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"Dieseling" on shut down

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Old May 28, 2005 | 06:08 PM
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Default "Dieseling" on shut down

When I shut down my '75, it "diesels" or fires a few times after I have turned the key off. When I shut it off, the RPM's are high (between 1500-2000RPM). Recently my temperature guage quit working and I'm wondering it there might be something wrong with my water temperature that could relate to my high idle RPM's and "dieseling."
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Old May 28, 2005 | 06:15 PM
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why does your car idle so high? fix that problem and your other problem should go away .check for vaccume leaks.
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Old May 28, 2005 | 06:16 PM
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Originally Posted by VolVette
When I shut down my '75, it "diesels" or fires a few times after I have turned the key off.
My 78 had the same problem for a week and then it stopped doing it
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Old May 28, 2005 | 06:47 PM
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Originally Posted by VolVette
When I shut down my '75, it "diesels" or fires a few times after I have turned the key off. When I shut it off, the RPM's are high (between 1500-2000RPM). Recently my temperature guage quit working and I'm wondering it there might be something wrong with my water temperature that could relate to my high idle RPM's and "dieseling."
Why are you shutting it down with your foot still on the accelerator? If you're not doing that there is something wrong with the ignition, carburetor or both. Is the timing set right? Retarded timing will force you to raise the idle speed on the carburetor to keep the engine running. Is the choke adjusted correctly? Are there any vacuum leaks?

BigBlockk

Later.....
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Old May 28, 2005 | 07:01 PM
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drop the idle down.
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Old May 28, 2005 | 07:30 PM
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turn it of in gear until yu fix it...
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Old May 28, 2005 | 10:18 PM
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Originally Posted by bobs77vet
turn it of in gear until yu fix it...
I should have mentioned that it's an automatic.
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Old May 28, 2005 | 10:22 PM
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Originally Posted by VolVette
I should have mentioned that it's an automatic.
even better turn it off in gear....just turn it off in drive or reverse , no problem
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Old May 28, 2005 | 10:38 PM
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Originally Posted by bobs77vet
even better turn it off in gear....just turn it off in drive or reverse , no problem
Is this just so the RPM's are lower? Or what's the idea behind doing that?
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Old May 28, 2005 | 10:48 PM
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
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Originally Posted by VolVette
Is this just so the RPM's are lower? Or what's the idea behind doing that?
the cars stalls and can't run on, it is not the solution but stops the embarassment
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Old May 29, 2005 | 05:28 PM
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I have the same problem with my 79' bronco due to higher compression, and reg gas. If I run midgrade tho, it never diesels.
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Old May 29, 2005 | 05:35 PM
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Originally Posted by VolVette
Is this just so the RPM's are lower? Or what's the idea behind doing that?
the engine stops. i learned this in 1970 with a 70 duster(i left it kickin', when i came back 10 min later, it was still kickin'[company car )
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Old May 29, 2005 | 05:47 PM
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You should get your idle down below 1000 RPM.

You could also add an idle solenoid so the air is blocked when you shut down.
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Old May 29, 2005 | 09:38 PM
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
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Originally Posted by Matt Gruber
the engine stops. i learned this in 1970 with a 70 duster(i left it kickin', when i came back 10 min later, it was still kickin'[company car )
i was just thinking the same thing....any body who drove cars in the early -mid 70s learned that trick.
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Old May 30, 2005 | 09:18 PM
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Since I started using a fuel additive called Max Lead 2000 on the recommendation of another CF member, it cut down the dieseling. Also gets rid of the major fumes and gives you some more power as well. You can buy it direct from the mfr., which you can find on the web if you do search on the name of the product.
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Old May 30, 2005 | 11:56 PM
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Originally Posted by jpw73vert
Since I started using a fuel additive called Max Lead 2000 on the recommendation of another CF member, it cut down the dieseling. Also gets rid of the major fumes and gives you some more power as well. You can buy it direct from the mfr., which you can find on the web if you do search on the name of the product.
if engine's been running rich for a long time you may have excessive carbonization in the cylinders which raises compression ratio and can cause dieseling problems.
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Old May 31, 2005 | 12:24 PM
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I had a similar problem on 87 octane.. I stepped up and the issue is gone
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