Engine tries to rev back up
Thread Starter
Instructor
Joined: Mar 2020
Posts: 167
Likes: 42
From: Virginia
Engine tries to rev back up
I have a 400 small block with a 750 demon carb. When I got it the guy said I would have to take it to have the carburetor tuned because he put it on and didn't mess with it. Sometimes, not always when I shut the car off about 1/4 later it will try to rev back to life for about 1/2 a second then shut off. Should I be really concerned about this or is it just the carb needing to be tuned?
Thread Starter
Instructor
Joined: Mar 2020
Posts: 167
Likes: 42
From: Virginia
Is "dieseling" going to damage the engine?
I use 93 Octane, it's what the guy told me to use.
I will have to get back to you on the idle speed, I honestly don't know what it is. I'm thinking it's around 800 but I'll let you know.
I use 93 Octane, it's what the guy told me to use.
I will have to get back to you on the idle speed, I honestly don't know what it is. I'm thinking it's around 800 but I'll let you know.
Race Director
Joined: Nov 2006
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From: Sunshine Coast, Queensland, Australia
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Cruise-In VIII Veteran
Running on, or dieseling is Not a good thing. Most commonly caused by incorrect timing. Incorrect idle speed and or idle mixture can also contribute.
As stated above. Your engine needs tuning. NOW.
As stated above. Your engine needs tuning. NOW.
