Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-19-2013, 04:42 PM   #1
4 Rivet Member
 
Jenniflow's Avatar
 
1982 34' Limited
1986 34.5' Airstream 345
Sausalito , California
Join Date: Sep 2010
Posts: 405
Send a message via Skype™ to Jenniflow
Chevy 454 stalling on '86 moho

Hi folks,
I have a 1986 345 Moho that we are just starting to use again after about 6 months. She is doing greet so far except that she is stalling several times when I first start her up, even if I let the engine warm up for 10 minutes first. The oil pressure light comes on and I am standing in the brake.

If I let it warm up for 25 minutes this tends not to happen but at this point I'm not really that sure that's the factor of most relevance.

I have several questions. If you have any thoughts I'd appreciate it:

1) what could be going on?
2) what is the best oil for this engine pulling 34.5 feet of coach? We live in northern CA where the temp occasionally dips below freezing during long periods when the Moho is stored.
3) should we use different weight oils in the winter and in the summer?

Thanks!
Jenniflow
__________________

__________________
sent from my hipflask
Jenniflow is offline   Reply With Quote
Old 10-19-2013, 04:47 PM   #2
cwf
Rivet Master
 
cwf's Avatar
 
1999 34' Excella
Currently Looking...
Hillsboro , Texas
Join Date: Feb 2013
Posts: 5,931
Images: 2
My thought is bad fuel. How full is tank? Can or have you put additive,?
__________________

__________________
Peace and Blessings..
Channing
WBCCI# 30676
cwf is offline   Reply With Quote
Old 10-19-2013, 05:03 PM   #3
Rivet Master
 
TomW's Avatar
 
1967 26' Overlander
Huntsville , Alabama
Join Date: Dec 2003
Posts: 2,918
Images: 2
Carb or Fuel Injected?

Quote:
Originally Posted by Jenniflow View Post
... she is stalling several times when I first start her up ...The oil pressure light comes on ...

1) what could be going on?

2) what is the best oil for this engine ...
1) The warm-up throttle setting is way too low. But with a cold engine, the oil pressure light coming on means either a worn sensor or tired engine.

2) I used 10W-40 in my 454 engine (the same one you have) year around.

Tom
TomW is offline   Reply With Quote
Old 10-19-2013, 05:20 PM   #4
Rivet Master
 
Waipio Rim's Avatar
 
1984 31' Airstream310
Honokaa , Hawaii
Join Date: Jun 2010
Posts: 667
If the idle speed drops too low for awhile on the way to the engine quitting, oil pressure will drop and the light will come on. This will hopefully go away once you get the problem fixed.

Sounds like a bad fuel or carburetor problem. If it does not improve as you get rid of the old fuel and/or you don't know when the carburetor was last rebuilt, look around for a mechanic who is old enough to know how to rebuild a Quadrajet carburetor. Our gas mileage improved by about 40% when we had ours rebuilt.
__________________
Waipio Rim is offline   Reply With Quote
Old 10-19-2013, 10:46 PM   #5
Rivet Master
 
2005 19' Safari
GLENDALE , AZ
Join Date: Aug 2004
Posts: 2,441
Above suggests are all good ones. Problem sounds like a sticky or improperly adjusted choke, or a possible sticking or defective carburetor float or bad valve/seat (assuming your engine is carbureted).

When we had our 454 rebuilt (in a 1978 Chevy crew cab pickup), we ran straight 20W for awhile, per the rebuilder's recommendation for Phoenix, AZ (110+ desert heat in the summer and a few nights in mid-20's in the winter). However, after the first year, I switched to 10W-30; and later to 10W-40 (for convenience, since our other cars used 10W-40). For northern California, I'd use 10W-30.

Also, just my opinion, but I'd use regular Castrol, Quaker State or Pennzoil and NOT synthetic oil; and change it at 3-5,000 miles. 454's can be hard on oil; and while synthetics will last longer, they can also tempt you to stretch the time between oil changes. It's safer to change your oil more frequently; and you won't feel so bad about changing it, if you aren't paying premium prices for synthetic.
__________________
Phoenix is offline   Reply With Quote
Old 10-20-2013, 10:48 AM   #6
4 Rivet Member
 
Jenniflow's Avatar
 
1982 34' Limited
1986 34.5' Airstream 345
Sausalito , California
Join Date: Sep 2010
Posts: 405
Send a message via Skype™ to Jenniflow
These are great suggestions, thanks! I suspect it is related to the carburetor since it's never been rebuilt. I'd love to gain some efficiency, while we're at it.

The gas I'm using is about six months old and though I did add a couple of bottles of dry gas to the approx 40 gallons of gas that were in the tank, I was adding it to the top. I don't know how well dry gas mixes on a short sprint to our current location.

I should probably take her for a longer drive to test it but it's Sunday and I can't take her in for service today if something goes more wrong. My main goal is to move her from one space in a cAmpground to another where I'll be storing her for another six months, having lived in her for one.

I will certainly look around for someone who knows quadrajets. Maybe I should try the VA retirement home! ;-))

I just remembered that I have about six bottles of that Shell Oil in one of the compartments. I bet it's over ten years old! (Long story). I'm also betting I can't use that any more, right? And I wouldn't want to add any of it in top of whatever's in there now? (I have to check with the garage that changed the oil in March.)

