Home » Public Forums » GMCnet » [GMCnet] GMCer from SLC in Cleveland Needs help
| [GMCnet] GMCer from SLC in Cleveland Needs help [message #215932] |
Sat, 27 July 2013 22:42  |
Gailen Vick
Messages: 4
Registered: March 2013
Karma: 0
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Junior Member |
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Complete check out of Motorhome at Applied GMC in March, June trip to
Vicksburg, Miss.
1. 300 miles, lunging and possible vapor lock problems as I climb to
Denver from SLC.
2. 700 miles, amp meter starts pegging the limits, Head lights vary
in intensity at night depending on rpm.
3. 1500 miles, refrigerator shops working on propane or AC from
generator or AC shore power.
4. 1100 miles, amp meter starts shows 13.2 volts, generator stops
working, we hear hissing in the generator compartment.
5. 100 miles, 12V feeding the TV shuts down, Amp meter shows 10 volts.
6. 30 miles, engine starts to die, Amp meter is pegged negative &
Emerg Batt/boost battery switch doesn’t help.
7. Find Larry Foote in SLC on GMC Black List, towed to his shop and
team goes to work and finds replaces & repairs.
a. Back 6V batteries dry as a bone and bulging, replaced, Front
battery, no charge, when charged everything comes to life again.
b. Generator is dead, upgraded for 80 to 100 amps.
c. Major grounding rewiring of front 12V and the 2 golf 6V batteries,
Starter battery replaced & upgraded.
d. Solenoids replace in front and back, 12V discharging prevention
switch installed.
e. Tubing stalled around fuel line between gas filter and carburetor &
Installed Gene’s Electric fuel Pump,
http://gmcmotorhome.info/engine.html#pump
July Trip to Cleveland – Cinnabar
1. 1730 miles and arrive in Cleveland, everything is working, no
Engine lunging or vapor lock problem gone.
2. After major rain storm, lunging of engine, only high RPM will keep
engine running.
3. Every time I have to stop, engine dies. Major black smoke and soot
from exhaust after start up, engine limps along for the next 100 miles.
4. Engine seem to be flooding from gas, yet I arrive at Cinnabar
(whew, I made it). Turn off engine. Start engine, purrs like a cat and runs
fine?????
5. Cinnabar upgrades and replaces the following;
a. Carburetor & Distributor – replaced along with distributor cap and
coil.
b. Additional 12V battery installed in parallel with the 2 6V golf
batteries that are in series and Caps for recovering moisture installed.
c. Gas tank selector valve replaced and fuel gauge repair and new
tubing ran.
6. Everything works great, engine starts easy without pumping gas
pedal. The motorhome steers itself!!!!!!!!!!!!!!!
7. 60 miles from Cinnabar, Cruise Control starts dropping off.
8. 200 miles from Cinnabar, engine start to lunge (just like before)
after running for 3.5 hours at 65-70 miles per hour.
9. Engine continues to run, but only at high RPM (around 3K), dies at
toll booth, very hard to start again, Major black smoke and soot from
exhaust after start up.
10. I fill up at gas station. When starting again, everything starts
working great again, no problems, arrive in Cleveland without any problems,
engine purring like a cat.
11. Today, Saturday morning I start the engine, hard to start Major black
smoke and soot from exhaust after start up.
12. This evening, I start the engine without any pumping of the gas
pedal, engine purring like a cat and again 30 minutes later without a
problem???????
I need your help. I will be traveling back to SLC/Lehi on Monday. Anyone
seen anything like this before. Any thoughts. What in the world could be
going wrong??????
Gailen Vick
1975 Eleganza II from Lehi, Utah
510-364-761 cell phone
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| Re: [GMCnet] GMCer from SLC in Cleveland Needs help [message #215951 is a reply to message #215932] |
Sun, 28 July 2013 07:05  |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
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Senior Member |
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I am not good at this, but i would think it is the coil that only goes out at getting hot.
back smoke can mean the spark is not working to burn the gas which the coil produces.
the coil is wound wire and can short out at particular states of heat in the windings.
change coil, spark plugs, wires and cap rotor stuff like that should get it. My 2Cents,
mickey 77 palm booch, anaheim ca. disneyland.
most likely just the coil.
