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

Hoses from Throttle body??

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Old Nov 5, 2008 | 04:16 PM
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Default Hoses from Throttle body??

Hello, just have a quick question I couldn't figure out from the haynes manuel or by doing a search.

I have a 93 LT1. Facing from the front of the car there are two vacuum hoses coming from the TB, right behind the IAC. One of them goes to the left valve cover and the other hose goes to.....nothing? I know this plugs in somewhere but I don't see a place for it.
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Old Nov 5, 2008 | 04:40 PM
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I beleive the other would go the the EVAP, but I don't know that if it's setup like that on a '93.
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Old Nov 5, 2008 | 04:43 PM
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Originally Posted by the_merv
I beleive the other would go the the EVAP, but I don't know that if it's setup like that on a '93.
thats what i thinking
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Old Nov 5, 2008 | 05:36 PM
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That is possible, I'm finding this car is kind of a Frankenstein and has parts off of quite a few different cars.

I was going to just cap it, but when i closed it off the idle dropped quite low, so should I just cap it or rig it up so it feeds of the intake?Is it safe to drive capped and see what happens?
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Old Nov 5, 2008 | 05:46 PM
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Yea, if you think it's a Vacumn Port, cap it off..
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Old Nov 5, 2008 | 05:47 PM
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yea see what happens...as long as its not missing and running rough dont worry about it....let her fly bro
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Old Nov 6, 2008 | 12:10 PM
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Ok, I found where the hose is suppose to go. here are some pictures-

Goes from the TB to around the back of the engine.....

Then to this thing, then continues and runs besides the fuel lines.. That would be an Evap, correct?

Also, I see the plug in for what I belive is the EVAP solenoid. So in short it looks like I'm missing a EVAP solenoid!


Isn't there a code etched on the engine block somewhere that I can lookup to tell if this engine is not the original? The guy I bought the car off of didn't know much about it himself so anythings possible I guess.



Also, where connector that enables you to read SES codes?

Last edited by adamj1982; Nov 6, 2008 at 12:34 PM.
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Old Nov 6, 2008 | 12:48 PM
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The Diagnostic Port is under the Dash just to the right of the Steering Wheel.

That looks like the EVAP, I've never seen a '93 upclose to tell you for sure.
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Old Nov 6, 2008 | 06:32 PM
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I just routed the hose through without the Evap solenoid. I read somewhere on here that a resistor could be used to keep the CES light from lighting up, but the search seems to be down.

I am pulling codes- 26 (evap), 43 (knock sensor!?), 63(O2 sensor) and 66 (a/c pressure sensor?)
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