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Author Topic: diesels at shutdown  (Read 4636 times)

Offline Thermal Izod

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diesels at shutdown
« on: March 12, 2009, 02:13:41 am »
i'm noticing this, only in warm weather lately.....when i shut off, i get occassional dieseling/knocking for a second.....anyone have any ideas why?

it's an 82 k10, 305, 4bbl QJ, mild cam, headers/exhaust....
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1982 Shortbed K10 Silverado.  305 ci with a mild cam, full true dual exhaust (Long tube headers, "H" pipe, and Thrush Turbo mufflers.  4x4, and otherwise completely stock.  about 153,000 miles.

Offline Prong

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Re: diesels at shutdown
« Reply #1 on: March 12, 2009, 04:39:09 am »
Idle speed too high or a too low grade of octane in your gas.
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79 K10 SB 4x4 383/Th350
79 K10 LB 4x4 350/SM465

Offline Thermal Izod

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Re: diesels at shutdown
« Reply #2 on: March 12, 2009, 04:54:31 am »
i'm thinking the idle could be it.  i've had issues with that since i bought the truck.  i don't have a tach on it, so i adjust by ear, which is hard.  the motor has a decent bog effect when it's in vs, out of gear, and the idle seems to be inconsistant.  where the screw is now is the best i've had it, it doesn't ever stall, however at times it seems to idle up too high.  does anyone have any advice on how to fine tune this?  seems that if i bring it down, which at times could help, i will lose drivability at other times when it wants to idle lower...
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1982 Shortbed K10 Silverado.  305 ci with a mild cam, full true dual exhaust (Long tube headers, "H" pipe, and Thrush Turbo mufflers.  4x4, and otherwise completely stock.  about 153,000 miles.

Offline VileZambonie

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Re: diesels at shutdown
« Reply #3 on: March 12, 2009, 10:27:31 am »
Make sure the choke is fully opening and the idle speed is correct. Check your timing also.
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Offline eventhorizon66

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Re: diesels at shutdown
« Reply #4 on: March 12, 2009, 11:33:43 am »
I had an issue with dieseling with my old 305.  The choke was occasionally sticking.
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'85 C10 SWB 350 700R4 TKO600

Offline Thermal Izod

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Re: diesels at shutdown
« Reply #5 on: March 12, 2009, 12:02:10 pm »
both good points....thanks.
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1982 Shortbed K10 Silverado.  305 ci with a mild cam, full true dual exhaust (Long tube headers, "H" pipe, and Thrush Turbo mufflers.  4x4, and otherwise completely stock.  about 153,000 miles.

Offline the_legend_1981

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Re: diesels at shutdown
« Reply #6 on: March 12, 2009, 05:29:58 pm »
what should you do if the choke sticks? I have that problem.
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Offline eventhorizon66

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Re: diesels at shutdown
« Reply #7 on: March 12, 2009, 06:19:47 pm »
We are talking the factory electric choke right?  In my case, I ended up simply replacing the choke coil.
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'85 C10 SWB 350 700R4 TKO600

Offline Russ130

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Re: diesels at shutdown
« Reply #8 on: March 13, 2009, 06:05:45 am »
If the choke and timing are ok I'd check for vacumn leaks next. A vacumn leak can make it run with a high idle in park and neutral and very low in gear.
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Offline Thermal Izod

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Re: diesels at shutdown
« Reply #9 on: March 13, 2009, 02:09:28 pm »
i've already fixed a lot of bad hoses etc that were leaking...i'll have to really look at the intake seal, b/c that's just about all that could be leaking still...first off though, I'm gonna try to readjust the idle screw, and check the choke.  Thanks for all the good input guys.  I've gotta work all weekend, so i'll get around to posting an outcome ASAP....
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1982 Shortbed K10 Silverado.  305 ci with a mild cam, full true dual exhaust (Long tube headers, "H" pipe, and Thrush Turbo mufflers.  4x4, and otherwise completely stock.  about 153,000 miles.
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