lt1 air pump
Thread Starter
Heel & Toe
Joined: Jun 2007
Posts: 17
Likes: 0
From: ward arkansas
lt1 air pump
ok here it goes... I have a 1996 vette lt1 auto is their any way to remove the electric air/smog pump on driver front corner? if so what all do i need to do it? any information would be appreciated.
Burning Brakes
Joined: Oct 2006
Posts: 834
Likes: 0
sure.. the only question is why? if you unbolt the pump remove the piping and plug the inlet to the exh manifld. to prevent a check engine light from comming on you need to install a resisor (I cant remember the ohms) in the connector to simulate the load of the motor. this way the computer dosn't think the pump has been removed or has a fault.
Racer
Joined: Feb 2007
Posts: 273
Likes: 0
From: Giurgiu
but how does this not screw around with the A/F ration, the O2 sensors are also in the exhaust ???
Melting Slicks
Joined: Dec 1999
Posts: 2,816
Likes: 2
From: Austin, TX
The air pump only runs during warmup when the system is in open-loop (not using O2's), so there's no impact on A/F ratios.
Instead of using a resistor on the wiring harness, I reprogrammed the computer to eliminate the AIR pump test. This may cause problems with emmission testing though (if you need to worry about that) since you're disabling an OBD2 test. The resistor actually sounds like a good solution, though, if anyone knows how to do it.
Instead of using a resistor on the wiring harness, I reprogrammed the computer to eliminate the AIR pump test. This may cause problems with emmission testing though (if you need to worry about that) since you're disabling an OBD2 test. The resistor actually sounds like a good solution, though, if anyone knows how to do it.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Instructor
Joined: Jun 2000
Posts: 171
Likes: 1
From: Chicago
Reviving an old thread for my 1995? Is there an answer to the mentioned resistor in this. Seems easier than buying software. Want to clean up the engine compartment.
Though another thread I found said on a 1995, simply remove, cap the manifolds and no code will be set unlike on a 1996.
Any thoughts?
Though another thread I found said on a 1995, simply remove, cap the manifolds and no code will be set unlike on a 1996.
Any thoughts?
Last edited by C4GUY; Jun 29, 2011 at 04:37 PM.
Tech Contributor
Joined: Jun 2004
Posts: 20,827
Likes: 959
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Reviving an old thread for my 1995? Is there an answer to the mentioned resistor in this. Seems easier than buying software. Want to clean up the engine compartment.
Though another thread I found said on a 1995, simply remove, cap the manifolds and no code will be set unlike on a 1996.
Any thoughts?
Though another thread I found said on a 1995, simply remove, cap the manifolds and no code will be set unlike on a 1996.
Any thoughts?
Just my speculation.
Instructor
Joined: Jun 2000
Posts: 171
Likes: 1
From: Chicago
I am thinking the resistor would not work in that it would always be applying resistance. At some point the airpump shuts off shortly after start up and the computer is no longer looking for the resistance. The PCM at some point must go, OK, engine hot enough, O2 sensors heated up, turn off smog pump. If the ressitor was there it would almost act like it was always on.
At least I think so???
At least I think so???
Tech Contributor
Joined: Jun 2004
Posts: 20,827
Likes: 959
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
I am thinking the resistor would not work in that it would always be applying resistance. At some point the airpump shuts off shortly after start up and the computer is no longer looking for the resistance. Do you know that for a fact? The PCM at some point must go, OK, engine hot enough, O2 sensors heated up, turn off smog pump. If the ressitor was there it would almost act like it was always on.
At least I think so???
At least I think so???
Burning Brakes
Joined: Nov 2006
Posts: 1,102
Likes: 1
From: Portsmouth Virginia 396LT4 435RWHP/400RWTQ Best so far 11.26 @ 123mph
On the 95,you can remove all the air pump/EGR piping and hoses and blank the manifold with no problem , but you do need to leave the EGR solenoid on the drivers side back of the manifold plugged in electrically in order for no code to be set. I did shut my air pump off with my software though because I decided to leave the pump in place and didn't want to hear it cycle. If you do decided to remove it without deprogramming it ,just tape the hot wire to the pump up good and out of the way. My 95 has been blanked off this way for 8 years now. No problems.
