I bought this 82 Corvette as a project car. I know some say why waist my time with this since it has the Crossfire Injection on it. I like this body style and this is the last year with this body style. So any way the car has set for years it runs I have replaced plugs, wires, rotor, cap. In the driveway it ran good with a slight miss. I drove a half mile to fill it up with gas after starting it and driving home it had a miss like running on half the cylinders. After getting it home a put the charger on it thought maybe battery was low then started ran OK. Then done the same thing. I found that one of the throttle bodies was leaking fuel. So I rebuilt the throttle bodies It started and idled fine but had a slight miss. Now won't idle runs at higher rpm's but running on half the cylinders. I have replaced the Throttle position sensor and the map sensor. Still won,t idle and running on half the cylinders.I read about a torque converter lock switch (don't know where it's located ) could this be true. I have checked for vacuum leaks replace most vacuum lines all seems good. Could it be the coil. Any suggestions please
Daryl

 

Hello Daryl, congrats on your 82, don't listen to those people about the CFI, Alot of us here have 82's and although they can be finicky at times, the CFI is a great induction system, once you get to understand how it works. And we are all still learning.... as least I am...

What you need to do first is read the "sticky" above, it will provide you with alot of info and troubleshooting procedures, along with questions answered here to get your 82 running correctly.
It can be a number of things, that is why you should go through the "sticky".
Just a thought or two from what you are describing, after you rebuild or replace the TB's, your IAC's have to be reset for the engine to idle correctly. And you also have to balance out the TB's after rebuilding or replacing......
Also from what you are sayin, it can be an electrical ignition problem, such as the ignition module, etc., etc. These and other procedures are in the "sticky" and should be followed to help elimate replacing working parts (as you have already done so) and not getting the proper results. The procedures take time, and will also aid in helping you get familiar with the various systems on the CFI.
Start with them and post additional questions and or comments here to help you along................................... ..Tom

You should also purchase the 82 Corvette Shop Manual & AIM.......great books....

 

The "sticky" is a must when starting out on an 82. I will tell you 82 CFI vette's don't like sitting and dead batteries! The dripping injector tells me its gummed up and you will need a replacement injector (very easy job) or try running cleaner through it for a 100 miles or so .

The IAC will self adjust over time as the ECM learns the parameters again. This happens whenever the battery power is removed but it will never be correct until the injector is spraying properly. At this point, I would replace both inj as long as nothing else on the TBs is leaking. Rockauto carries inj and TB rebuild kits. All very simple (much easier than a carb!)
Good luck! I run my CFI vette almost everyday!!!

 

Sticky will get you there! Cfi is way better than any carb (for driveability)

 

OK after ordering a book then Finally getting the 62-82 shop manual and getting back from vacation I'm back at work on my 82 Corvette. I rechecked the vacuum lines, started the car running at higher RPM because it won"t idle and checked for intake, throttle body and any other places i could think of for vacuum leaks. I sprayed with WD-40 type spray. Didn't change anything. I then unplugged the injector on the right side did not change the way it was running I then plugged it back in. So then I started it back up and unplugged the left side the car died. Well to me that tells me that the right side is not firing for some reason that's way it sounds like it is running on half the cylinders. So I plugged it back in started the car again done the same thing unplugged the left injector again, it once again died the back fired. So I'm convinced that it is something to do with the right throttle body, it sprays as if the injector is working could the regulator be out of adjustment some how? any suggestions all?

 

Are both your injector fuses good? Are all your fuses good for that matter? Not just good, but pull them, clean the terminals, then put them back. Just a cheap possibly free thing to try.

 

Will the engine run with the left injector disconnected when the engine speed is over 2000rpm? Bring the engine up then disconnect the injector.

 

I will check all the fuses. I did have the engine rpm's up when I unplugged the injector but would just die.

 

The car can run on 1 TB but the other letting air in will mak the car die at low rpm.
The big question is, can you see fuel shooting from both injectors? Harbor Freight carries the Noid lights to check the fuel pattern.

Next is the biggest problem plaguing all 82- 84 vette's! It is an open plenum under the plate the TBIs are bolted too! GM used silicon to seal it. It always has a vac leak until you get the felpro gasket and install!!!

Next, if someone pulled the TBIs off there's a few differences between them. The rear TB is the only one that has the fuel pressure regulator. The front has nothing.
The rear has the return line to the tank where the front has its return line feeding the rear TB.

Shoot us some pics! I would like to see it

 

hugie, can you explain how the Noid lights work on our 82's
I am curious.....either post here or send me a PM if you don't mind....
thanks.......Tom

 

I can see fuel from both injectors. It's like its getting fuel but not firing. Is there a signal that would cause this side not to fire. I checked the fuses all good connections. When I rebuilt the TB it had what looked like two regulators though one was different.

 

When I rebuilt these I done one at a time. I started with the front one right side because it was leaking fuel from what looks like a regulator. After I rebuilt this one the car started and idled fine. I then rebuilt the other one, when I installed it the car started and idled fine even though still had a slight miss after rebuilding both. Then started acting as it did before running on half the cylinders. Both injectors are spraying looks like same pattern

 

The rear TB has the regulator, the front has a compensator to compensate for the fuel pressure drop between the TBs.

 

bpassmore you online

 

Here is a quick question if the fuel is low could that affect the front tb. After checking some things out the car started acting as if it was running out of fuel. I filled the tank drove home fron gas station not driving on the road sence. T looked into the tank looks to be out so i'm, going to get some more fuel see what happens.

 

If it was trying to run out of fuel it might. When you rebuilt the TBs did everything look right? Get your timing light and look at the spray pattern, it should look a fandango dancer's skirt with no drips. (However mine does at times.)
A note: at times after a prolonged idle it will start to ilde a little rough, I believe this is caused by gas condensing and puddling under the TBs.

Have you cleaned the fuel tank?

 

This thing is new to you and has sat for several years. You may have a failing pump or an internal leak in the tank the hose connection the pump to the outlet tube could be suspect.
I have got some questionable fuel a few weeks ago.

 

noid lights tell you that they are getting a signal to fire the injector.its like a test light.

 

I filled the tank up with 5 gal, still acts like its not getting fuel. When I bought the car the guy removed the fuel tank and replaced the fuel pump and the hose and cleaned out the tank. With a flash light what I can see the tank looks clean. I have worked on a lot of cars just not familier with fuel injection or this car. I'm going to remove the fuel filter to see if it has plugged. Is there just the one under the car our is there another one hidden some where?

 

when looking at the fuel spray both look as if to have a fandango dancer's skirt an a little drip some times