good morning my name is Massimo and I am writing to you from Italy. I am the owner of a corvette c3 collector edition 82 crossfirejniection, and more often than not, when I walk I get revved up and make no mention of lowering the engine revs. I have to stop and put the gear into parking then after a few minutes the number of revolutions is lowered and so I can start without panic. I think it's the microcips of the computer located in the back seat what do you think?
practically the car I turn it on from cold it revs up engages the automatic start for a few minutes and then lowers slowly, I go out of the garage and it works well at 1000 rpm, I go for a ride, when it is hot and engages the third gear and still over drive, it remains at 3000 rpm, then I stop for 5 minutes and I have to put in neutral and the car goes down slowly, if I don't do this you always walk at º 2500 rpm without lowering the rpm of the engine, here in Italy they know these cars well I am mortified, I do not want to sell this car because I am in love and I love it. the previous owner told me that he had to modify the injection because it did not work well the car emits a lot of petrol smell , I thought about the control unit or the microcips.
Thanks for the reply

 

WOW. Not certain how this is getting translated from Italian. But it's certainly not coming through very well.
first. Do you own a fuel pressure gauge and do upu have a scan tool to read codes?
second, do you have a Factory service manual.
If not get all three. NOW.
Then we can guide you through diagnostics.
and see if you can find someone who speaks English to help you better translate.
Cheers Mate

 

Change the IACs...

 

[Quote = 4-Vettes; 1.602.029,119 mila] WOW. Non sono sicuro di come questo venga tradotto dall'italiano. Ma di certo non sta andando molto bene.
primo. Possiedi un manometro del carburante e hai uno strumento di scansione per leggere i codici?
secondo, hai un manuale di servizio di fabbrica.
Se non ottieni tutti e tre. ADESSO.
Quindi possiamo guidarti attraverso la diagnostica.
e vedi se riesci a trovare qualcuno che parli inglese per aiutarti a tradurre meglio.
Cheers mate [/ QUOTE]
to write here I do the translation in google, unfortunately I don't speak English. and here in italy i realized that few mechanics know how to fix the engine of this car, maybe there will be someone here in italy who will be able to fix this car but i currently don't know anyone, when i bought this car last october 2019 the previous one the owner told me that his mechanic has modified the injection precisely because it did not work well, you can see in the engine compartment that there are new components such as a box like a relay on the passenger side, to the right of the wiper motor, the solenoid that must be connected via a rubber tube from the solenoid to under the air filter always on the left side of the passenger inside the engine compartment, I also saw inside the two throttle bodies there are two wires for each one, these are new.

 

to write here I do the translation in google, unfortunately I don't speak English. and here in italy i realized that few mechanics know how to fix the engine of this car, maybe there will be someone here in italy who will be able to fix this car but i currently don't know anyone, when i bought this car last october 2019 the previous one the owner told me that his mechanic has modified the injection precisely because it did not work well, you can see in the engine compartment that there are new components such as a box like a relay on the passenger side, to the right of the wiper motor, the solenoid that must be connected via a rubber tube from the solenoid to under the air filter always on the left side of the passenger inside the engine compartment, I also saw inside the two throttle bodies there are two wires for each one, these are new.

 

what is IAC I need a photo thanks

 

The IAC is the Idle Air Controller.
this could be the trouble, I suppose. But personally I would trouble shoot more precisely before just changing parts.
if the previous owner has changed things substantially, this could be difficult to trouble shoot over the net.
any chance you could contact previous owner and get more info on just what changes where made?

 

At idle, the throttle plates are completely closed on a EFI system of this type. The IAC or sometimes called a stepper motor opens a side port that allows bypass air that go's around the throttle plates. A defective IAC can cause a erratic idle. Or a high idle, or no idle.
perhaps the previous owner did something to crack the throttle plates open, like on a carburetor because he had a idle problem, rather than repair it correctly.
Getting information about what the previous owner did would be extremely helpful.

 

unfortunately I am not able to get in touch with the previous owner. but I'll take pictures of the engine, maybe you'll understand something more

 

Try to verify that the throttle blades are completely closed at idle and that there is some slack, or freeplay in the throttle cable.
also, if you can get a reading on fuel pressure, this could be helpful. Car should be running 12-13 PSI between the throttle bodys.

 

the iac regulates idling and is controlled by the ECM. some people say you can clean the two iac, but that hardly helps. Buy 2 new ones at rockauto.com and you'll have peace of mind.

 

haaaa ok

 

[QUOTE = Maxim0; 1.602.029,468 mila] haaaa ok [/ QUOTE]




















this is my engine

 

Please Check out, if you buy the IACs, That they are from AcDelco. They are the best in my opinion

 

You also should test the water temp senor in Front of the motor. You have 2 of them. One an the driver side and one in the Front. The Front sensor is for the ECM

 

ok i inquire about this problem thanks

 

the car after an hour of walking heats up a lot to my legs inside where you put your feet on the ground it heats a lot I think the fan does not do its normal job

 

Lots of great information that may help. How is the exhaust flow? Could the catalytic converter be bad?

https://www.corvetteforum.com/forums...solutions.html

 

the Corvette always gets quite warm inside when driving. It's the same with me too. it is important that the water temperature is within the normal range.

 

sorry for this question you are a mechanic, could you repair my corvette? maybe you live near Venice