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Necoa #: 716
Location: 13(TX)
Joined: Mar 18, 2003
Posts: 194
Year: 1985
Model: El Camino
Posted: Sat Oct 20, 2007 9:39 pm Post subject: '85 AC idle speed solenoid - no voltage when AC is on
'85 with 305. With key in run position, engine not running, AC on or off, I have 12Volts at idle speed solenoid connector. With the engine running and AC on or off, I have 0 volts. I am not sure why I would have the 12V when the key is in the run position, engine not running and the AC is off? The AC compressor cycles normally. Ideas welcome.
Thanks
Robby
Check the fast idle relay. It's located on the passenger side, next to the radiator overflow bottle. The Delco part number is 14078924. It has a five pin connector. I bought a new one at a Chevy dealer. This part is probably used on quite a few GM vehicles....Doug _________________ 85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
Lakewood, CO
You do not need to have the AC on to have the Idle Stop Solenoid energized. The Idle Stop Solenoid can be energized two ways. One way is, when the Fast Idle Relay is de-energized and the AC is turned to Normal or MAX. The second way is if the Fast Idle Relay is energized by the Electronic Control Module (ECM). _________________ Ernie
87 El Camino
"To be Old and Wise, you must first be Young and Stupid"
Necoa #: 716
Location: 13(TX)
Joined: Mar 18, 2003
Posts: 194
Year: 1985
Model: El Camino
Posted: Sun Oct 21, 2007 5:10 pm Post subject:
Ernie,
Thanks for replying to my post on the 1985 AC idle speed control issue. Is there an easy way to check the fast idle relay? I looked at the schematics we have on the site but they don't show the relay circuit. Hoping you might have the diagram or advice on checking the relay. And can I assume that the relay works as a switch - activating the relay from either the ECM or the AC switch.
Connect a wire from the battery to the connector on the fast idle solenoid with the engine running and the AC on. If it activates then you can be pretty sure your relay is bad.....Doug _________________ 85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
Lakewood, CO
Necoa #: 716
Location: 13(TX)
Joined: Mar 18, 2003
Posts: 194
Year: 1985
Model: El Camino
Posted: Sun Aug 31, 2008 7:36 pm Post subject:
Just a followup to my original thread that my problem was the Fast idle Relay. (it was sticking). Thanks to all who replied. _________________ 77 HD Sportster
79 Corvette L82
85 El Camino SS LG4
93 Camaro Z28 LT1
05 Dodge Caravan daily driver - yeah baby!
Necoa #: 4709
Location: 4(MD,VA)
Joined: Jan 22, 2005
Posts: 32
Year: 1984
Model: El Camino
Posted: Sat Sep 27, 2008 7:09 am Post subject: IDLE SOLENOID RELAY
YOU GUYS ARE GOOD ! I CAN NOW FIX MY 84SS EL-C AND WON'T HAVE TO TURN THE AC OFF AT LIGHTS TO SLOW DOWN THE IDLE AND BEFORE I TURN THE ENGINE OFF TO KEEP IT FROM "RUNNING ON". . . . LIKE I DO ! BARRY-MARYLAND _________________ 84 El Camino
75 T-160V Triumph MC
95 F-150
09 Toyota Yaris grocery getter
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