Ignition key springs back to off postion??

cw41

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#1
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MAKE:chev
MODEL:Impala
YEAR:2000
MILES:129000
ENGINE:3.8
DESCRIBE ISSUE....My daughters impala would not start for her. First thing I thought of was no fuel pressure but after hooking up the pressure gauge and turning the key on, the key springs back to the off position. You can hold the key in start and car runs fine but as soon as you let go of the key, it springs back to off. Never run into this before with a key springing back. the key will insert and remove ok. Also you can shift out of park and into all shift positions. The ignition key tumbler and theft deturent module was replaced. This is the type that the key is in the dash model.
I was told there was a shift interlock solonoid underneath the shifter console but I;m not having shift issues.
Any help again is appreciated. thank you
 
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#2
Sounds this may apply "unintended key rotation..... RECALL 14350C" . I think there is more to this.

Sorry I cannot get specifics - a better description, serial numbers etc
talk with a authorized Chevy dealer....
 

cw41

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#3
thank you, I had put an aftermarket key and module in a few years ago so the key recall probably wouldnt apply to this??
 

nickb2

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#4
I am assuming this procedure wasn't followed properly and maybe some filings were left in there and have worn out the release detente/button.

My advice is get a new ignition switch lock cylinder along with a new tumbler. The actual ignition switch is probably fine, but the lock cylinder and pairing tumbler probably is worn out to the point that the start back to run spring overcomes the wear and tear and simply slips back telling the car to shut off.

Here are a few snapshots of what is probably wrong and there is really no fix for this apart from replacing the whole unit. Later on, I will tell you how to bypass the whole antitheft system so you don't have to go to a dealer. Screenshot (81).png Screenshot (82).png
 

cw41

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#7
thanks again nickb2, I figured that something must have gone bad the key assembly and module is only 3 years old but aftermarket. What brand would you suggest using? Should I replace the theft module along with the key assembly? thank you
 

cw41

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#8
When I did it I did the relearning procedure instructions I didnt have to go to the shop. seems like you leave the key on 15 min then off and back on twice more for 15 min and it relearns.
 

nickb2

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#9
Actually, the bypass I use is like any other guy on the net, I just insert a resistor on the yellow wire. One 30 relearn procedure and the theft module will reconcile any thing after that. That is until you replace another module.

But that is not your case. Your best bet is to try e-bay for a whole new key lock cylinder tumbler and key kit.

Something like this should be very ok for the life left in this car.

http://www.ebay.com/itm/Replacement...Keys-NEW-for-Chevy-Olds-Pontiac-/310574689540

No need for OEM here.

But that is my $.02
 

cw41

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#11
thank you very much nick thats the one I'll buy. Hows the weather up there? It was 107 in the shade here yesterday and humid.
 

cw41

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#12
We'll call this one 'fixed'! It was a faulty ignition switch. Back on the road again, the relearning took a bit longer than it should but the car finally accepted it. thanks for all the help and comments.