My 82 gasps when I quickly accelerate
Thread Starter
Cruising
Joined: Feb 2006
Posts: 10
Likes: 0
From: Yorktown Virginia
My 82 gasps when I quickly accelerate
I am driving normal and then decide to rock and roll..... I stomp on the accelerator and the engine gasps like I just kicked her in the stomach. Only by working my foot slightly off the acclerator and then back on will finally get her going. Anyone know what my problem might be? Fuel pump? I am also looking for a reliable mechanic with a good reputation who knows 82 Vetts. I live in Yorktown, VA. Thanks in advance. vr/Pat 
5th Gear
Joined: Feb 2006
Posts: 5
Likes: 0
build water what
what is the tps and build water thing? I too have a 82 and adding horsepower with dual,headers, chip but it would be nice to figure out what you are talking about. I'm thinking it needs a tune up, points plug wires air filter you know standard stuff. what is the miles on your 82?
Racer
Joined: Dec 2005
Posts: 474
Likes: 127
From: Stafford Virginia
TPS is the Throttle Position Sensor (see the rear throttle body with three pong weather pack connector)
Manometer is used to measure draw/vacuum of water in inches. The goal is 6"
See Article
Manometer is used to measure draw/vacuum of water in inches. The goal is 6"
See Article
Thread Starter
Cruising
Joined: Feb 2006
Posts: 10
Likes: 0
From: Yorktown Virginia
Guys: I really appreciate all the comments. I have had this car since 1986. It has 70K miles on it, (bought it with 13K miles). Being a cross-fire injection it has no points. The article that you all enclosed is very good. The mechanic today was creating a gerry-rigged adapter that he could afix to the TBI to measure the fuel pressure. I can't find anything in my research otherwise that would point to anything else. The wires are new. Ran almost like hell until I took it in to the shop now it has problems. Arghhhhhhhh! 
Racer
Joined: Dec 2005
Posts: 474
Likes: 127
From: Stafford Virginia
Not many mechanics know how to adjust CFI setups as I believe they were only used from 82 to 84. They usually do more damage then good and then you have to find someone that really knows how to adjust the setup. Your issue could have been as simple as a fuel filter but if someone adjusted the CFI you'll have to deal with that in addition to finding out the first problem.
I'm a newbie with CFI but I can tell you I've done my homework to ensure "I" know how to get the car running the way it should.
Cross Fire Forum
This site maybe down right now but it's been a great resource for me. I've rebuilt my throttle bodies and replaced all the gaskets and injectors....runs like a champ although I'm still waiting on the idle to settle as I can't drive it to reset the Idle Control Valves due to suspension rebuild I'm doing.
I'm a newbie with CFI but I can tell you I've done my homework to ensure "I" know how to get the car running the way it should.
Cross Fire Forum
This site maybe down right now but it's been a great resource for me. I've rebuilt my throttle bodies and replaced all the gaskets and injectors....runs like a champ although I'm still waiting on the idle to settle as I can't drive it to reset the Idle Control Valves due to suspension rebuild I'm doing.
Instructor
Joined: Dec 2003
Posts: 183
Likes: 0
From: ca
I too had an 1982 collectors edition. I had the same issue. A massive hesitation on acceleration. A few things to look at if you dont pull any codes which point out a problem.
Plugged up Cat. Converter.
Wrong Gas Cap
Dirty Fuel Filter
Bum Fuel Pump
I would check in that order. Good Luck!
fm
Plugged up Cat. Converter.
Wrong Gas Cap
Dirty Fuel Filter
Bum Fuel Pump
I would check in that order. Good Luck!
fm
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Le Mans Master
Joined: Mar 2002
Posts: 8,575
Likes: 3
From: On an island surrounded by sharks Hawaii
When you say 'gasps', do you mean it hesitates and then goes.
My 82 was hesitating on quick accelerations. I found an old post that
said to disconnect the EGR valve hose. I did this last week and now the problem is gone. I think the EGR valve was bad and it was also creating
a vaccuum leak and high idle. Now that I disconnected the hose and plugged the hose and EGR valve inlet the Vette runs better then it ever did.
HTH
My 82 was hesitating on quick accelerations. I found an old post that
said to disconnect the EGR valve hose. I did this last week and now the problem is gone. I think the EGR valve was bad and it was also creating
a vaccuum leak and high idle. Now that I disconnected the hose and plugged the hose and EGR valve inlet the Vette runs better then it ever did.
HTH
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
I have an 82 and had a similar problem. I would first change the fuel fitler. if that does not solve your problem change the fuel pump. If it ran fine before and is not throwing any codes its very likely the fuel system. Most likely the fuel pump. stock pump supplies 9-13 psi at peak performance. If it gets weak it tends to drop to about 7 psi. No where near enough. If you are going to change the fuel pump buy a 1985 pump. Its what everyone is doing. This supplies close to 40 psi and the pressure is stepped down by the regulator in the driverside TBI.
Jim
Jim
Drifting
Joined: Oct 2004
Posts: 1,496
Likes: 1
From: Lafayette Louisiana
Originally Posted by Bradcool
what is the tps and build water thing? I too have a 82 and adding horsepower with dual,headers, chip but it would be nice to figure out what you are talking about. I'm thinking it needs a tune up, points plug wires air filter you know standard stuff. what is the miles on your 82?
