LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

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Old Jul 22, 2003 | 02:41 PM
  #1  
Green G0blin's Avatar
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Please Help Asap

http://csce.uark.edu/~jgbertr/rb/opti_vacuum_conn.jpg

on that pic there...there is pcv valve (to intake manifold port under throttle body)

well my car is hesitating and stumbling. and i noticed i had no pipe here...where does it lead to? and would this cause my problems?
Old Jul 22, 2003 | 02:46 PM
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Chris 96 WS6's Avatar
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The PCV tube connects back into the intake manifold at the front...underneath the throttle body.
Old Jul 22, 2003 | 02:50 PM
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yeah. i finally figuered it out..but would that cause my hesitation/stumbling? and cause the car to turn off?
Old Jul 22, 2003 | 05:19 PM
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Originally posted by Green G0blin
yeah. i finally figuered it out..but would that cause my hesitation/stumbling? and cause the car to turn off?
How many miles do you have on your car?

What mods have you done to:

The engine?

The exhaust?

Any changes to any valves?

Are the IAC/EGR valves factory, or have you replaced them recently?

How many miles do your plugs/wires/coil/cat/fuel filter/Opti/waterpump/O2 sensors have?

Have you had it scoped yet?
Old Jul 23, 2003 | 08:39 AM
  #5  
Green G0blin's Avatar
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miles: 75,000

year: 1996

mods: lt4 hot cam, ported/polished lt1 heads, stall, gears,
suspension, jet hot long tube headers, true duals.

engine: 5.7 lt1

exhaust: long tube headers, x pipe, true duals

no changes to the valves.

IAC factory, egr removed.

about 30 miles on: plugs, wires, 02 sensors, fuel filter

oringial opti, coil and water pump.

and no cats.
Old Jul 23, 2003 | 05:56 PM
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Unhappy

TTT
Old Jul 23, 2003 | 06:44 PM
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From: Cypress, Orange County CA.
Originally posted by Green G0blin
miles: 75,000

year: 1996

mods: lt4 hot cam, ported/polished lt1 heads, stall, gears,
suspension, jet hot long tube headers, true duals.

engine: 5.7 lt1

exhaust: long tube headers, x pipe, true duals

no changes to the valves.

IAC factory, egr removed.

about 30 miles on: plugs, wires, 02 sensors, fuel filter

oringial opti, coil and water pump.

and no cats.
It could be a couple of things, maybe getting it dyno-tuned, that may help with the hesitation, getting the fuel/air mixture would be a great thing to dial in. Also, have you ever cleaned out the TB/IAC valve assembly? That would probably help, it CERTAINLY wouldn't hurt.
Changing the plugs/wires once a year wouldn't hurt either
Now was that 30 miles or 30K miles?

It MIGHT be the Opti going out on you.

Have you scanned for codes?
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