C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

C4 turning off

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Old Apr 22, 2022 | 03:22 PM
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Iván A. Díaz's Avatar
Iván A. Díaz
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Default C4 turning off

Well my dad has a 1984 c4 it is and autamatic and it has almost 73k miles on it, the problem is that when we are running into the issue that when he accelerates hard the rpms go high(obviosly) but when he brakes the rpm goes down and dosent stay at iddle rpm it just keeps going down till the car stalls and the check engine light turns on and then when he starts it again the check engine light goes off and the car runs fine and dosent stall again unless you accelerate and brake like that again. I mean when you brake after accelerating a bit the car is supposed to still run right? We really dont know whats going on with it because the check engine dosent stay on and we cant check whats the problem

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Old Apr 23, 2022 | 06:36 PM
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Originally Posted by Iván A. Díaz
Well my dad has a 1984 c4 it is and autamatic and it has almost 73k miles on it, the problem is that when we are running into the issue that when he accelerates hard the rpms go high(obviosly) but when he brakes the rpm goes down and dosent stay at iddle rpm it just keeps going down till the car stalls and the check engine light turns on and then when he starts it again the check engine light goes off and the car runs fine and dosent stall again unless you accelerate and brake like that again. I mean when you brake after accelerating a bit the car is supposed to still run right? We really dont know whats going on with it because the check engine dosent stay on and we cant check whats the problem
What happens if you leave the car in park and just increase the idle to about 2000 rpm and then let it go back to idle? Does it stall out ??
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Old Apr 26, 2022 | 06:20 PM
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Iván A. Díaz's Avatar
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No it only stalls when running i thought i was low iddle but ive seen that the iddle for the cross injection motors is 600 rpm
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Old Apr 26, 2022 | 06:27 PM
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Power brake booster vacuum leak?
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