LT1 AIR pump delete
Thread Starter
Instructor
Joined: Apr 2003
Posts: 104
Likes: 0
From: Dublin OH
LT1 AIR pump delete
The AIR pump on my '92 LT1 is really loud. Up till now I've just ignored it and waited for closed loop so that it would shut up. I could replace it but I rather just disconnect or disable it. I tried simply unplugging it but got an idiot light. Can anyone advise how to disconnect this thing without the engine knowing? :-)
BTW, I searched like a good boy and didn't see this asked.
Thanks!
John
BTW, I searched like a good boy and didn't see this asked.
Thanks!
John
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
My 93 comes on when I disconnect mine. I actually had it hooked up electrically, for awhile but the hose not connected and it sounded like a shop vac under the hood. 
Mine is getting till it wines when it is on so I know what you mean by the sound. If I were you, I would send a e-mail to www.pcmforless.com and ask Alvin if it can be programmed out. But my concern would be how will it effect an emissions test and will it harm the converters by not running.
Mine is getting till it wines when it is on so I know what you mean by the sound. If I were you, I would send a e-mail to www.pcmforless.com and ask Alvin if it can be programmed out. But my concern would be how will it effect an emissions test and will it harm the converters by not running.
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Originally Posted by jstkrsn
I could sware my 92 doesn't have an air pump. I put shorty headers on and there are no air line hook ups.
Its an electric pump on the drivers side down under the headlight bucket.
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
Originally Posted by 93 ragtop
My 93 comes on when I disconnect mine. I actually had it hooked up electrically, for awhile but the hose not connected and it sounded like a shop vac under the hood. Mine is getting till it wines when it is on so I know what you mean by the sound. If I were you, I would send a e-mail to www.pcmforless.com and ask Alvin if it can be programmed out. But my concern would be how will it effect an emissions test and will it harm the converters by not running.
Mine is getting till it wines when it is on so I know what you mean by the sound. If I were you, I would send a e-mail to www.pcmforless.com and ask Alvin if it can be programmed out. But my concern would be how will it effect an emissions test and will it harm the converters by not running.There are also some biasing the computer uses when the airpump is active.. I remove those but it shouldn't cause any noticable difference.
Can I ask.. Why remove it? it doesn't help performance any.
Thread Starter
Instructor
Joined: Apr 2003
Posts: 104
Likes: 0
From: Dublin OH
I didn't check the code, cuz I knew why the light was on. Hooked it back up and the light was off.
By "programming it out" I presume you mean a custom PCM chip which doesn't throw a code. Neat idea but for that amount I could probably replace the pump (presuming a new pump would be quiet).
What I'd really like to do is "hotwire" the connection so the computer thinks the pump is still there.
John
By "programming it out" I presume you mean a custom PCM chip which doesn't throw a code. Neat idea but for that amount I could probably replace the pump (presuming a new pump would be quiet).
What I'd really like to do is "hotwire" the connection so the computer thinks the pump is still there.
John
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
That might work. I just dont know. I do know when I first put my headers on and did not have the pump tied in, it would set a code and turn on the light. With the pump plugged in but not plumbed, it sounds like a shop vac. 
Good luck, and let us know if you find a way to bypass it without programming it. 
Good luck, and let us know if you find a way to bypass it without programming it.
Melting Slicks
Joined: Oct 2005
Posts: 3,178
Likes: 5
From: Daleville Indiana
St. Jude Donor '08
With me the car fixed its self. The pump was bad when I got the vette so pulled everything out. The light was on for about two months then one day I went to start the car there was a pop and everything was dead. When I started to unhooked the battery I could hear the relay clicking. I hooked the battery back up and everything was fine. Sense then no light and no code.
Thread Starter
Instructor
Joined: Apr 2003
Posts: 104
Likes: 0
From: Dublin OH
I've shopped around and finding a replacement for this pump is HARD and the one that I did find was EXPENSIVE, like over $300. Surely (Shirley?) others have encountered this problem and simply disconnected the pump as I did, encountered the code as I did, and figured out a way to trick the ECM into thinking the pump was operating normally. So, I will ttt this thread one more time.
TIA!
John
BTW, glad you like the avatar. Title of the image is something like "Winner of the 'not my job' award"
TIA!
John
BTW, glad you like the avatar. Title of the image is something like "Winner of the 'not my job' award"
Thread Starter
Instructor
Joined: Apr 2003
Posts: 104
Likes: 0
From: Dublin OH
That's all I want. I agree to your terms so long as you provide your own transportation to Ohio!
Seriously tho, if you know of an adapter I am all ears!
Keep in mind that this is a '92 LT1 with an electric AIR pump, not an L98 with a pulley driven pump.
John
Seriously tho, if you know of an adapter I am all ears!
Keep in mind that this is a '92 LT1 with an electric AIR pump, not an L98 with a pulley driven pump.John
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
I don't think you understand what I mean..
I can burn a memory adatper chip that plugs in between your stock chip and stock computer. It will have the stock program on it minus the Airpump checks and enrichers.
On another note I will be in NE ohio doing a tuning day in the next month or so
I can burn a memory adatper chip that plugs in between your stock chip and stock computer. It will have the stock program on it minus the Airpump checks and enrichers.
On another note I will be in NE ohio doing a tuning day in the next month or so
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Originally Posted by Alvin
On another note I will be in NE ohio doing a tuning day in the next month or so
I'm replacing the timing chain and upgrading to the '95 Opti. If that doesn't fix my problem I'm hosed. Racing season starts April 1...
Thread Starter
Instructor
Joined: Apr 2003
Posts: 104
Likes: 0
From: Dublin OH
Originally Posted by ScaryFast
Thingfish - I might still have my AIR pump from my '93. I'll check, and if I do you can have it for shipping.
BTW, I've taken the thread with Alvin to PMs to see if he can burn me a chip.
John