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Originally Posted by Bradcool
what is the tps and build water thing? I too have a 82 and adding horsepower with dual,headers, chip but it would be nice to figure out what you are talking about. I'm thinking it needs a tune up, points plug wires air filter you know standard stuff. what is the miles on your 82?
the TPS is on the driverside TBI. It stands for Throttle position sensor. It basically tells the computer if you are idling or excellerating. It works on voltage.
The water thing is a guage used to balance the two throttle bodies. You can't use a regular vaccum guage because of the throttle bodies sensitivity. Each TBI has to be set at 6 inches of water. There is a capped port on each TBI. This is were you plug the water thing (manometer..proper name) to. This site gives you a new discription http://corvettefever.com/techarticles/4688/index.html
Jim
Racer
Joined: Jan 2002
Posts: 375
Likes: 0
From: Palm Bay FL
Originally Posted by jdp6000
I have an 82 and had a similar problem. I would first change the fuel fitler. if that does not solve your problem change the fuel pump. If it ran fine before and is not throwing any codes its very likely the fuel system. Most likely the fuel pump. stock pump supplies 9-13 psi at peak performance. If it gets weak it tends to drop to about 7 psi. No where near enough. If you are going to change the fuel pump buy a 1985 pump. Its what everyone is doing. This supplies close to 40 psi and the pressure is stepped down by the regulator in the driverside TBI.
Jim
Jim
Also, go to http://www.crossfire.homeip.net for more info on your '82.
Thread Starter
Cruising
Joined: Feb 2006
Posts: 10
Likes: 0
From: Yorktown Virginia
Solved The Problem!! :)))
Gents: thanks ever so much for all the information. I went deep into the internet last night and found the cross fire injection forum website and spent hours researching. The mechanic did all the right things, vacumn hoses, O2 sensor, FPG readings,..... then I read where all the 82 drivers were changing their fuel pumps out with an 85 Vette FP. They cited all the same issues that I had, choking when I stomp on the accelerator. I called the mechanic and discussed the issue with him. He, overnight, came to the same conslusion and ordered a new fuel pump before COB, an AC Delco for an 82. The car has never run better since I can remember!! Hauls A$$!! It was the fuel pump, the 26 year old pump could not take it any more. Thanks to everyone for taking the time to add a comment. I learned an aweful lot. Really appreciate it. Great forum!! Cheers!! 
Last edited by 82SilvergreenVett; Feb 23, 2006 at 10:47 PM. Reason: spell check
Team Owner
Joined: Oct 2004
Posts: 46,940
Likes: 2
From: Diesel smoke Makes me horny
St. Jude Donor '05-'06-'07-'08
Originally Posted by 82SilvergreenVett
I am driving normal and then decide to rock and roll..... I stomp on the accelerator and the engine gasps like I just kicked her in the stomach. Only by working my foot slightly off the acclerator and then back on will finally get her going. Anyone know what my problem might be? Fuel pump? I am also looking for a reliable mechanic with a good reputation who knows 82 Vetts. I live in Yorktown, VA. Thanks in advance. vr/Pat
Burning Brakes
Joined: Nov 2005
Posts: 924
Likes: 15
From: DFW Metroplex Texas
Originally Posted by 82SilvergreenVett
I called the mechanic and discussed the issue with him. He, overnight, came to the same conslusion and ordered a new fuel pump before COB, an AC Delco for an 82.
5th Gear
Joined: Feb 2006
Posts: 5
Likes: 0
hesitation
I too have the same problem... i just replaced all the ignition, put headers on it (O2 in collector) but fuel filter and pump are original. I added a hypertech chip howeve4r did not notice much difference. I will start with the filter (cheapest) then go to a 85 fuel pump will that work. Isnt the fuel pump inside the gas tank? how hard is it to replace?
thanks
bcool
thanks
bcool
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Easy to get at. It comes out through the top of the gas tank...remove the gas lid etc. Don't forget to disconnect the battery. I would say 99% fuel pump related. Go with an 1985 pump.
Jim
Jim
Thread Starter
Cruising
Joined: Feb 2006
Posts: 10
Likes: 0
From: Yorktown Virginia
Update
Appreciate the responses. Appologize for being out of town lately. The Fuel Pump that we put in was the stock 82 fuel pump. I believe that no matter what you do it would be the same, either a 82 or an 85 fuel pump, (someone correct me if there is a different take). The computer and the fuel injectors limit any upping of the standard that came with the car. The fuel pump is on the sending unit, both of which are in the fuel tank. 
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Originally Posted by 82SilvergreenVett
Appreciate the responses. Appologize for being out of town lately. The Fuel Pump that we put in was the stock 82 fuel pump. I believe that no matter what you do it would be the same, either a 82 or an 85 fuel pump, (someone correct me if there is a different take). The computer and the fuel injectors limit any upping of the standard that came with the car. The fuel pump is on the sending unit, both of which are in the fuel tank.
The rear TBI regulates the fuel pressure. It can only bring the psi down it can not increase it.Stock 82 is 9-13 psi. Stock 85 I believe is about 40 psi. I went with the 85 fuel pump. Regulator in the rear TBI brings it down to what it should be.
Depending on the conditons you may still get the occational hesitation with the 82 pump. The reason many are installing the 85 is to elliminate any possibility of this. Also some modify their TBI's and other parts and they require a higher psi pump.
Long and short of it. If your going to do it you may as well us the 85 pump. Same efford to change it.
Jim