On Jul 27, 2013, at 8:42 PM, Gailen Vick wrote:
> Complete check out of Motorhome at Applied GMC in March, June trip to
> Vicksburg, Miss.
>
> 1. 300 miles, lunging and possible vapor lock problems as I climb to
> Denver from SLC.
>
> 2. 700 miles, amp meter starts pegging the limits, Head lights vary
> in intensity at night depending on rpm.
>
> 3. 1500 miles, refrigerator shops working on propane or AC from
> generator or AC shore power.
>
> 4. 1100 miles, amp meter starts shows 13.2 volts, generator stops
> working, we hear hissing in the generator compartment.
>
> 5. 100 miles, 12V feeding the TV shuts down, Amp meter shows 10 volts.
>
> 6. 30 miles, engine starts to die, Amp meter is pegged negative &
> Emerg Batt/boost battery switch doesn’t help.
>
> 7. Find Larry Foote in SLC on GMC Black List, towed to his shop and
> team goes to work and finds replaces & repairs.
>
> a. Back 6V batteries dry as a bone and bulging, replaced, Front
> battery, no charge, when charged everything comes to life again.
>
> b. Generator is dead, upgraded for 80 to 100 amps.
>
> c. Major grounding rewiring of front 12V and the 2 golf 6V batteries,
> Starter battery replaced & upgraded.
>
> d. Solenoids replace in front and back, 12V discharging prevention
> switch installed.
>
> e. Tubing stalled around fuel line between gas filter and carburetor &
> Installed Gene’s Electric fuel Pump,
> http://gmcmotorhome.info/engine.html#pump
>
> July Trip to Cleveland – Cinnabar
>
> 1. 1730 miles and arrive in Cleveland, everything is working, no
> Engine lunging or vapor lock problem gone.
>
> 2. After major rain storm, lunging of engine, only high RPM will keep
> engine running.
>
> 3. Every time I have to stop, engine dies. Major black smoke and soot
> from exhaust after start up, engine limps along for the next 100 miles.
>
> 4. Engine seem to be flooding from gas, yet I arrive at Cinnabar
> (whew, I made it). Turn off engine. Start engine, purrs like a cat and runs
> fine?????
>
> 5. Cinnabar upgrades and replaces the following;
>
> a. Carburetor & Distributor – replaced along with distributor cap and
> coil.
>
> b. Additional 12V battery installed in parallel with the 2 6V golf
> batteries that are in series and Caps for recovering moisture installed.
>
> c. Gas tank selector valve replaced and fuel gauge repair and new
> tubing ran.
>
> 6. Everything works great, engine starts easy without pumping gas
> pedal. The motorhome steers itself!!!!!!!!!!!!!!!
>
> 7. 60 miles from Cinnabar, Cruise Control starts dropping off.
>
> 8. 200 miles from Cinnabar, engine start to lunge (just like before)
> after running for 3.5 hours at 65-70 miles per hour.
>
> 9. Engine continues to run, but only at high RPM (around 3K), dies at
> toll booth, very hard to start again, Major black smoke and soot from
> exhaust after start up.
>
> 10. I fill up at gas station. When starting again, everything starts
> working great again, no problems, arrive in Cleveland without any problems,
> engine purring like a cat.
>
> 11. Today, Saturday morning I start the engine, hard to start Major black
> smoke and soot from exhaust after start up.
>
> 12. This evening, I start the engine without any pumping of the gas
> pedal, engine purring like a cat and again 30 minutes later without a
> problem???????
>
>
>
> I need your help. I will be traveling back to SLC/Lehi on Monday. Anyone
> seen anything like this before. Any thoughts. What in the world could be
> going wrong??????
>
>
>
> Gailen Vick
>
> 1975 Eleganza II from Lehi, Utah
>
> 510-364-761 cell phone
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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| Re: [GMCnet] GMCer from SLC in Cleveland Needs help [message #215964 is a reply to message #215932] |
Sun, 28 July 2013 09:41 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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Black smoke sounds like a rich mixture. Next time it does that, pull the top of the air filter and see that the choke is fully open. Air flow through the carb at high RPM will cause the choke to open somewhat which might explain some things. If the choke is not fully open, wiggle it and see if it is binding.
