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Old 07-23-2005, 07:46 PM
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Engine Runs After Key is off?

Okay. This car is giving me nothing but trouble when I got the tags for it. Just recently the car is now running when I turn it off. But it only happens maybe once a day. I can turn it off pull the key out and everything, then it slowly cuts out. I really don't know whats going on. Any Ideas? I just posted a thread on the engine thing about a really bad tap/knock could this be related or is it just stright electrical? Well thanks ahead of time

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Old 07-23-2005, 07:53 PM
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It's not electrical..................probably needs a good tuneup.

Maybe has vacuum leaks, or carb needs rebuilt.
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Old 07-23-2005, 08:04 PM
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could be electrical

Sometimes the alternator can back feed and supply power to the ignition. You can get a diode and solder inline to the brown wire going to the alternator.
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Old 07-23-2005, 10:32 PM
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I doubt it's electrical as well. You most likely have the timing advanced too far (also explains your knock/tap condition) creating a run-on or "dieseling" condition. If it continues to idle smooth when the ignition is off then it's electrical. If it runs on rough then you just need a tune up, search the knowledge base or the engine forum for all the info on why it "diesels".
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Old 07-23-2005, 10:37 PM
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Yes it sounds like the timing is not correct..
But do you know what has been done to the engine??
You might need some good old Gas with octane especially if there has been an engine swap with an older version engine
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Old 07-24-2005, 07:18 AM
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well theres no way in hell it needs a tune up 2 months ago(30 miles) I just put full Accel Cap, rotor, coil, wires, and Bosch Plugs. It has a brand new Holley Street Avenger(same exact age). but I had to yank the distributor when I changed the intake. and also when i changed the trans the motor leaned back real far and the distributor hit the firewall. well let me go check my timing, I'll let you guys know from there.
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Old 07-24-2005, 07:50 AM
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1......If you have a electric fan wired into the car and didn't use a relay to control it that will defiantly make your car keep running till the fan stops turning. That fan motor will generate enough power to back feed into the cars ignition wiring to power the system and keep it running.2........ If your engine is dieseling making chugging knocking noises after you shut it off. Then the Idle is too high after the engine is turned off enough air can be sucked into the engine to keep running esp with older engines that have alot of carbon build up in the cylinders air and fuel combined with those hot spots in the cylinders will keep it chugging and knocking and turning for Ive seen almost a minute.

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Old 07-24-2005, 08:00 AM
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Please don't get upset we're just trying to help!

You said you were going to check your timing again, that is a good first step. While you are at it just make sure that the bolt that holds the distributor down is nice and tight. Easy thing to forget to do, and I have before.

Also make sure your timing isn't jumping around. Once my brother and I got done tuning his engine. Ran great for a week then ran-on or dieseled every time he shut it off. Checked the timing and sure enough it had advanced about 15 degrees and it now would 'flutter' back and forth about 3-4 degrees as it ran, we could watch it with a timing light. We were stumped as the distributor was locked down fine. We got our answer about a week later when the car suddenly stalled and wouldn't start. Timing chain broke(amazingly it didn't take any valve with it!). So just make sure that the timing is steady and were you had set it before.
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Old 07-24-2005, 08:03 AM
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Someone needs to explain to me how timing being out of adjustment will make an engine keep running
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Old 07-24-2005, 08:46 AM
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Mind boggling question isn't it? I'll admit it took me having a real world problem to figure it out.

There are actually 2 ways: 1.) The timing can be so far off that there is excessive carbon build up. The build up gets red hot and ignites the compressed air/fuel mixture. 2.) it is a sign that your timing chain is misaligned, changing the timing of the camshaft.

My brother's Buick had the #2 problem, and would keep running for up to 30 seconds before it would finally quit.
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Old 07-24-2005, 09:16 AM
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A engine needs air, ignition and fuel to run. The only way it can run with the ignition off is if the idle is set too high in combination with hot spots in the combustion chamber. If the idle is set normal theres no way it can run on, it doesn't matter where the timing is. If the timing is to spec and the idle is high and there are hot spots the engine will run on. Im just saying in my 20+ year exp working on cars 50+ hours a week I haven't seen 1 case where the timing alone caused a run on cond.
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Old 07-24-2005, 09:36 AM
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sorry guys I"m just getting frustrated now because it's taken me a year to finally finish this car and get it on the road and now I've just been told by 2 mechanics that the knocking and loss of oil pressure is because of rod and main bearings which means I have a bunch of **** I need to get together and now I have no car to drive . Anyone know prices of a shop to do those? I don't feel like doing that myself at all.
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