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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Mule man on June 01, 2009, 12:51:37 pm

Title: '85 Emissions
Post by: Mule man on June 01, 2009, 12:51:37 pm

I just bought an '85  K2500 with a 350 engine that has all of it's original emissions "clutter" still in use (except there is no catalyic converter).  I have a '79 that has everything removed and plugged off. Would engine function be hampered in any way if I removed the air pump and all associated vacuum lines and plugged the egr valve and just ran a vaccum line to the vaccum advance on the distributor?  It is a 24 year old truck in Arkansas where there are no smog police or checks.  Thanks

Title: Re: '85 Emissions
Post by: VileZambonie on June 01, 2009, 03:40:12 pm

My suggestion would be to take pix and label everything in case you ever decide you want to put it back to stock or sell it to someone who might. Otherwise get rid of it all and leave the vapor system in tact. Everything else is pretty straight forward and sounds like you know what you have to do.

Title: Re: '85 Emissions
Post by: Mule man on June 01, 2009, 09:03:55 pm

Thanks for the reply.  I had one guy tell me that if I removed the air pump and EGR that the carb would  run too lean.  I thought the air pump just recirculated the gasses for another burn to make a cleaner burn?  Thanks again.

Title: Re: '85 Emissions
Post by: CreativeNotice on June 04, 2009, 08:36:18 am

Are there any significant effects on mileage created by removing/keeping the emissions system? I've got the same yr model as Mule.

Title: Re: '85 Emissions
Post by: VileZambonie on June 04, 2009, 11:54:06 am

The AIR system injects air in the exhaust manifolds up stream and in the second bed of the cat down stream. It won't make it lean as it's post combustion. It will not decrease mileage.