So I've had this problem getting my car to idle smoothly. I can get it to idle, but not very smoothly. Also, the car sometimes dies during hard braking. Application of the brake pedal can occasionally cause the rpm to drop very low, but it usually comes back up before the engine dies. I don't think the booster leaks air, as there's no suction noise, and the idle stabilizes after a second.
Disconnecting the idle solenoid on my carb does not affect the idle speed. I read in the manual that the solenoid is controlled by a tachimetric switch that energizes it under 2600 rpm. My tach is currently disconnected. Would disconnecting the tach disable the Idle Solenoid circuit?
Tach/ Idle Solenoid Linked?
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manoa matt
- Posts: 3442
- Joined: Thu Oct 26, 2006 4:28 pm
- Your car is a: 1978 Fiat 124 Spider 1800
- Location: Honolulu, Hawaii
If you disconnect the idle solenoid the car should shut off. The idle solenoid is energized when you put the key in the ignition and turn on the electric.
Try this: Disconnect the idle solenoid wire. Put the key in and turn the electric on. Go to the engine and hook up the wire, you should hear a click.
Aside from the idle solenoid electronics going bad there is another posible problem that can happen to the idle solenoid.
Remove the idle solenoid and check the small brass jet at the end. It should be conical in shape and uniform. If one side appears worn then fuel can leak past the jet and cause a rough idle.
Hopefully you have the smaller diameter idle solenoid. The jets are avilable for about $5. If you have the larger solenoid then you have to buy the whole thing.
On a 78 the solenoid should only have one wire going to it. If you have two wires that are crimped into a single connector then it is wired up wrong. Not shure about the 79
Matt
Try this: Disconnect the idle solenoid wire. Put the key in and turn the electric on. Go to the engine and hook up the wire, you should hear a click.
Aside from the idle solenoid electronics going bad there is another posible problem that can happen to the idle solenoid.
Remove the idle solenoid and check the small brass jet at the end. It should be conical in shape and uniform. If one side appears worn then fuel can leak past the jet and cause a rough idle.
Hopefully you have the smaller diameter idle solenoid. The jets are avilable for about $5. If you have the larger solenoid then you have to buy the whole thing.
On a 78 the solenoid should only have one wire going to it. If you have two wires that are crimped into a single connector then it is wired up wrong. Not shure about the 79
Matt
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mdrburchette
- Posts: 5754
- Joined: Wed Jan 25, 2006 5:49 am
- Your car is a: 1972 Fiat 124 Sport
- Location: Winston-Salem, NC
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HOLLYWOODSPIDER
My main question is " are the idle solenoid and the tach linked?" I.e., am I going to be able to get it to idle smoothly without replacing the tach? Is this "tachimetric switch" mentioned in the manual text actually inside the tach? Connecting/disconnecting the solenoid produces no results. Carb is adjusted to idle without the help of the solenoid, thus it is idling without the help of the idle circuit.
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So Cal Mark