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In your car the engine starts this way: a code stored in the remote key is sent wirelessly to the receiver in the receptacle (thru its coil antenna) which sends it to the ECM to activate it; then the starter button sends the command for the actual starting.
In your case the receiver appears to keep the code in memory when it shouldn't. Have it replaced. BTW this has absolutely nothing to do with the ignition coil.
I have the same model and year Coupe, and have problems starting it sometimes. I'm not sure it's the same problem you're having, as you say nothing happens when you turn the ignition key. On mine the engine turns over but doesn't start. It usually happens if I've been driving, stopped and then tried to drive off again. In my case it's the ignition lead - to get it going I have to pop the bonnet/hood, pull apart the plugs that connect the two halves of the ignition lead together, then reconnect them. I'm guessing the plugs are just slightly loose and/or the contacts need cleaning (haven't gotten around to sorting it properly yet). Loose plugs would explain why it's okay until after I've been driving; presumably the plugs get shaken loose during the drive.
Might not be the same problem on yours but it might give you somewhere to start. Hope it's of some help!
You need to scan for codes to determine what is wrong. Even if the check engine light is not on, the Hummer's computer has stored whatever code(s) were thrown to cause it to illuminate. The only explanation for the key being stuck in the ignition on uneven surface would be if the steering wheel needed to be turned slightly to relieve pressure to completely turn the key to off to remove it. This would not be related to your apparent emissions problems in any way as far as I know. Most major parts stores will scan for codes for free, you need that info to proceed.
If disco is automatic move the transfer lever from high to low box and back again firmly then the key will come out there is a safety feature on the autos to prevent the key being removed if the transfer box is not in either high or low correctly with most dicso;s the transfer shift lever is stiff. through lack of use .once it is pushed in properly the key will release it works every time and I have had four v8 autos
basically you cant remove the key because even though the gearbox is in park if the transfer gears are not fully home the park sensor on the gearbox thinks it is out of gear eg not in park so wont let you remove the key and leave the car out of gear in case it rolls away .Dan
There are a few problems why this can happen. Most commonly there is a wire down by the bottom of the shifter that is broken. In the meantime, you can stick a small screwdriver through the hole under the steering column (you'll have to pull off the cover). This will push in the solenoid and allow you to remove the key. Your mechanic can diagnose the root problem.
Sounds like a fault in the ignition switch, or ( if the car is auto) the lock out on the shifter. First try wiggling the shifter . Else. Providing that the ignition lights are coming on. Wait for the fault to appear then hot wire the starter . Take a wire from the small terminal on the starter to a positive power feed. If the car starts, check starter relays, fuses, connections ( under footwell on the right side RHD cars) , make sure the connections are good on the starter. If all these things OK, then the actual ignition switch is most likely faulty.
There is a solenoid & plunger next to the ignition switch inside the steering column that stops functioning. The plunger must be retracted in order for the switch to turn all the way so the key can be removed. manually insert the plunger and take out the key.
Connections are the most common either on the battery or the starter solonoid. Next would be a starter, but you would usually get a click down on the flywheel where the starter engaged but could not turn over. Finally an ignition switch, unlikely but contacts there do sometimes go bad there as well.