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Old 03-28-2003, 01:09 PM   #1
TIMSPEED
 
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What is this solenoid on my TH350?

It's a little like solenoid looking thingy. It's on the passenger side, rear of the transmission. It faces the rear and it has a vacuum line going from it, up to the back of the intake manifold...last night when I was pulling my headers off, I noticed that the vacuum line was not connected! Maybe this is why my truck was idling so rough, and also wouldn't shift...what is that thing?
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Old 03-28-2003, 01:12 PM   #2
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Vacuum modulator
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1986 Chevy Silverado C-10 LWB
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Old 03-28-2003, 01:19 PM   #3
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Quote:
Vacuum Modulator
Which does...
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Old 03-28-2003, 01:22 PM   #4
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Quote:
Originally posted by TIMSPEED

Which does...
controls the shifting of your tranny.
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Old 03-28-2003, 01:24 PM   #5
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All I know about it is that it moves a valve in relation to manifold vacuum. I think it might control the throttle valve. It could cause the truck to idle rough if there is a vacuum leak. Don't know about your shifting problem though.
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1986 Chevy Silverado C-10 LWB
Gunmetal Grey Metallic
5.0L HO, 700-R4, '73 12-bolt rear
Long tube headers, 2.5" dual exhaust dumped before the axle.

1988 GMC Sierra SLE 4WD
5.7L, 700-R4, stock everything
6000LB winch
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Old 03-28-2003, 01:27 PM   #6
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Quote:
controls the shifting of your tranny.
DING DING DING!!! Ladies and Gentlemen, WE HAVE A WINNER! Sweet! Now, once I get my new headers (Free from Summit) on saturday, then sunday I'll put everything back together and take it out for a ride..maybe it'll shift into drive!
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Old 03-28-2003, 02:28 PM   #7
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Free headers!? How do you go about getting some of those.
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Old 03-28-2003, 03:06 PM   #8
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Quote:
Originally posted by BigRed
Free headers!? How do you go about getting some of those.
Actually, I bought a set of Smog Legal Headers from Summit for my truck in 01...and all this time, they've been the NON Smog Legal headers (Worth $120, instead of $260). So I called them up the other day, and they said they'd exchange them for the ones I originally paid for. (And you wouldn't BELIEVE how rusty these headers are!!) Now how's THAT for Customer Service?!?!
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