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12-29-2010, 02:25 AM | #1 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,019
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Missing at freeway speeds
My trucks (71K20 350 4spd) basically been sitting since August. Moved it from front yard to back last time I drove it. I mostly just use it as a truck, hauling junk, towing more junk lol. But ever since I got it a couple years ago there is a miss at freeway speeds. Nothing terrible but it sure makes me nervous so I was never far from home, and only took back roads.
I checked everything I could think of, even asked here on the board. Well back before I moved it to the back yard my son and I were sitting there staring at the engine with the air cleaner off. He noticed one of the vac plugs on the carb looked funny. He went to pull it off and the tip pulled loose. We found another larger one the same way. So I replaced them. Never bothered to test drive the truck (stuff came up right after that). This weekend I got a wild hair and decided to take the truck for a spin (literally, it was stuck in the grass) 4 wheel drive took care of that. I drove all over. Up to Sultan, back to Everett and back home to Monroe. Zero problems at any speed. That has never happened since Ive owned it. So I guess what I'm saying here is check your old vacuum plugs on the carb. They can cause weird stumbling problems at higher speed if they are cracked a little. Next I need to figure out what that horrible clunking sound is when Im putting around (sounds like a drive shaft clunking). Im the second owner and the original owner told me he had the truck back at the dealers many times trying to figure out what the noise was and its never been figured out after almost 40 years on the road. Maybe it will go away when I switch it over to automatic? Gotta love these old rigs =) Mark
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12-29-2010, 02:46 AM | #2 |
But Found Her 25yrs Later!
Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,530
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Re: Missing at freeway speeds
Thanks for the reminder.
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
12-29-2010, 12:59 PM | #3 | |
Recovering 67-72 Addict
Join Date: Oct 2000
Location: North Bend, WA
Posts: 1,788
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Re: Missing at freeway speeds
Quote:
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68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women" |
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12-29-2010, 01:09 PM | #4 |
Project Junkie! Fishing Poor!!
Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,766
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Re: Missing at freeway speeds
I agree with breeh. I had a possi in one of my past big block burbs and it use to clunk around corners. It could be universal joints to, but I would emagine you already checked that. WES
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On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys |
12-29-2010, 02:38 PM | #5 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,019
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Re: Missing at freeway speeds
Yeah it has a no spin detroit and that makes a different sound, sometimes much scarier when it bangs lol.
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12-29-2010, 03:58 PM | #6 | |
Always on the hunt...
Join Date: Sep 2006
Location: Portland, OR.
Posts: 5,746
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Re: Missing at freeway speeds
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12-29-2010, 09:28 PM | #7 | |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,019
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Re: Missing at freeway speeds
Quote:
I do have all the 4X4 turbo 350 parts for it now. Hopefully one of these days I will get motivated to do the swap.
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12-29-2010, 10:02 PM | #8 |
Project Junkie! Fishing Poor!!
Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,766
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Re: Missing at freeway speeds
I have a 205 / T-400 sitting here... WES
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On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys |
12-29-2010, 11:34 PM | #9 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,019
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Re: Missing at freeway speeds
Wes you know that I would love to have that set up. If money wasnt so tight I would be all over it. Need anything in trade? How bout a green suburban full length qtr =)
Just hang on to it for me till the economy turns around (wishful thinking)
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12-29-2010, 11:49 PM | #10 |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,396
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Re: Missing at freeway speeds
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12-30-2010, 01:43 AM | #11 | |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,019
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Re: Missing at freeway speeds
Quote:
I thought the whole rear end blew up first time it made that bang in a turn, scared the crap outta me. I was shocked when I was just able to keep driving and pull over to take a cautious peek under the truck
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12-30-2010, 01:45 PM | #12 | |
Project Junkie! Fishing Poor!!
Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,766
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Re: Missing at freeway speeds
Quote:
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On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys |
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12-30-2010, 11:12 PM | #13 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 20,019
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Re: Missing at freeway speeds
Works for me ... wonder what else I can dig up for the guy that has every truck part imaginable?
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