1994 Chevy S-10 intake manifold tuning control valve

Tiny
JMICHAEL8888
  • MEMBER
  • 1994 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 165,000 MILES
What is the intake manifold tuning control valve on top of the plenum? Maybe called an intake runner control valve. And. How do I test it? It is not in the manual.
Do you
have the same problem?
Yes
No
Saturday, December 6th, 2008 AT 5:53 PM

7 Replies

Tiny
DOCFIXIT
  • EXPERT
Would like to help but have no idea what you are asking. Could you send pics? Elaborate?
Was this
answer
helpful?
Yes
No
+1
Sunday, December 7th, 2008 AT 3:09 PM
Tiny
JMICHAEL8888
  • MEMBER
Never mind I found it in the manual, under the fuel section. It controls air flow during certain rpm ranges controlled by the pcm. Thanks though.
Was this
answer
helpful?
Yes
No
Sunday, December 7th, 2008 AT 3:44 PM
Tiny
DOCFIXIT
  • EXPERT
The idle speed control motor
Was this
answer
helpful?
Yes
No
Sunday, December 7th, 2008 AT 4:03 PM
Tiny
JMICHAEL8888
  • MEMBER
The idle air control valve controls the idle through air flow into the intake regulated by a pintle, set through the pcm by the calculation of other sensors. The manifold tuning valve, on I believe 94 and 95 models, controls the passage way of air into the valves depending on speed and rpm.
Was this
answer
helpful?
Yes
No
+2
Sunday, December 7th, 2008 AT 4:46 PM
Tiny
DOCFIXIT
  • EXPERT
Found it no testing info will do some searching
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 7:34 AM
Tiny
DOCFIXIT
  • EXPERT
Not much on this short lived and zero testing info.
All I got from GM is that a TECH 1 special to GM dealers can read VTCS. Found wiring for relay and solenoid may help.
Relay is either on left or right side firewall on a bracket. Has 4 wires term A pink/blk 12v
term C dkgrn/wht grounded by PCM to close relay and apply volt to VTCS
term D pink/blk 12V
Brn/wht 12v when relay is closed. This wire goes to VTCS which is grounded G117 right rear cylinder head.
Ohm checking and voltage checks will verify if relay and solenoid are operable. And no signal from PCM on C would mean? Either PCM has not reseived info or is faulty. Must be operated by MAP and VSS so if MAP is not signaling vac change in manifold in relation to TPS and vehicle speed may not operate.
That's all I could find hope it helps
Was this
answer
helpful?
Yes
No
Monday, December 8th, 2008 AT 3:40 PM
Tiny
JMICHAEL8888
  • MEMBER
Yeah man thanks for the info. My map sensor at idle is 3.8v. Its supposed to be 1 to 1.5 v at idle. I think its telling my computer I have low vacuum. My vacuum is a steady 18.5psi.
The only info I got about testing the manifold tuning valve was to check for voltage with the engine running and to remove it and check for proper valve operation.
Thanks for the wiring info, my wiring diagram has only two wires to it. But you are right there are four.
Was this
answer
helpful?
Yes
No
+1
Monday, December 8th, 2008 AT 4:41 PM

Please login or register to post a reply.

Recommended Guides