Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-13-2004, 05:19 PM   #15
RivetAddict
 
swebster's Avatar
 
1986 34.5' Airstream 345
Louisville , Kentucky
Join Date: Feb 2003
Posts: 1,861
Images: 4
nice looking 345. but to me every 345 is a work of art
__________________

__________________
Steven Webster
1986 Airstream 345 Classic Motorhome
AIR 1760
swebster is offline   Reply With Quote
Old 05-26-2009, 09:41 PM   #16
3 Rivet Member
 
Auretrvr's Avatar
 
1983 31' Airstream310
Iowa City , Iowa
Join Date: Aug 2006
Posts: 230
454 Starts fine, stops and won't start when warm

I'm thanking our lucky stars this happened at home and not while we were on the road!

We just got back from a 2,000 mile trip in our '83 310 (Ernestine). I filled her with gas and parked for a couple of days after we got back.

This morning I started it to warm up for a trip to the shop, and she died after about 10 minutes.

I'm a little spooked by this because I just put a bottle of Sta-Bil in the gas tank the other day. But my Onan Generator is running just fine on the same gas as the chassis engine.

The 454 starts, runs maybe 5 minutes and stops. After it sits for a bit I can start it again but it again stalls out. Once it has warmed up, it only runs for a very short time -- 10-15 seconds -- before it quits.

I connected a hose to the fuel line at the carburetor and watched it rapidly pump gas into a bottle. When it stalls I can pump the accelerator and see it shoot gas into the carb but it doesn't affect the stall.

I did check for spark but maybe I waited too long after it stalled, because it had spark when I checked it. I will redo that test.

I followed a mechanic's advice and replaced the manual fuel pump. No change.

Does the electric fuel pump normaly run slower once it has built up pressure? Mine never slows down. This could mean a bad pump or leaking tank line, right?

Would a bad coil suddenly start failing when warm? Would it be a very consistent failure, as though it were just shutting off at a certain temperature every time?

Seems like a case of having gas and spark but maybe not enough or not all the time!

Thanks!
__________________

__________________
Airstream OCD...there is no cure!
1983 Classic 310 Motorhome.
AIR 15765

Auretrvr is offline   Reply With Quote
Old 05-26-2009, 11:03 PM   #17
Rivet Master
 
59toaster's Avatar
 
1959 22' Caravanner
Atlanta , Georgia
Join Date: Feb 2003
Posts: 2,197
Images: 22
Quote:
Originally Posted by Auretrvr View Post
I'm thanking our lucky stars this happened at home and not while we were on the road!

We just got back from a 2,000 mile trip in our '83 310 (Ernestine). I filled her with gas and parked for a couple of days after we got back.

This morning I started it to warm up for a trip to the shop, and she died after about 10 minutes.

I'm a little spooked by this because I just put a bottle of Sta-Bil in the gas tank the other day. But my Onan Generator is running just fine on the same gas as the chassis engine.

The 454 starts, runs maybe 5 minutes and stops. After it sits for a bit I can start it again but it again stalls out. Once it has warmed up, it only runs for a very short time -- 10-15 seconds -- before it quits.

I connected a hose to the fuel line at the carburetor and watched it rapidly pump gas into a bottle. When it stalls I can pump the accelerator and see it shoot gas into the carb but it doesn't affect the stall.

I did check for spark but maybe I waited too long after it stalled, because it had spark when I checked it. I will redo that test.

I followed a mechanic's advice and replaced the manual fuel pump. No change.

Does the electric fuel pump normally run slower once it has built up pressure? Mine never slows down. This could mean a bad pump or leaking tank line, right?

Would a bad coil suddenly start failing when warm? Would it be a very consistent failure, as though it were just shutting off at a certain temperature every time?

Seems like a case of having gas and spark but maybe not enough or not all the time!

Thanks!
It's the Choke.
It's not opening.
GM wires the choke through a oil pressure switch so that the choke only gets power when the engine is actually running. This is to prevent a hard start if you turn the key to run and don't actually start the motor.

When it is cold start the motor with the air cleaner off. Hook a Volt meter to the choke wire and verify that when it starts it gets 12v once it starts and has oil pressure. If it gets 12v then the element has failed. If it doesn't get power trace it back to the oil pressure switch and check for power there. No power start looking for blown fuses.

On a 350 the switch is in a oil port right behind the distributor. My 454 is Fuel injected so not sure it where they put the switch. It may be down on the driver side of the block right above the oil pan up near the front of the motor. That's where the fuel pump switch and sender for the gage is.

You should also see the choke open as the motor warms from cold when the choke is plugged in.
__________________
1959 22' Caravanner
1988 R20 454 Suburban.
Atlanta, GA
59toaster is offline   Reply With Quote
Old 05-27-2009, 11:33 AM   #18
3 Rivet Member
 
Auretrvr's Avatar
 
1983 31' Airstream310
Iowa City , Iowa
Join Date: Aug 2006
Posts: 230
It was the ignition module!

This was a lesson in troubleshooting discipline.

I did check for spark, but not until after the module had cooled down some--so it was working again. This morning I tested immediately after the engine stopped and there was NO spark.

$20 at Advance Auto Parts and I'm on the road again!

Lesson learned: The way I described my problem to the mechanic led him to suspect fuel problems ahead of electrical.

The GM HEI ignition apparently had a reputation for this type of problem but today's mechanics don't see that much of 25 year old motor homes!
__________________

__________________
Airstream OCD...there is no cure!
1983 Classic 310 Motorhome.
AIR 15765

Auretrvr 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine Revving Problem winner Mechanics Corner - Engines, Transmission & More... 19 02-08-2010 11:05 PM
Engine Oil Question ViewRVs Mechanics Corner - Engines, Transmission & More... 12 05-25-2008 09:45 AM
454 engine questions Curtis-79MH Mechanics Corner - Engines, Transmission & More... 10 10-06-2003 07:22 AM
Electrical problem resolved davidz71 Electrical - Systems, Generators, Batteries & Solar 5 08-12-2002 09:21 PM
Engine Monitoring, gauges etc. thenewkid64 Mechanics Corner - Engines, Transmission & More... 1 07-25-2002 03:25 PM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:45 PM.


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.