Turn the key no starter action but can bump start car
My problem is similar but has only happened twice. I turn the key and nothing happens, not clicks or anything (except the radio shutting down as is normal when turning the key to start). The first time was a few months ago. It's at the dealer's now but of course when they got it it started right up. So they haven't found the problem yet.
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Re: will not start
Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...
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It might possibly be the ignition switch, or the linkage to it.
They reason I suspect this is your statement, "I bumped the key forward and it will engage the starter but still wont shut off"
The part where you insert the key is really a "cylinder lock", that then transfers the turning motion to the actual "ignition switch"
My wife had a Pontiac (also a GM product) that the cylinder lock had a linkage that went to the ignition switch (similar to a sliding electric switch, with the 4 positions, ACC, OFF, RUN, START), which was bolted on further down the steering column, underneath the plastic covering on the column.
Another person here had a similar problem, and after suggesting this, he wrote back that he removed his steering column cover and found a screw opposite the cylinder lock that had loosened and fallen out.
So you could try removing the steering column cover and see if all is ok.
Also, when you have it opened up, observe the action as you turn the key, as the problem could be the cylinder lock itself.
There should be a starter relay under the hood in the fuse box, get someone to bump the key and listen for it to close the circuit. the description should say PCM/ECM/STARTER something along those lines. If it doesn't click you may want to swap it for another in the fuse panel and retry. Be sure to check the fuse for the start circuit. The starter circuit is control by a module so there is no direct wire from the ignition switch straight to the starter. If you hear it click then you may want to use a test light and check for voltage at the starter (small wire on solenoid) while someone else bumps the key.
Did you ever figure this out? I have a similar problem. There is a very light ticking sound when the key is in the on position but not being turned to start. In fact, nothing happens when turned to start now. It did at least click. The batter is good and everything electrical is working in the vehicle without dimming or anything. Jumping also did not change anything.
You may have a loose battery cable or a corroded one, clean as needed. Also listen if you hear a "click" noise from the starter, if so replace the starter the starter solenoid contacts are burnt. I have a 1996 C4 and have had this problem twice now in 80,000 miles, both times it was the starter solenoid (it is rebuild-able). You can buy a new on on eBay for cheap.
If when you turn the key to start and the solenoid wire (small wire) gets current, check and make sure you have a good ground. If you do the starter is bad. Replace the starter and your problem will be solved.
Possibly the alarm cut-off switch? or Ignition key switch (or wires) going bad?
But you mentioned you tried to jump start it and it did turn over?
IF so, you could have severe corrosion or loose connections of the battery cable both at the battery and at the termination points, such as ground and starter motor.
Check that the battery wires are tight and clean at the battery posts and at the other end.
Again the No lights suggests either the alarm cut-off, or an absolute disconnected battery cable.
Finally, it could be ignition fuse, Check fuses. Ignition key switch.
What makes this hard is that you suggest it would turn over with another battery connected. This makes no sense.
Next time it won't start turn headlights on and see if they dim when you turn key to start, if they dim its most likely starter, if they don't dim possible starter switch, Have you tried to start it in neutral position? Try that, if it starts in neutral than its park neutral switch, if not could be starter switch, Just make sure you chk. all fuses and any relays associated with ignition first.
Check terminals are all tight.Could be faulty starter motor, is it manual if so try bump starting it you need to check there is feed going down to starter solenoid when turning key to crank, if is could be worth giving it a tap with small hammer as may be sticking.