Relative humidity is the moisture off your sister's back as you are getting it on. OK seriously, increase humidity. Sprayer set to fine mist around the wires in a dark garage works.

Pulled one injector at a time. Each should make the motor run worse. If it does, put it back and proceed to the next one. If one influenced the motor less than the others, you have a starting point

 

thanks. Will try that this week. I'm talking about connectors only 👍

 

by slight miss do you mean a slightly rough idle?

i had two recent situations that gave me the type of misfire rough idle.

The first instance was on my 85, there was an injector wire broken. This does not throw a code and has nothing to do with the injector. You can test your injectors to make sure they are all firing with a noid light set. my said cost me $20, and I never in 1 million years would've thought that I would've ever had to use it to fix a problem. But there I was a year after about it and I discovered that I had one cylinder that was not firing because the injector was not firing. The injector itself was fine.

https://www.corvetteforum.com/forums/c4-tech-performance/3879174-i-have-one-very-quet-injector.html

The second instance I just had and I was getting a miss as I was driving down the road and the car was jerking or trailer hitching or fish biting. At idle it sounded the same almost as when I had a non-firing injector.


https://www.corvetteforum.com/forums/c4-tech-performance/3899042-fish-biting-jerkiness-hesitating-barking-1987-going-through-the-checklists.html


i also had a third instance where the coil was not pushing out the power it should. the only way i was able to diagnose this one was to do this crazy test:


but it did work 100%. i discovered my spark wS mediochre to not present. when i swap in a spare coil i had, i got a nice food spark.

it could also have been the ignition module.

in the case of fuel, if you have a fuel pressure gauge you would see either irratic pressure or low pressure when u got your symptims.

 

[
How do you use nous lights Do you have to pull connector off of injector to use it
Replaced coil and module already

QUOTE=VikingTrad3r;1593403101]by slight miss do you mean a slightly rough idle?

i had two recent situations that gave me the type of misfire rough idle.

The first instance was on my 85, there was an injector wire broken. This does not throw a code and has nothing to do with the injector. You can test your injectors to make sure they are all firing with a noid light set. my said cost me $20, and I never in 1 million years would've thought that I would've ever had to use it to fix a problem. But there I was a year after about it and I discovered that I had one cylinder that was not firing because the injector was not firing. The injector itself was fine.

https://www.corvetteforum.com/forums/c4-tech-performance/3879174-i-have-one-very-quet-injector.html

The second instance I just had and I was getting a miss as I was driving down the road and the car was jerking or trailer hitching or fish biting. At idle it sounded the same almost as when I had a non-firing injector.


https://www.corvetteforum.com/forums/c4-tech-performance/3899042-fish-biting-jerkiness-hesitating-barking-1987-going-through-the-checklists.html


i also had a third instance where the coil was not pushing out the power it should. the only way i was able to diagnose this one was to do this crazy test:


but it did work 100%. i discovered my spark wS mediochre to not present. when i swap in a spare coil i had, i got a nice food spark.

it could also have been the ignition module.

in the case of fuel, if you have a fuel pressure gauge you would see either irratic pressure or low pressure when u got your symptims.[/QUOTE]

 

[/quote]

 

Never mind. I watched video on how to use mood lights

 

noid lights super easy. simply unplug connector from injector and plug in the noid light. do it while running.

here is my dizzy test vid i forgot to link to:

it looks complicated but very easy.

https://youtu.be/rc9b0prqzKs

 

What are you doing there exactly?

 

testing spark.

my bad coil generated a weak spark every 10th or so rotation.

my vid and this vid is what you should have.

i tried the "coil test" using resistence values but mine showed it was good using that test.

but no spark!!!!!


https://youtu.be/F2yEu1g5trw

 

Well, that is pretty innovative.