lancer013

Hi everyone I'm new to the forums and to the corvette seen I'm having a problem with my 82 corvette collectors edition has a really high idle 1500-2000 sometimes goes down to 1000 when go to Rev it sputters out or chokes at 3500 I recently changed fuel pump and sending unit because sending unit was broken changed plugs the coolant switch map sensor when Goin to drive in gear as soon as I press the gas chokes out immediately car will run and drive but once I press gas it chokes out my cones our nice and strong and wide the iac vacuum sucks I sprayed carb clean around the plenum no idle change thanks for input

usmilret

Lancer I would start isolating any and all vacuum leaks.I have a 1982 that had the same problem.

Lakeside49

Check out the excellent Crossfire "Sticky" here on this forum! It includes an almost exhaustive list of related information. It has given me a couple of 'a-haa' rushes and a higher level of confidence about the technology in our cars.

Also, welcome to the C3 club.

billschroeder5842

I have a 82 as well.

Vacuum leaks are the scourge of these cars. Mine ran "okay" when I got it but after a few hours tracing and replacing hoses, my car runs very well and hold a steady 16.5 hg at idle.

For me, the main culprit was the headlight system and hoses leading into heat/ac-- which are on the same system.

Start there and see what happens.

lancer013

Thanks will look at sticky also my headlight won't flip up also will check all vacuum again

billschroeder5842

No headlights?

That sounds like your disconnect. There is a main connect vacuum line on the rear of the engine.

No head lights and hi idle sounds like you may just have a hose disconnected?

lancer013

Yes correct lights do not flip up at all where is this connect located

billschroeder5842

See the arrows, especially where it says "T fitting. Checks these as it is the first connection from the engine to the lights vacuum source.

lancer013

Vacuum seen to be sucking

lancer013

As soon as I hit gas pedal when driving dies car will only drive when not passing gas pedal

hugie82

Mark the distributor on the base and a corisponding spot on the manifold. Then advance the timing. Turn the distributor counter clock wise a 1/4 inch and see if it improves. Even a massive vac leak the engine will still rev. It sounds like the timing is very far retarded or worst case , the timing chain could have skipped a tooth.
I'm assuming the fuel pump was installed correctly and fuel pressure is correct.

lancer013

Sometimes with high idle it Wil Rev smooth til 4500 but once in gear and go to drive as soon as I press the gas pedal instant choke will try checking timing and playing with distributor

lancer013

I played with distributor if advance it no change retard won't work to much I know I'm getting spark so do u think timing is off

lancer013

billschroeder5842

Ok, I'm going to say that you need to check your fuel pressure. If the timing is good then you may have fuel issues.

These CFI are notorious for fuel pressure being to low to run right. I put a 85-89 fuel pump in my tank and it was like a different car.

terry82

car at temp .car in park what is the idle speed?what do the plugs look like ?does it start good ?Has the fuel filter been changed?Two problems with cross-fires ,vac leaks and bad fuel pumps.One more thought ,did your problem come on gradualy or sudden?

lancer013

Brand new parts plugs mapsensor coolant temp sensor fuel filter and pump with new sending unit plugs were black and smelled like gas start first crank idles from 1000 -1800 blocked the main vac port no changes when I got the car it was like that my gas gauge was reading empty now it's stuck on full mark do u think ground

terry82

it sounds like you have been busy.https://1982corvette.shutterfly.com/...s:albumId=300i would replace fuel pump and check the wires .there also maybe a liner in there that is holding the arm of the sending unit .The idle speed tells me vac leak.

lancer013

On the new sending unit it self didn't have the small circle thing would I have to put it back on

terry82

cant remember circle thing can you post a pic