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Idling problem Corvette C3 year 1982 / injection

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Old Jan 29, 2025 | 11:56 AM
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Default Idling problem Corvette C3 year 1982 / injection

Hello group,
I come to you with a problem with a friend's 1982 Corvette C3.
A mechanic did not find this problem despite "full" checks.
The two of us (my friend and I), have already changed both idle air control valves. But still the worry present.

The problem: The idle speed increases a few times, rising towards 1500/1700 rpm
Sometimes, often even, it is great, as before this problem appeared.
The car starts great, drives great, runs great.

If any of you have encountered this problem and been able to fix it.
Personally, I hesitate to think that it is the injection.
I thank you in advance for your answers.

@+

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Bonjour le groupe,
Je viens vers vous pour un souci sur la Corvette C3 de 1982 d'un ami.
Un garagiste n'a pas trouvé ce souci malgré "plein" de contrôle.
Nous deux (mon ami et moi), avons déjà changé les deux soupapes de commande d'air du ralenti. Mais toujours le souci présent.

Le problème : Le ralenti augmente qqs fois, monte vers les 1500/ 1700 tr/m
Qqs fois, souvent même, il est top, comme avant ce souci apparu.
La voiture démarre très bien, roule très bien, tourne très bien.

Si l'un de vous aurait rencontré ce souci et pu le réparer.
Perso, j'hésite à penser que c'est l'injection.
Je vous remercie d'avance pour vos réponses.

@+
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Old Jan 29, 2025 | 12:38 PM
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The first things I would check are the base timing and look for vacuum leaks. After that check the throttle position voltage, EGR functions, and throttle body balance.
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Old Jan 29, 2025 | 01:43 PM
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This link may be of some help. You can also get a manual on ebay.
https://www.xfireperformance.com/faqs
https://www.ebay.com/itm/225598911568
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