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

42lb. injector issues

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Old Dec 31, 2019 | 10:59 AM
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Default 42lb. injector issues

I acquired an 89 cheap but it wasn't running right.Very rough.Changed the fuel pump ign. module and injectors to 42lb. injectors. Now it floods out if I try to step on it.Feels like too much gas.What do I need to do to get it to run right?Chip change maybe?If so which one? Thanks in advance for any help.
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Old Dec 31, 2019 | 11:52 AM
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Go back to the stock 22lb injectors, or have a custom chip burned.
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Old Dec 31, 2019 | 11:56 AM
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Why in the world did you go with 42lb/hr injectors? I run that on a 398 because I have to, no way a stock engine would ever need that.

Go back to 22lb.
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Old Dec 31, 2019 | 12:11 PM
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DO NOT EVEN DRIVE IT. Park the thing and change the injectors. FIC might be able to swap them up?
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Old Dec 31, 2019 | 01:02 PM
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I listened to someone that I shouldn't have listened to.
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Old Dec 31, 2019 | 01:05 PM
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Who do you recommend to get a chip burned from?
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Old Dec 31, 2019 | 01:11 PM
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Originally Posted by bandit666
I listened to someone that I shouldn't have listened to.
It happened to us all at one time or another. As long as you don't wake up in a seedy motel with some big, hairy dude, you probably will be able to fix it.
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Old Dec 31, 2019 | 01:12 PM
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Originally Posted by bandit666
Who do you recommend to get a chip burned from?

For what mods?
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Old Dec 31, 2019 | 01:44 PM
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No modifications.stock
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Old Dec 31, 2019 | 01:58 PM
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Originally Posted by bandit666
No modifications.stock
Talk to Jon at FIC, have him set you up with the right sized injectors and see if he can do anything with this set or you can sell it and leave programming alone till you get some serious mods like headers and intakes and cam.
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Old Dec 31, 2019 | 02:35 PM
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Thanks,but I only bought the car to flip it because it's in great shape and got it cheap.I have a street strip 87 that runs 11.60sJust want to get it running right and sell it.



Last edited by bandit666; Dec 31, 2019 at 02:40 PM. Reason: add picture
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Old Dec 31, 2019 | 02:37 PM
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Originally Posted by bandit666
Thanks,but I only bought the car to flip it because it's in great shape and got it cheap.I have a street strip 87 that runs 11.60sJust want to get it running right and sell it.

Then leave it alone and change the injectors and you should be fine
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Old Dec 31, 2019 | 06:09 PM
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Originally Posted by bandit666
Thanks,but I only bought the car to flip it because it's in great shape and got it cheap.I have a street strip 87 that runs 11.60sJust want to get it running right and sell it.
No chip, change the injectors back to a stock size. Do not drive it.
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Old Jan 1, 2020 | 10:04 AM
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Like putting a 750 Holley Double Pumper Carburetor on a Chevette four banger..

Bigger is not always better when dealing with fuel systems.

Pretty Corvette!
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