Emission question
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Senior User
Joined: Mar 2004
Posts: 173
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From: Southern Illinois
Emission question
On my 88 300, I am in the process of replacing my exhaust manifold gasket and have a few questions.
Is the air injection tube into the head necessary to prevent the engine from backfiring on the deceleration?And are there any reasons to keep it?
Can I just rig up some thing to keep the pcv air and oil vapor from going back into the engine? I don't want to glom up the intake manifold any more than it already is.
Any help would be appreciated.
Is the air injection tube into the head necessary to prevent the engine from backfiring on the deceleration?And are there any reasons to keep it?
Can I just rig up some thing to keep the pcv air and oil vapor from going back into the engine? I don't want to glom up the intake manifold any more than it already is.
Any help would be appreciated.
Elder User
Joined: Jul 2004
Posts: 911
Likes: 2
From: Northern Virginia, USA
Usually, tampering with emissions equiptment is forbidden by law. Do you have to pass emissions? If not, have fun.
1. Air injection is used to combust excess hydrocarbons during cold startup, before the cat is hot enough to run. Air injection occurs during open-loop mode, so removing it won't affect the air/fuel ratio the oxygen sensor sees. (pretty sure on this)
2. PCV value- this emissions device goes back a long way. Buildup inside your intake manifold is pretty much limited to a thin coating, and it prevents that thin coating of gunk from being sprayed all over your engine bay. Crank-case filters only help so much, they get saturated, look ugly, and have to be changed. I'm inclinded to leave this as-is.
Even lawnmowers have PCV setups. I once saw a 12HP lawn tractor with the crank-case vent removed. Left a thick oily vapor trail behind it. Rider was wearing a face mask, and the whole front of the thing was coated in gunk.
1. Air injection is used to combust excess hydrocarbons during cold startup, before the cat is hot enough to run. Air injection occurs during open-loop mode, so removing it won't affect the air/fuel ratio the oxygen sensor sees. (pretty sure on this)
2. PCV value- this emissions device goes back a long way. Buildup inside your intake manifold is pretty much limited to a thin coating, and it prevents that thin coating of gunk from being sprayed all over your engine bay. Crank-case filters only help so much, they get saturated, look ugly, and have to be changed. I'm inclinded to leave this as-is.
Even lawnmowers have PCV setups. I once saw a 12HP lawn tractor with the crank-case vent removed. Left a thick oily vapor trail behind it. Rider was wearing a face mask, and the whole front of the thing was coated in gunk.
