Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-31-2016, 07:52 AM   #141
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
Nick, pictures are always nice to have. It's amazing what details can be gleaned from looking at pictures of someone else's coach.

Just yesterday I was looking at WayneG's TBI upgrade website and came across this picture of the front of his engine.

Click image for larger version

Name:	pic showing alternator adjusting screw.jpg
Views:	102
Size:	158.4 KB
ID:	259707

I had never seen an adjuster on the alternator like he has. Adjusting the alternator, especially while laying on top of the engine is a real pain. Having an adjuster just makes so much sense. Not sure if that is a factory item or home made but I plan on fabricating one and installing it while my engine is still on the test stand.

So in answer to your question, yes please post pictures!

Brad
__________________

__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is offline   Reply With Quote
Old 04-10-2016, 02:21 PM   #142
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
TBI set up in a 250 classic (1991)

Hi all,

Finally got Cosmo out this weekend and had a very enjoyable few days on Souther England's Jurassic Coast http://jurassiccoast.org/discover/ga...st/lyme-regis/ Highly recommended if you ever travel in the UK.

Anyhow, I also took the opportunity to have a look at the TBI set up. Here are some pictures and part reference numbers. It's all stock kit. There is very little (if any) clearance between the top of the air filter housing and the underneath of the dog house.

454 Big Block Gen V stamped with 10114182
GM ROCHESTER 7.4 454 TBI THROTTLE BODY 17091045
Injection Intake Manifold 10085698
Attached Thumbnails
Click image for larger version

Name:	IMG_2428.jpg
Views:	54
Size:	300.6 KB
ID:	260343   Click image for larger version

Name:	IMG_2429.jpg
Views:	58
Size:	345.0 KB
ID:	260344  

Click image for larger version

Name:	IMG_2430.jpg
Views:	59
Size:	340.5 KB
ID:	260345   Click image for larger version

Name:	IMG_2431.jpg
Views:	59
Size:	260.6 KB
ID:	260346  

__________________

__________________
Boom Sounds is offline   Reply With Quote
Old 04-10-2016, 02:37 PM   #143
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
TBI pictures

TBI pictures
Attached Thumbnails
Click image for larger version

Name:	IMG_2432.jpg
Views:	46
Size:	264.0 KB
ID:	260356   Click image for larger version

Name:	IMG_2433.jpg
Views:	55
Size:	304.4 KB
ID:	260357  

Click image for larger version

Name:	IMG_2434.jpg
Views:	54
Size:	276.9 KB
ID:	260358   Click image for larger version

Name:	IMG_2435.jpg
Views:	55
Size:	319.8 KB
ID:	260359  

__________________
Boom Sounds is offline   Reply With Quote
Old 04-10-2016, 02:56 PM   #144
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
TBI pictures

TBI pictures
Attached Thumbnails
Click image for larger version

Name:	IMG_2437.jpg
Views:	55
Size:	316.4 KB
ID:	260360   Click image for larger version

Name:	IMG_2438.jpg
Views:	46
Size:	267.7 KB
ID:	260361  

Click image for larger version

Name:	IMG_2440.jpg
Views:	49
Size:	313.6 KB
ID:	260362   Click image for larger version

Name:	IMG_2441.jpg
Views:	52
Size:	311.5 KB
ID:	260363  

__________________
Boom Sounds is offline   Reply With Quote
Old 04-10-2016, 04:55 PM   #145
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
All tied into a 454/4L80E with the obd1 diagnostics. Starts like a champ plus good fuel economy on cruise control with the overdrive.


Sent from my iPhone using Airstream Forums
__________________
Boom Sounds is offline   Reply With Quote
Old 04-11-2016, 12:31 PM   #146
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
Nick, thanks for the pictures! Looking at them in detail has explained a few things about where parts are mounted and most importantly how the cable bundles are routed.

It appears the main harness comes in from the left rear of the block which explains a lot about what I'm seeing with the aftermarket harness that I have purchased.

Thanks again!

Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is offline   Reply With Quote
Old 04-11-2016, 01:36 PM   #147
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
No worries Brad, just let me know if you need any more info.

As you can see, I need to get a refurb kit for it and replace the gaskets. Do you happen to know the best make? I am assuming AL Delco, but there look to be cheaper aftermarket options. What do you reckon? cheers
Nick
__________________
Boom Sounds is offline   Reply With Quote
Old 04-18-2016, 07:32 AM   #148
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
Quote:
Originally Posted by Boom Sounds View Post
No worries Brad, just let me know if you need any more info.

As you can see, I need to get a refurb kit for it and replace the gaskets. Do you happen to know the best make? I am assuming AL Delco, but there look to be cheaper aftermarket options. What do you reckon? cheers
Nick
Nick, why do you think the throttle body needs to be refurbished? Are you having any specific problems?

If it's running good I wouldn't mess with it!

