diluded000 Posted June 16, 2005 Share Posted June 16, 2005 This was originally posted as mystery wire and received some helpful responses from MorganM, but I have a more specific question now, and . . . get this: I figgured out that I do indeed have a Hitachi carb and not SPFI as I originally thought. RTFM After looking at my Haynes book I found a picture of both carbs, SPFI, and MPFI and located my idle air control solenoid on the picture of the Hitachi. Now the picture of the carb shows both leads from the solenoid going to a single connector, and the engine wiring diagram doesn't show any idle air control solenoids. So I am still stumped. What I have going on is a single red wire coming off this solenoid that is hanging loose. The black wire from the solenoid goes to a rectangular connector that has two vertical pins with a third pin horizontal over the other two. All three pins on this connector have wires run to them. The other side of the connector has a couple of black wires with white stripes, and I am guessing runs up to the ECU or a relay somewhere. But I am still stumped as to where the red wire coming from the solenoid attaches. If anybody has an 85 Hitachi EA82 and could look or knows off hand, it would be a huge help. The good news is I did my transmission swap, got the motor back in the car, and started it last night. This is the first time I ever pulled a motor out of anything besides a laser printer, so I was pretty fired up. It was pretty dang loud without the exhaust pipe hooked up. Hopefully tonite I can get the CVs attached to the transmission (any tips?) and get the linkage working at an unnatural angle from the lift. - James B Link to comment Share on other sites More sharing options...
diluded000 Posted June 22, 2005 Author Share Posted June 22, 2005 bump (if anybody could look at their Hitachi and see where this wire goes it would be vastly appreciated) This was originally posted as mystery wire and received some helpful responses from MorganM, but I have a more specific question now, and . . . get this: I figgured out that I do indeed have a Hitachi carb and not SPFI as I originally thought. RTFM After looking at my Haynes book I found a picture of both carbs, SPFI, and MPFI and located my idle air control solenoid on the picture of the Hitachi. Now the picture of the carb shows both leads from the solenoid going to a single connector, and the engine wiring diagram doesn't show any idle air control solenoids. So I am still stumped. What I have going on is a single red wire coming off this solenoid that is hanging loose. The black wire from the solenoid goes to a rectangular connector that has two vertical pins with a third pin horizontal over the other two. All three pins on this connector have wires run to them. The other side of the connector has a couple of black wires with white stripes, and I am guessing runs up to the ECU or a relay somewhere. But I am still stumped as to where the red wire coming from the solenoid attaches. If anybody has an 85 Hitachi EA82 and could look or knows off hand, it would be a huge help. The good news is I did my transmission swap, got the motor back in the car, and started it last night. This is the first time I ever pulled a motor out of anything besides a laser printer, so I was pretty fired up. It was pretty dang loud without the exhaust pipe hooked up. Hopefully tonite I can get the CVs attached to the transmission (any tips?) and get the linkage working at an unnatural angle from the lift. - James B Link to comment Share on other sites More sharing options...
NorthWet Posted June 22, 2005 Share Posted June 22, 2005 My 86 FSM does not show any Idle Air Control Solenoid for a carbureted vehicle, at least as far as I can tell. And all of mine are EFI, so can't look. If I get more info I might be able to figure it out. Otherwise, another bump. Link to comment Share on other sites More sharing options...
yorab Posted June 22, 2005 Share Posted June 22, 2005 I'm no expert, but I've learned quite alot about my 86 EA82 the hard way. Haynes sucks when it comes to carb issues. I had carb problems, so I bought a Mitchell repair CD. It was better, but still not great. I finally found a FSM. Thats what you need to do. Anyway, back to your problem. On my '86 Hitachi, there is only one solenoid. It is not an Idle solenoid. It is the Fuel Chamber Ventilation solenoid. The valve mounts to the intake manifold just beside the carb on the driver's side. Electrically, the valve is connected to a two pin connector and is actuated when the thermoswitch just below it reaches a temp of 153 F. Manifold vacuum is routed to the FCV solenoid. When the valve is actuated, vacuum is routed to the bowl vent valve and air control valve. This opens the fuel bowl and main and slow carb passages to atmosphere. If this sounds like the component that you are referring to, let me know and I will trace the wiring for you. Link to comment Share on other sites More sharing options...
diluded000 Posted June 23, 2005 Author Share Posted June 23, 2005 Thanks for the replies. I put a picture of what I am talking about below. It is hard to see, but there is a round thing with wires comming off it coming out of the passenger side of the carb when looking under the hood from the front. Link to comment Share on other sites More sharing options...
yorab Posted June 23, 2005 Share Posted June 23, 2005 That is the anti-dieseling solenoid. It cuts off fuel when the ignition is switched off. The wire runs around the front of the carb and connects into the three pin connector that you wrote about. The three pins are for 1) anti-dieseling solenoid 2) bowl vent solenoid which is the round soleniod on the top driver's side of the carb and is visible in your pic 3) choke heater. Take your air cleaner off so you can see what's going on. If you've never taken it off, it seems like quite a job just for an air cleaner, but you get very quick at it. Label all hoses until you learn where they go. Now is a good time to check the components. Put 12V from battery onto the wires that run to each off the soleniods. Listen for an audible 'click'. Pull 12v off then try again a few more times. If clicking, soleniods good. Also put 12V on the wire that runs around the back side of the carb that runs to the choke heater and leave it on for a minute or two. Feel the choke housing with your hand to find out if it is heating up. The three wires to these components run into a connector which connects into the engine wiring harness. Link to comment Share on other sites More sharing options...
yorab Posted June 23, 2005 Share Posted June 23, 2005 One more thing. It looks like the red wire is aftermarket. I'm thinking that there may have been a problem with the circuit that powers the anti-dieseling soleniod and somebody ran that power wire directly to 12V. The engine will not idle if the a.d.s. does not have power. There is a fuse in the fusebox that protects that circuit. Check to see if it didn't blow. On my 86, it was labeled "engine meter". I blew that fuse once while learning what everything was. Once you have the wires into the connector (you may have to crimp a male spade connector to wire before sliding it into the 3 pin connector), mate the two connectors. Have somebody turn the ignition switch to run (don't start) and you should hear that audible click from the two soleniods that you heard when you put 12V on them. Link to comment Share on other sites More sharing options...
diluded000 Posted June 23, 2005 Author Share Posted June 23, 2005 Thanks for the info. Being a red wire I suspected it was run to 12v with the circuit closed by an ECU transistor to ground, but didn't want to fry anything testing this theory. Randomly hooking loose wires up to 12v could unleash more electrical gremlins and let some smoke out of things . IIRC my wiring diagram shows 12v run to the black w/white stripe wire on the opposite side of the three prong connector, so I can hopefully just piggyback onto one of those and get my throttle adusted a little better. After I put the motor back in with the new (to me) D/R transmission - it runs, but it is idiling poorly at about 4K RPM. When I backed it out of the garage for the fitst time in 4W-lo, well lets just say it got going a little faster than I was expecting. thanks again - James B Link to comment Share on other sites More sharing options...
diluded000 Posted June 27, 2005 Author Share Posted June 27, 2005 The red wire goes to ground. Without it connected the RPMs would surge about every 2 seconds, but when the red lead is connected to ground everything get smooth. I adjusted the throttle cable after I connected the solenoid and it is back to running just like before I pulled the motor (tick tick tick drip drip). Now I have something to drive while I pull the dash out of my Nissan to get to the A/C guts. Hopefully that will go quick and this weekend I will be able to pull a turbo motor (or two). Thanks. - James B Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now