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| Low engine power cannot back-up incline [message #205442] |
Sun, 21 April 2013 18:31  |
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SeanKidd
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
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Senior Member |
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OK, Got ambitious today and moved my coach, if you recall last June i bought my 73 CanyonLands and blew an oil line driving it home, subsequently seizing the engine. Since then,rebuilt engine, heads, Melling RV Cam, one ton, quadra, yadda yadda.
I decided to move the coach. drove it down the block, turned around at the Mineral Museum and headed back 1000 yards tops, began to back up driveway (slight incline) and ran out of gas. added gas but has no power, can only get my foot in the throttle about 25% secondaries open and engine bogs down and dies. back wheels are about 8" above fronts maybe a foot to 18 inches incline in 26 feet. Tried advancing/retarding new HEI with no avail. come to think of it i'm still running stock gap on plugs. all input will be appreciated. shift into R has positive engagement, trans is not slipping. (stock FD)
Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
[Updated on: Sun, 21 April 2013 18:33] Report message to a moderator |
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| Re: Low engine power cannot back-up incline [message #205447 is a reply to message #205442] |
Sun, 21 April 2013 18:59  |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| SeanKidd wrote on Sun, 21 April 2013 18:31 |
OK, Got ambitious today and moved my coach, if you recall last June i bought my 73 CanyonLands and blew an oil line driving it home, subsequently seizing the engine. Since then,rebuilt engine, heads, Melling RV Cam, one ton, quadra, yadda yadda.
I decided to move the coach. drove it down the block, turned around at the Mineral Museum and headed back 1000 yards tops, began to back up driveway (slight incline) and ran out of gas. added gas but has no power, can only get my foot in the throttle about 25% secondaries open and engine bogs down and dies. back wheels are about 8" above fronts maybe a foot to 18 inches incline in 26 feet. Tried advancing/retarding new HEI with no avail. come to think of it i'm still running stock gap on plugs. all input will be appreciated. shift into R has positive engagement, trans is not slipping. (stock FD)
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Starving for fuel. Plugged filter or something.
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| Re: Low engine power cannot back-up incline [message #205448 is a reply to message #205447] |
Sun, 21 April 2013 19:01 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| SeanKidd wrote on Sun, 21 April 2013 18:31 |
OK, Got ambitious today and moved my coach, if you recall last June i bought my 73 CanyonLands and blew an oil line driving it home, subsequently seizing the engine. Since then,rebuilt engine, heads, Melling RV Cam, one ton, quadra, yadda yadda.
I decided to move the coach. drove it down the block, turned around at the Mineral Museum and headed back 1000 yards tops, began to back up driveway (slight incline) and ran out of gas. added gas but has no power, can only get my foot in the throttle about 25% secondaries open and engine bogs down and dies. back wheels are about 8" above fronts maybe a foot to 18 inches incline in 26 feet. Tried advancing/retarding new HEI with no avail. come to think of it i'm still running stock gap on plugs. all input will be appreciated. shift into R has positive engagement, trans is not slipping. (stock FD)
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Starving for fuel. Plugged filter or something. Maybe water in the gas you fed it last.
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| Re: Low engine power cannot back-up incline [message #205454 is a reply to message #205442] |
Sun, 21 April 2013 20:42 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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I had a no power issue that was causes by a messed up tranny governer. Was stuck in third gear. Took off sluggish from a flat start. But on a hill down the street, i almost was stuck at bottum.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Low engine power cannot back-up incline [message #205487 is a reply to message #205447] |
Mon, 22 April 2013 06:07 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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What is your vacuum when idling, in park? If you have less than 12" sitting there at idle, I think you may have a vacuum leak either externally or internally. In that this is a freash motor, untried this may be the issue. A motor will idle with as little as 5" of cavuum but as soon as you ask it to do work it will fall on it's face. Good luck,
BTW, if you appreciate having vacuum to pull over when your motor stops, you have another option than a motor driven pump. I have simply stayed out of it in that those that promote installing a motor driven vacuum pump have been so persistent, I too feel it's important to hav
e countermeasures here but prefer to do it with a more reliable system. 2 PVC made vacuum tanks, 30"x4" connected in series adding one extra check valve like the one already being used on your vacuum assisted brake booster will give you 4-5 hits on your brake under vacuum. That should be more than enough to get safely to the side of the road. This system has to be more reliable in that there are no electrical relays or motors which are the highest failure rate components in electronics. A system like supplimental vacuum for brakes is something that may never be needed but when it does it really needs to be there for you 100%. This system is passivem no electrical parts, nothing to check other than periodically kill your motor to see if you have a pedal. I sell the plans for $5, one part from your auto parts dealer (another vacuum check valves) and the rest of the parts come from your local hardeware store. I am not willing to debate if the
system works because I have had this exact setup on many coaches, mine has been operating exactly as specified for over 4 years and I have not touched it.
