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04-08-2012, 09:44 PM | #1 |
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'71 C10 Fast Idle Solenoid
On the right side of this picture is what I know as a fast idle solenoid. I know that when its plugged in it works, but it never shuts off to allow normal idle. I also noticed that there are two vacuum ports on the side of it that are not connected. Does anyone know how these are supposed to operate? Or is it not worth my time to mess with it?
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB |
04-08-2012, 10:43 PM | #2 |
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Re: '71 C10 Fast Idle Solenoid
I think its the TCS solenoid, most remove it as it's not used/needed.
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. |
04-10-2012, 01:55 AM | #3 |
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Re: '71 C10 Fast Idle Solenoid
Ok. I dont think its worth trying to make it work right, but thought maybe somebody would have some insight on it.
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB |
04-10-2012, 10:09 AM | #4 |
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Re: '71 C10 Fast Idle Solenoid
I always thought it was an anti dieseling solenoid that completely closes the primary throttle plates when the engine is shut down.
I actually re-wired mine to the A/C switch so it will slightly bump the idle up only when the air is on. Since you don't have A/C, it wouldn't hurt to remove it. |
04-10-2012, 06:03 PM | #5 |
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Re: '71 C10 Fast Idle Solenoid
^^^ I agree. if you want to run it, set your idle speed with it hooked up.
The fast idle solenoid can be hooked up to increase rpm when a/c compressor is on or used for anti-dieseling |
04-10-2012, 07:29 PM | #6 | |
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Re: '71 C10 Fast Idle Solenoid
Quote:
The lower vacuum port connects to manifold vacuum and the upper port connects to the vacuum advance on the distributor. One of the electrical connections connects to the water temp. switch which is wired through a 15 second time delay relay and the other connection is wired to the transmission switch and is wired to a reversing relay. According to the service manual if the C.E.C. does not function it will result in no vacuum advance and no high gear deceleration position of the carb. Again I urge any one who owns one of these trucks to purchase the factory service manual...it is an invaluable tool to help one figure things out. |
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04-10-2012, 10:56 PM | #7 | |
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Re: '71 C10 Fast Idle Solenoid
Quote:
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. |
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04-11-2012, 09:46 AM | #8 |
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Re: '71 C10 Fast Idle Solenoid
lol
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04-11-2012, 09:56 AM | #9 | |
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Re: '71 C10 Fast Idle Solenoid
Quote:
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