: Retarding Ignition Timing (to improve emissions?)
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Old 08-03-2009, 09:32 PM
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Hit Man X Hit Man X is offline
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Quote:
Originally Posted by Cal Learner View Post
Cam was changed and air (smog) pump also added.


Yeah the air pump I know of (mine fell off mysteriously), figured they went to a diff cam profile that doesn't self EGR like the '89 and older did. Now I know.

Now I wonder if the '90+ have a hotter cam profile (somewhat) and just used the EGR to drop the NOx lower than the '89 and earlier.
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