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Author Topic: gas engine deiseling??  (Read 5400 times)

Offline dirtmod0

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gas engine deiseling??
« on: April 23, 2009, 06:37:08 pm »
Engine is a Vortec 350 with alum. Edelbrock intake and a Carter 650 electric choke carb. Every once in a while it it will diesel on me, very annoying. I have intial timing at about 18 degress and 32 at 3000 rpms. I run 87 octane maybe should run 89 or more? spark plugs are 44 long reach AC Delco r44lts.

What are your suggestions, I checked to see if carb was leaking after shutting off but didnt see anything.
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Offline TexasRed

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Re: gas engine deiseling??
« Reply #1 on: April 23, 2009, 07:55:00 pm »
What's the idle speed and is the choke operating correctly?
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Offline exilous

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Re: gas engine deiseling??
« Reply #2 on: April 23, 2009, 08:59:36 pm »
does it diesel for an extended period of time after shut off? or is it just a quick half second burst?
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Offline VileZambonie

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Re: gas engine deiseling??
« Reply #3 on: April 23, 2009, 09:49:49 pm »
Check your idle speed first.
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Offline dirtmod0

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Re: gas engine deiseling??
« Reply #4 on: April 24, 2009, 05:33:42 am »
I will check dont have a tach. now that u mention it it seems to idle up sometimes and after putting in park after engine is warm, what would cause this? before I leave for work this morning I will tweak the choke a bit and see what happens.
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Offline VileZambonie

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Re: gas engine deiseling??
« Reply #5 on: April 24, 2009, 07:21:29 am »
Make sure it's completely off of the fast idle cam when the choke is open.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline gold84gmc

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Re: gas engine deiseling??
« Reply #6 on: April 24, 2009, 07:26:10 am »
my engine used to do that....so i lowered the idle and now it doesnt do it anymore so i would check that
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92 buick century custom 3.3L

Offline dirtmod0

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Re: gas engine deiseling??
« Reply #7 on: April 25, 2009, 06:08:47 am »
I am thinking its getting stuck on the fast idle cam, I am gonna turn it a bit and maybe put a little grease on it to let it slide easier.
Thanks guys!
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Offline VileZambonie

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Re: gas engine deiseling??
« Reply #8 on: April 25, 2009, 07:53:07 am »
Make sure the choke is opening all the way and the fast idle screw is set properly.
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                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
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