Rick
Rick
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
On the 95,you can remove all the air pump/EGR piping and hoses and blank the manifold with no problem , but you do need to leave the EGR solenoid on the drivers side back of the manifold plugged in electrically in order for no code to be set. I did shut my air pump off with my software though because I decided to leave the pump in place and didn't want to hear it cycle. If you do decided to remove it without deprogramming it ,just tape the hot wire to the pump up good and out of the way. My 95 has been blanked off this way for 8 years now. No problems.
Rick
Rick
Burning Brakes
Joined: Nov 2006
Posts: 1,102
Likes: 1
From: Portsmouth Virginia 396LT4 435RWHP/400RWTQ Best so far 11.26 @ 123mph
The 93 is different. Only the 94/95 can be done this way. The 95 being the last year of OBD1 makes many mods,removals, and tuning a little easier before the true OBD2 came in 96. Also things like removal of the rear O2 sensor for 94/95 without codes being set is nice unlike the 96 with the addition of a crank sensor and the requirement for 4 O2 sensors unless you use simulators for the rear sensors.
Rick
Rick
Instructor
Joined: Jun 2000
Posts: 171
Likes: 1
From: Chicago
While you're thinking, let me ask you a couple questions. Once the PCM turns the pump motor off, do you think the motor winding resistance just magically disappears? Second question: How do you think the PCM knows whether or not the pump is hooked up (or fell off after that last big pothole)?
My intent was to say I am not sure how it works, help me understand, no need to get feisty.
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
The 93 is different. Only the 94/95 can be done this way. The 95 being the last year of OBD1 makes many mods,removals, and tuning a little easier before the true OBD2 came in 96. Also things like removal of the rear O2 sensor for 94/95 without codes being set is nice unlike the 96 with the addition of a crank sensor and the requirement for 4 O2 sensors unless you use simulators for the rear sensors.
Rick
Rick
Tech Contributor
Joined: Jun 2004
Posts: 20,827
Likes: 959
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
I assume we're both Corvette enthusiasts here.
Instructor
Joined: Jun 2000
Posts: 171
Likes: 1
From: Chicago
Got it, well in that case, it appears at least on a 94 and 95 there is nothing triggered by simply unplugging it. But to continue my education then based on what you say and it does makes sense.
I would think (I am not certain) the ECM probably is looking for a load there, by measuring the current across a resistor (the pump iteslf if hooked up or a plug in resistor per your suggestion). So if that's the case, pump turned on or off then the resistance in the motor itself tells the ECM its there??
Of course this thread just confuses whether you can simply unplug it and move on
http://forums.corvetteforum.com/c4-t...-deletion.html
I would think (I am not certain) the ECM probably is looking for a load there, by measuring the current across a resistor (the pump iteslf if hooked up or a plug in resistor per your suggestion). So if that's the case, pump turned on or off then the resistance in the motor itself tells the ECM its there??
Of course this thread just confuses whether you can simply unplug it and move on
http://forums.corvetteforum.com/c4-t...-deletion.html
Last edited by C4GUY; Jun 30, 2011 at 02:48 PM.
Intermediate
Joined: Jul 2006
Posts: 25
Likes: 1
I am building a 383 for my 85 and like the idea of removing the air pump system if possible. Sounds like I can do this based on postings in this thread.
How will this effect the cat converter? The current system also appears to pump air directly to the converter?
Other than the pure mechanical aspect of doing this what exactly do I need to do to keep trouble codes from popping up?
I will be getting an upgraded PROM for the ECM so can this be handled then?
A quick summary would be fantastic!
How will this effect the cat converter? The current system also appears to pump air directly to the converter?
Other than the pure mechanical aspect of doing this what exactly do I need to do to keep trouble codes from popping up?
I will be getting an upgraded PROM for the ECM so can this be handled then?
A quick summary would be fantastic!