Starts but quits as soon as key returns to run position.
Starter stayed engaged and fried. New starter almost did same,ignition switch stuck. New ignition switch ,now starter operates normally BUT, engine starts right up, then quits as soon as ignition switch is returned to run posion. $400.00 so far ,What next?
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Re: Starts but quits as soon as key returns to run...
My bet is that you have an open the fuel pump run circuit or the vacuum switch. Most GMs have a vacuum switch to 'see' the engine running and reduce pressure by cutting voltage. However, if your car has a turbo or supercharger, they use a relay that 'flips' to a resistive line which then cuts the power level to the pump. Get a good model-specific diagram and check it out.
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The Starter motor can keep running because of a number of things. It receives its power from the large contacts (switch) in the starter solenoid. WHen engaged, this starter sol. allows high current 12 volts to run the starter motor.
A number of things can cause the starter solenoid to stay engaged:
A) stuck starter solenoid mechanicals. probably not the cause
B) more likely a defective start position on the ignition switch in the ignition switch
C) possibly a gummed up ignition key tumbler
I would start troubleshooting with a schematic. Make your own or purchase a service manual. IF you pull off the wire from the switch (in the center console) which actuates the starter solenoid, and the starter motor continues to run, then its not the switch or the key tumbler. its the solenoid.
Troubleshooting is the logical process of elimination.
First turn of the key energize the car electrical circuits for some circuits radio ets. 2nd turn of the key energize the the starting cycle, when you turn the key to the third spring loaded start mode it completes the circuit to the starter solenoid which engages the starter and start the car, the spring in ignition return the key to ignition on.
Maybe you have a malfunction in the ignition on position. Dont have a large bunch of keys hanging in your ignition, it sings back and forth when the car is in the start mode and cause havoc to your ignition switch.
check to engagement wire at the starter, make sure that power is only present when key is in the start position.if this is the case, then your sarter bendix is hanging up on the flywheel, this is caused by either inproper shiming where the starter is bolted to the block, or having the wrong bendix on the starter, there or several different bendix s general motors uses, also if the return spring in the solonoid is broken or not strong enough the starter could hang up. if the problem is power continuing to feed the solonoid with the key in the run position you could have a bad or out of adjustment ignition switch, since the power feeds the solonoid directly from the ignition switch, other than the neutral switch on the colomn
Without the key in the ignition............ Now thats a new one. Several things have to be energized to start the engine. If the car starts and runs then the ignition switch under the steering column is stuck in start position. If you mean the starter cranks but the engine does not start then 2 things could be causing that. The starter relay in the fuse box under the hood is stuck on or the starter itself has the solenoid stuck in the start position and has to be replaced.
Hello I have simular problem the ignition on is stuck in that position with the key turned off and out of the ignition switch.It feels like the key switch is spinning freely in the ignition. Do I need an ignition switch?
The click you hear is the starter relay. Check for continuity thru relay with battery negative cable disconnected and switch in start position. If no continuity, it probably has burned contacts. Sometimes these can be taken apart and contacts filed/sanded cleaned.