Problems when Shutting off engine Pick up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JonCheun · 02-14-2013, 08:47 PM

I have a 1968 C10 with a 350 engine. Lately when I turn the pick up off the engine clears its throat. Is this bad for the engine? How do I solve this?

68gmsee · 02-14-2013, 09:12 PM

Is it like a sigh of relief and then a cough? It could be carbon buildup. I had one that started like that and then after a while it kept running or dieseling.

Causes can be due to bad or cheap "stop and go" fuel, timing problems or even overheating.

If it's not timing or overheating, start by using fuel from the big companies like Shell, Exxon, Chevron, etc. Buy a couple of cans of gas treatment. I used Chevron but some others like Seafoam. Pour them into a full tank. You may have to do that at least two maybe three times.

Some others use the old pouring gas treatment down the carb throat, but living in town, I couldn't do that.

JonCheun · 02-14-2013, 09:36 PM

68gmsee

When I turn the key off, the engine gargles and then clears its thoat loud. I will try to stick with one grade of fuel. I like to use 91 from costco b/c it's the cheapest 91 in town but I sometimes put 87 from shell and 87 from chevron. I'll try just putting 91 and the gas treatment. I have noticed that it happens after it is warm but my engine doesn't exceed 190 degres.

JonCheun · 02-14-2013, 09:37 PM

68gmsee

When I turn the key off, the engine gargles and then clears its thoat loud. I will try to stick with one grade of fuel. I like to use 91 from costco b/c it's the cheapest 91 in town but I sometimes put 87 from shell and 87 from chevron. I'll try just putting 91 and the gas treatment. I have noticed that it happens after it is warm but my engine doesn't exceed 190 degres.

Lee H · 02-14-2013, 10:44 PM

Your idle is to high.
Posted via Mobile Device

**leddzepp** · 02-14-2013, 10:49 PM

Clean your spark plugs, could be carbon build up causing it to diesel. Idle could also be set too high.

luvbowties · 02-15-2013, 02:17 PM

Quote:

Originally Posted by JonCheun

I have a 1968 C10 with a 350 engine. Lately when I turn the pick up off the engine clears its throat. Is this bad for the engine? How do I solve this?

Like another poster said, idle may be too high. If it continues after all parameters are set, try leaving it in gear while you switch it off--if auto trans; if stick shift, ease out on clutch a tad, in gear, and then switch it off.
Sam

02-14-2013, 08:47 PM	#1
JonCheun Registered User Join Date: Jan 2013 Location: Las Vegas,NV Posts: 59	Problems when Shutting off engine Pick up I have a 1968 C10 with a 350 engine. Lately when I turn the pick up off the engine clears its throat. Is this bad for the engine? How do I solve this?

02-14-2013, 09:12 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Problems when Shutting off engine Pick up Is it like a sigh of relief and then a cough? It could be carbon buildup. I had one that started like that and then after a while it kept running or dieseling. Causes can be due to bad or cheap "stop and go" fuel, timing problems or even overheating. If it's not timing or overheating, start by using fuel from the big companies like Shell, Exxon, Chevron, etc. Buy a couple of cans of gas treatment. I used Chevron but some others like Seafoam. Pour them into a full tank. You may have to do that at least two maybe three times. Some others use the old pouring gas treatment down the carb throat, but living in town, I couldn't do that. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

02-14-2013, 09:36 PM	#3
JonCheun Registered User Join Date: Jan 2013 Location: Las Vegas,NV Posts: 59	Re: Problems when Shutting off engine Pick up 68gmsee When I turn the key off, the engine gargles and then clears its thoat loud. I will try to stick with one grade of fuel. I like to use 91 from costco b/c it's the cheapest 91 in town but I sometimes put 87 from shell and 87 from chevron. I'll try just putting 91 and the gas treatment. I have noticed that it happens after it is warm but my engine doesn't exceed 190 degres.

02-14-2013, 09:37 PM	#4
JonCheun Registered User Join Date: Jan 2013 Location: Las Vegas,NV Posts: 59	Re: Problems when Shutting off engine Pick up 68gmsee When I turn the key off, the engine gargles and then clears its thoat loud. I will try to stick with one grade of fuel. I like to use 91 from costco b/c it's the cheapest 91 in town but I sometimes put 87 from shell and 87 from chevron. I'll try just putting 91 and the gas treatment. I have noticed that it happens after it is warm but my engine doesn't exceed 190 degres.

02-14-2013, 10:44 PM	#5
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: Problems when Shutting off engine Pick up Your idle is to high. Posted via Mobile Device __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

02-14-2013, 10:49 PM	#6
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,036	Re: Problems when Shutting off engine Pick up Clean your spark plugs, could be carbon build up causing it to diesel. Idle could also be set too high. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul



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