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

No power down low, CEL up high

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Old Sep 26, 2020 | 10:36 PM
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Alejandro Guerrero's Avatar
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Default No power down low, CEL up high

1994 LT1 6 speed. I get very little power till 3500 rpm then it all comes back with all of my power. Then once I hit 4000 rpm the check engine light comes on till it drops back down then it goes off. Any ideas? I changed plugs and wires but it was hard to tell if the driver side ones where completely in though I think they are. I also cleaned my MAF Sensor and put a fuel injector cleaning additive kn the fuel. Any ideas?

Last edited by Alejandro Guerrero; Sep 26, 2020 at 10:47 PM.
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Old Sep 27, 2020 | 09:07 AM
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I pulled some codes and got 4. H55 and 4. H18. Could either of these be the culprit? Looks like it means fuel lean monitor and injector circuit.8
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Old Sep 27, 2020 | 01:15 PM
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I'm going to keep updating this because I couldn't find anything else like it so if somebody has a similar problem want them to be able to search. I got some MAF Sensor Cleaner and Sea Foam and ran both of those, car seems to be doing a little better but still not all there. I'm going to change my fuel filter next and if that's not the case may have to do injectors. Does anybody know a way of testing my injectors before I do this? I got a fuel pressure gauge to test my fuel pump as well but gotta figure out how to use it this week.
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Old Sep 28, 2020 | 03:46 PM
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Got it fixed, one of my fuel injector cables was loose. Got it on there with some struggle. For some reason it didn't want to go all the way on. Car runs like a champ again.
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Old Sep 29, 2020 | 01:49 PM
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Good Job there Alejandro!

It is amazing the simple things that get overlooked trying to solve a tough issue! Good Work on your part!! Those little cables connecting the injectors are getting older and on many Corvettes they are dried up and the insulation falls off. Be sure to keep an eye out for that!

It always feels better when you fix it the right way Yourself!
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