LT1-LT4 Modifications 1993-97 Gen II Small Block V8

What's this go to thread

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Old Mar 10, 2013 | 03:54 PM
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First picture is pass side towards the pcm.
Also what exactly is that harness below my hand, because 2 wires are straight up ripped out.




Second, this is drivers side all the way back of the intake.
Something is deff unplugged, is this from the EGR delete?
Don't remember that before though.
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Old Mar 10, 2013 | 04:51 PM
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the line you are holding is the vacuum supply line for your hvac controls. there should be a one way check valve somewhere down around that hvac box that runs to the interior of your car. as for the wires you will need to take a picture of them. those connectors go to numerous different systems in the vehicle
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Old Mar 10, 2013 | 10:16 PM
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1st pic If the other end of that vacuum hose is hooked up at the intake, you have a vacuum leak.

Wiring is C100 or C105.

2nd pic

Last edited by shbox; Mar 10, 2013 at 10:23 PM.
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Old Mar 11, 2013 | 12:05 AM
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Originally Posted by EDS01SS
the line you are holding is the vacuum supply line for your hvac controls. there should be a one way check valve somewhere down around that hvac box that runs to the interior of your car. as for the wires you will need to take a picture of them. those connectors go to numerous different systems in the vehicle
Will do thanks.

Originally Posted by shbox
1st pic If the other end of that vacuum hose is hooked up at the intake, you have a vacuum leak.

Wiring is C100 or C105.

2nd pic

Once again thanks for your vast knowledge.

That vac line in the first pic runs into that harness that's below my hand, not the intake from what i saw, but looking at the wiring harness diagram you provided looks like it should connected towards the back and that runs into the intake?

And what is my 2nd picture / is it needed to be plugged in? Looks like the EGR right? Which i don't have.
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Old Mar 11, 2013 | 06:15 AM
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Originally Posted by 02v8ta
And what is my 2nd picture / is it needed to be plugged in? Looks like the EGR right? Which i don't have.
it goes to the charcoal canister purge. it is not "required" but it might be by law in your area and is one of those things more people will tell you to keep than to delete.
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Old Mar 11, 2013 | 06:37 AM
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The second one is to the EGR solenoid-not EVAP. If you don't have the EGR stuff, it's kinda hard to plug it in, eh? If EGR is programmed out, there should be no issue.

Yes, the vacuum line goes into the wiring harness and comes out at the intake.
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Old Mar 11, 2013 | 09:10 AM
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Thanks everyone. Hopefully this is why my
Idle has been fishy lately.
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Old Mar 11, 2013 | 04:26 PM
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Okay part 2, making sure I have this right.
The first picture is two ends of a vac line i believe. The one towards the back runs into the wire harness and i assume into the intake. This is what i need to connect to the other vac line pictured to resolve the vac leak? If so i'll need a new fitting because they don't go together, that's why i'm slightly confused.




The connector(s) pictured in 1 & 2 I believe are the A/c compressor and pressure senors? The car doesn't have AC so that would make sense

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Old Mar 11, 2013 | 04:38 PM
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You must not have looked at the picture link I posted. You are missing the vacuum check valve. That is what those connect to. Three hoses connect to it.
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Old Mar 11, 2013 | 04:46 PM
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just one of those weeks i'd probably forget how to ride my bicycle if i got on it. Thanks. Only $14 on amazon i can live with that.
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Old Mar 11, 2013 | 04:52 PM
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damn sorry for the bad info
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