I just want those new lurkers out there hanging on every word to know there are options. Yes, having a supplimental emergency backup to provide vacuum to your brake booster with your motor off is a good thing but you do not need to go the way of an elaborate electrical circuit and several involved setups to make this happen. If any of you want to know more about the system you can contact me off line. It does work well, it is very inexpensive and rock solid reliable...
Jim Bounds
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________________________________
From: A. <markbb1@netzero.com>
To: gmclist@temp.gmcnet.org
Sent: Sunday, April 21, 2013 7:59 PM
Subject: Re: [GMCnet] Low engine power cannot back-up incline
SeanKidd wrote on Sun, 21 April 2013 18:31
> OK, Got ambitious today and moved my coach, if you recall last June i bought my 73 CanyonLands and blew an oil line driving it home, subsequently seizing the engine. Since then,rebuilt engine, heads, Melling RV Cam, one ton, quadra, yadda yadda.
>
> I decided to move the coach. drove it down the block, turned around at the Mineral Museum and headed back 1000 yards tops, began to back up driveway (slight incline) and ran out of gas. added gas but has no power, can only get my foot in the throttle about 25% secondaries open and engine bogs down and dies. back wheels are about 8" above fronts maybe a foot to 18 inches incline in 26 feet. Tried advancing/retarding new HEI with no avail. come to think of it i'm still running stock gap on plugs. all input will be appreciated. shift into R has positive engagement, trans is not slipping. (stock FD)
Starving for fuel. Plugged filter or something.
--
'73 23' Sequoia For Camping
'73 23' CanyonLands For Sale
UA (Upper Alabama)
"Time is money. If you use YOUR time, you get to keep YOUR money."
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| Re: [GMCnet] Low engine power cannot back-up incline [message #205489 is a reply to message #205487] |
Mon, 22 April 2013 06:36 |
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SeanKidd
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
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Senior Member |
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Thanks Jim, I have great vacuum 19" at idle, I had the carb off, soaked and kit installed, (had fuel weeping at main venturi during idle) i shimmed the main throttle shaft and got an additional 1.2" Hg! Its not the first Qjet i've done, but certainly the first in 20 years (professionally trained as mechanic) I did not touch the air valve, i will be trying that today. I installed a JC4 vacuum pump and realized its necessity immediately...
Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
[Updated on: Mon, 22 April 2013 06:49] Report message to a moderator |
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| Re: [GMCnet] Low engine power cannot back-up incline [message #205511 is a reply to message #205489] |
Mon, 22 April 2013 10:19 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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How is your power when trying to go up an incline in forward??
Ray
Ray & Lisa
78 Royale "Great Lakes Eagle"
Center Kitchen TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
________________________________
From: Sean Kidd <fiatkidd@yahoo.com>
To: gmclist@temp.gmcnet.org
Sent: Mon, April 22, 2013 6:36:56 AM
Subject: Re: [GMCnet] Low engine power cannot back-up incline
Thanks Jim, I have great vacuum 19" at idle, I had the carb off, soaked and kit
installed, (had fuel weeping at main venturi during idle) i shimmed the main
throttle shaft and got an additional 1.2" Hg! Its not the first Qjet i've done,
but certainly the first in 20 years (professionally trained as mechanic) I did
not touch the air valve, i will be trying that today.
--
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quadra Bags, Rear Disc, Reaction Arms,
Fluorescent Mineral Capital of the World, New Jersey
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: Low engine power cannot back-up incline [message #205518 is a reply to message #205515] |
Mon, 22 April 2013 12:38 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| SeanKidd wrote on Mon, 22 April 2013 12:03 |
Got it! The air valve (secondary air flap) was waayyyy too loose, this causes it to open prematurely and bog. Probably as a result of cleaning the gunk out of it. I'm sure the 3rd 5 gal can of premium fuel helped too. Great throttle response now. Thank you to all that responded.
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Doh! You told us the secondaries were opening at 25% throttle and we thought you were just guestimating wrong.
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