Thanks again!
Jenniflow
__________________
sent from my hipflask
Jenniflow is offline   Reply With Quote
Old 10-20-2013, 11:19 AM   #7
Rivet Loser
 
Punch's Avatar
 
La Ronge , Saskatchewan
Join Date: Nov 2011
Posts: 328
Quote:
Originally Posted by Jenniflow View Post
I will certainly look around for someone who knows quadrajets. Maybe I should try the VA retirement home! ;-))

Jenniflow
I take it you're not mounting a charm offensive.
__________________
Punch is offline   Reply With Quote
Old 10-20-2013, 02:01 PM   #8
4 Rivet Member
 
Jenniflow's Avatar
 
1982 34' Limited
1986 34.5' Airstream 345
Sausalito , California
Join Date: Sep 2010
Posts: 405
Send a message via Skype™ to Jenniflow
Ha! No, I'm getting close to retirement age myself! Last time I took this coach to a garage, the (young) mechanic looked at it, stroked his chin thoughtfully and said, "Yeah there was some old guy used to come around here who knew these engines. Maybe we can get him for you?"(!!)
__________________
sent from my hipflask
Jenniflow is offline   Reply With Quote
Old 10-20-2013, 04:58 PM   #9
cwf
Rivet Master
 
cwf's Avatar
 
1999 34' Excella
Currently Looking...
Hillsboro , Texas
Join Date: Feb 2013
Posts: 5,931
Images: 2
Us "old QUadrajet guys" are still around. There will be some "hot rod" shops with ancient Talismans to recover your lost mojo.
__________________
Peace and Blessings..
Channing
WBCCI# 30676
cwf is offline   Reply With Quote
Old 10-20-2013, 07:02 PM   #10
CLOUDSPLITTER "Tahawas"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 11,153
Images: 1
Thumbs up

If are enamored of the Q-jet, get it done right......OR..

After carb work and BEFORE starting. Replace all fuel filters and inspect lines, consider flushing/sealing or replacing gas tank.

You could always replace it with a newer up-grade.

Bob
__________________
PFC.....

“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
RLC
ROBERT CROSS is offline   Reply With Quote
Old 10-20-2013, 08:37 PM   #11
Rivet Loser
 
Punch's Avatar
 
La Ronge , Saskatchewan
Join Date: Nov 2011
Posts: 328
Quote:
Originally Posted by ROBERT CROSS View Post
If are enamored of the Q-jet, get it done right......OR..

After carb work and BEFORE starting. Replace all fuel filters and inspect lines, consider flushing/sealing or replacing gas tank.

You could always replace it with a newer up-grade.

Bob
Both your links are for 66-78 applications, apparently. Would these be right for mid-late 80's 454's? I have read elsewhere that these people are very knowledgeable and produce an excellent rebuilt.

http://www.smicarburetor.com/product...8/productID/18
__________________
Punch is offline   Reply With Quote
Old 10-21-2013, 02:47 AM   #12
Rivet Master
 
2005 19' Safari
GLENDALE , AZ
Join Date: Aug 2004
Posts: 2,441
While there are lots of places that sell rebuilt carburetors, I have found that rebuilding your own existing carburetor eliminates a lot of headaches. GM used a lot of different carburetors on 454's over the decades that this engine has been in production, and switching carbs often causes additional problems from very slight incompatibilities. Just my opinion...

By the way, for those in or near Phoenix, that carburetor repair shop is:

Carburetor & Radiator Exchange (a.k.a., Short Money Carburetor Exchange)
9120 N. 7th Street, Phoenix, AZ 85020
Phone: (602) 944-0800

Note: I have no affiliation with this business, other than being a satisfied customer. Over the years, I had the carburetor on Hal, our old 1978 Chevy crewcab pickup with 454 V8, rebuilt there 3-4 times.
__________________
Phoenix is offline   Reply With Quote
Old 10-21-2013, 06:40 AM   #13
Figment of My Imagination
 
Protagonist's Avatar
 
2012 Interstate Coach
From All Over , More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,300
Quote:
Originally Posted by Jenniflow View Post
The gas I'm using is about six months old…
The older the engine, the less happy it will be with ethanol-blend gasoline. Especially gas that sat for months so that phase separation could occur. Once you get it running the way you want, you would be well advised to run the engine every couple of weeks even when you're not going camping, preferably actual driving and not just idling since that will also agitate the fuel in the tank. But even if you just run it at idle, you'll make sure there's no stale fuel in the carburator bowl or fuel filter.

Quote:
I just remembered that I have about six bottles of that Shell Oil in one of the compartments. I bet it's over ten years old! (Long story). I'm also betting I can't use that any more, right? And I wouldn't want to add any of it in top of whatever's in there now? (I have to check with the garage that changed the oil in March.)
As long as the containers are still sealed there should be no problem using them. But shake them to a fare-thee-well before opening.
__________________
WBCCI #1105
TAC LA-4

My Google-Fu is strong today.
Protagonist is offline   Reply With Quote
Old 10-21-2013, 06:47 AM   #14
CLOUDSPLITTER "Tahawas"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 11,153
Images: 1
Thumbs up

Quote:
Originally Posted by Punch View Post
Both your links are for 66-78 applications, apparently. Would these be right for mid-late 80's 454's? I have read elsewhere that these people are very knowledgeable and produce an excellent rebuilt.

SMI Carburetor Marine/Towing/RV/Off-Road Rochester Quadrajet 750CFM Towing / RV / OffRoad Rochester Quadrajets Rochester 4BBL Quadrajet 750CFM SMI- Sean Murphy Induction
Reputation/experience is everything. The best advise....call and make sure they are clear on your application. You can be pretty sure that the Q-jet on the MH is different than the one on a Vette. The same goes for any replacement you may be considering.

I built a 350 for our Jimmy years ago, the Holley replacement was a worthwhile up-grade, especially during our Bflo Winters.

Bob
__________________

__________________
PFC.....

“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
RLC
ROBERT CROSS is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:05 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.