If you have access to the PCM could you jot down the numbers and letters on the cover? The PCM should look something like this:
Click image for larger version

Name:	gm-pcm.jpg
Views:	49
Size:	190.6 KB
ID:	260938


Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is offline   Reply With Quote
Old 04-18-2016, 02:19 PM   #149
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
Hi Brad - I've got an intermittent problem with power loss. 99% of the time she is rock solid - never had a problem cruising down the Motorway. However, if I have pulled off the freeway and am running at a very slow speed, she can fail to pick up any power; I crawl at 10mph max. It usually clears after 10 mins of trying. I heard those TBI gaskets can fail giving rise to minor vacuum loss so thought I would try there. However, when I had a look last weekend I noticed the pre heater hose had failed and was totally loose, so will fix that first. When the power problem occurs, the check engine light comes on and the OBD1 throws up a 43 knock sensor error. It disappears again when the power picks up, so not a showstopper but annoying and I need to fix it before we head off for vacation to Italy because I have to drive through the French Alps.

Any thoughts on this?

Thanks
Nick



Sent from my iPhone using Airstream Forums
__________________
Boom Sounds is offline   Reply With Quote
Old 04-18-2016, 02:19 PM   #150
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
I'll have a look for that PCM ref this weekend.




Sent from my iPhone using Airstream Forums
__________________
Boom Sounds is offline   Reply With Quote
Old 04-18-2016, 03:37 PM   #151
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
Quote:
Originally Posted by Boom Sounds View Post
Hi Brad - I've got an intermittent problem with power loss. 99% of the time she is rock solid - never had a problem cruising down the Motorway. However, if I have pulled off the freeway and am running at a very slow speed, she can fail to pick up any power; I crawl at 10mph max. It usually clears after 10 mins of trying. I heard those TBI gaskets can fail giving rise to minor vacuum loss so thought I would try there. However, when I had a look last weekend I noticed the pre heater hose had failed and was totally loose, so will fix that first. When the power problem occurs, the check engine light comes on and the OBD1 throws up a 43 knock sensor error. It disappears again when the power picks up, so not a showstopper but annoying and I need to fix it before we head off for vacation to Italy because I have to drive through the French Alps.

Any thoughts on this?

Thanks
Nick

Sent from my iPhone using Airstream Forums
I just did some googling and found this statement:

A knock sensor code isn't always triggered by a defective knock sensor. It can be triggered by a malfunctioning EGR system, a lean air-to-fuel ratio, worn ignition components, a cooling system problem, or an engine mechanical problem.

My first guess would be the EGR system.

Brad
__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler is offline   Reply With Quote
Old 04-18-2016, 03:58 PM   #152
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
Thanks for that. Interestingly, Chris Claw was also having some unusual power issues with his TBI and his was caused by a collapsed EGR hose - I'll check there first.


Sent from my iPhone using Airstream Forums
__________________
Boom Sounds is offline   Reply With Quote
Old 04-18-2016, 04:04 PM   #153
Rivet Master
 
Boom Sounds's Avatar

 
1991 25' Airstream 250
Oxford , Oxfordshire
Join Date: Jun 2007
Posts: 706
Images: 5
Interesting that it only really happens from a stop or idle, which does indicate it might be related to EGR valve fault.

This from classic winni site;
EGR is considered a `metered intake leak' and was developed to reduce the combustion temperatures to below 2,500 degrees, the threshold where NOx is created. Not unlike putting a brick in your lavatory to lower the volume of water used, the EGR valve meters a readily available inert gas (actually exhaust gas which contains a lot of very inert Carbon Dioxide) into the combustion chamber to effectively reduce the volume. Smaller effective displacement means less fire, and less heat and thus lower temperatures, thereby controlling NOx emissions.

During full acceleration, the EGR valve is disabled to facilitate combustion and fill the combustion chambers, a set of conditions called wide open throttle (WOT). Were the EGR valve to be invoked during full acceleration, it would inhibit the acceleration by reducing the capacity of the fuel combustion chambers. At the other end of the scale, when the car is idling it is especially sensitive to the composition of air and fuel in the combustion chamber and therefore the EGR valve is turned off. Should the EGR valve still be in operation when the car is idle, the vehicle is likely to stall or stumble.

Typically the EGR system is made up of several components that control the operation over several situations so it isn't necessarily the EGR valve itself tha is the problem.



Sent from my iPhone using Airstream Forums
__________________
Boom Sounds is offline   Reply With Quote
Old 04-18-2016, 04:21 PM   #154
Rivet Master
 
bkahler's Avatar

 
1974 20' Argosy 20
Richmond , Kentucky
Join Date: Jan 2003
Posts: 6,350
That seems to match your symptoms pretty well.

Looks like you have a starting point to look for the problem.

Good luck!
__________________

__________________
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)
bkahler 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
03 tundra + 63 ambassador + 2000 miles= good idea? tjj's63 Tow Vehicles 12 11-05-2007 12:38 PM
My latest bad idea.... Boondocker Winterizing, Storage, Carports & Covers 3 11-01-2006 09:12 AM
Bad Bad Things... (a new 454 Engine?) pillageTHENburn Mechanics Corner - Engines, Transmission & More... 24 12-19-2005 01:49 PM
removing interior walls: bad idea? pinkflamingoes General Interior Topics 45 07-14-2004 09:18 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:26 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.