Carb flooding will also cause the symptoms you describe. Check for a leaky float or bad needle and seat or just some grit in the bowl that sometimes keeps the needle from seating.
Get a cheap aftermarket vacuum gauge and monitor vacuum. In my experience vacuum leaks can cause the kind of things you mention but they are not intermittent. Lots of things I haven't experienced however.
Focusing on the drivability issues, I'm leaning toward the choke.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] GMCer from SLC in Cleveland Needs help [message #215983 is a reply to message #215964] |
Sun, 28 July 2013 12:44 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Bad float needle seal?
Choke malfunction ?
Collapsing intake air snorkel if you have dryer duct style fresh air duct to air cleaner?
Todd Sullivan
Sully
77 royale
Seattle
On Jul 28, 2013, at 7:41 AM, Kerry Pinkerton <Pinkertonk@MCHSI.com> wrote:
>
>
> Black smoke sounds like a rich mixture. Next time it does that, pull the top of the air filter and see that the choke is fully open. Air flow through the carb at high RPM will cause the choke to open somewhat which might explain some things. If the choke is not fully open, wiggle it and see if it is binding.
>
> Carb flooding will also cause the symptoms you describe. Check for a leaky float or bad needle and seat or just some grit in the bowl that sometimes keeps the needle from seating.
>
> Get a cheap aftermarket vacuum gauge and monitor vacuum. In my experience vacuum leaks can cause the kind of things you mention but they are not intermittent. Lots of things I haven't experienced however.
>
> Focusing on the drivability issues, I'm leaning toward the choke.
> --
> Kerry Pinkerton
>
> North Alabama, near Huntsville,
>
> 77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as an Art Deco car hauler
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] GMCer from SLC in Cleveland Needs help [message #215990 is a reply to message #215932] |
Sun, 28 July 2013 14:10 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| Gailen Vick wrote on Sat, 27 July 2013 20:42 |
Complete check out of Motorhome at Applied GMC in March, June trip to
Vicksburg, Miss.
5. Cinnabar upgrades and replaces the following;
a. Carburetor & Distributor – replaced along with distributor cap and
coil.
6. Everything works great, engine starts easy without pumping gas
pedal. The motorhome steers itself!!!!!!!!!!!!!!!
10. I fill up at gas station. When starting again, everything starts
working great again, no problems, arrive in Cleveland without any problems,
engine purring like a cat.
11. Today, Saturday morning I start the engine, hard to start Major black
smoke and soot from exhaust after start up.
12. This evening, I start the engine without any pumping of the gas
pedal, engine purring like a cat and again 30 minutes later without a
problem???????
I need your help. I will be traveling back to SLC/Lehi on Monday. Anyone
seen anything like this before. Any thoughts. What in the world could be
going wrong??????
Gailen Vick
|
Gailen,
Sorry you are having such troubles. I agree it sounds like flooding and would suspect carb float or choke,
except
Cinnabar replaced the coil, cap and carburetor.
This may be a long shot, but we have seen the following happen repeatedly to one coach...
Next time this happens, take the hose from the carbon canister off _with extreme caution_. We had a fuel injection GMC that had these rich episodes and the separator valve in front of the left frontmost bogie was letting raw gas into the carbon canister. Then the gas was being sucked into the intake manifold.
I am wondering if pressure is building up in the tank and shoving gas into the canister. Be very careful when you pull the hose from canister at the carb in case there is raw gas squirting out. Stopping for gas would relieve the pressure and cool the tanks... for a while.
Have you ever noticed gas dripping just behind the right front wheel? (Where the canister is)
What ever you do, don't just disconnect the canister as raw gas or vapor could cause a fire.
Sometimes tapping on the separator valve will get the little ball moving again. Perhaps carefully opening the gas cap, to relieve pressure if it is going suddenly rich.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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