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

Idle issues

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Old Oct 10, 2006 | 04:37 PM
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Default Idle issues

I just had my LT1 383 from my Camaro installed into my C4 but it wont idle under 2000 rpm's. What all should I check?
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Old Oct 10, 2006 | 04:39 PM
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TPS voltage, IAC counts, and vac leaks for now...other will help.
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Old Oct 10, 2006 | 06:27 PM
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Originally Posted by honda hunter
I just had my LT1 383 from my Camaro installed into my C4 but it wont idle under 2000 rpm's. What all should I check?

Sounds like a bad install on the prom or a really bad vaccum leak.
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Old Oct 11, 2006 | 10:13 AM
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Originally Posted by Alvin
Sounds like a bad install on the prom or a really bad vaccum leak.
Today we discovered that when we replace the 37lbs injectors with the stock injectors the car idles a ton better. We think it may be in the tune? Could you check for me and see if they were set for 37's?
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Old Oct 11, 2006 | 11:25 AM
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What year model is the engine and what ECM are you using?
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Old Oct 11, 2006 | 03:16 PM
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Originally Posted by Casethecorvetteman
What year model is the engine and what ECM are you using?
The engine was used in a 94 but it's a 4 bolt main, vented opti motor. I'm using the 1993 computer with a chip from Alvin.
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Old Oct 11, 2006 | 04:42 PM
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Originally Posted by honda hunter
Today we discovered that when we replace the 37lbs injectors with the stock injectors the car idles a ton better. We think it may be in the tune? Could you check for me and see if they were set for 37's?

Those sound awfully big for a 383. It is super/turbochargered or have nitrous?

Is the computer programmed for 37's?
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Old Oct 11, 2006 | 05:14 PM
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Originally Posted by honda hunter
The engine was used in a 94 but it's a 4 bolt main, vented opti motor. I'm using the 1993 computer with a chip from Alvin.
No worries What does it run like with the stock tune on it? What is the fuel pressure set at?
Originally Posted by Cold_B
Those sound awfully big for a 383. It is super/turbochargered or have nitrous?

Is the computer programmed for 37's?
I think he is waiting to find out that bit of info from Alvin. If it is set for the right size in the tune then it wont really matter what size is used as long as its big enough to flow enough fuel. The computer will calculate how long each injector has to squirt for the required amount of fuel based on the size set in the tune.
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Old Oct 11, 2006 | 10:31 PM
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Originally Posted by Casethecorvetteman
No worries What does it run like with the stock tune on it? What is the fuel pressure set at?

I think he is waiting to find out that bit of info from Alvin. If it is set for the right size in the tune then it wont really matter what size is used as long as its big enough to flow enough fuel. The computer will calculate how long each injector has to squirt for the required amount of fuel based on the size set in the tune.
Ill try the stock tune and see how it works out. Just my luck it would be a problem with the tune after it took forever to get.
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Old Oct 11, 2006 | 11:22 PM
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Originally Posted by honda hunter
Ill try the stock tune and see how it works out. Just my luck it would be a problem with the tune after it took forever to get.
Its worth a shot mate
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