A Giblet of Friendly Advice - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 08-01-2006, 07:20 PM   #1
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
A Giblet of Friendly Advice

If something is starting to malfunction that can be damaged by heat, don't put off it's repair/replacement.

My damn main relay wen't completely today while I was on the way to my best friend's house. Ended up down a hill quite away from the house in 100 degree weather pushing the car with all my might. A cop even passed me but didn't offer help.

After stumbling inside out of breath and drenched with sweat I have vowed not to put off things that'll get broken in intense heat.

!
__________________

SVOboy is offline   Reply With Quote
Old 08-02-2006, 02:28 AM   #2
Registered Member
 
krousdb's Avatar
 
Join Date: Feb 2006
Posts: 1,480
Country: United States
Location: Raleigh, NC
Yes, I replaced mine as soon as the GS community diagnosed the problem. I have the old one still. I garuntee it will work intermittantly until it fails completely. I will send it to you free of charge.
__________________

__________________


krousdb is offline   Reply With Quote
Old 08-02-2006, 06:34 AM   #3
Registered Member
 
Compaq888's Avatar
 
Join Date: Oct 2005
Posts: 1,460
Country: United States
What does this part do exactly???

Because all of us own hondas so it might be of interest to me.
__________________

Compaq888 is offline   Reply With Quote
Old 08-02-2006, 07:05 AM   #4
Moderator
 
GasSavers_DaX's Avatar
 
Join Date: Oct 2005
Posts: 1,209
Country: United States
OBD-0 Main Relay strikes again!!!

Compaq - the main relay supplies power to vital components in the car - most importantly the fuel pump. When you turn your ignition to the 'ON' position, the main relay gets power from the ignition switch and in turn gives power to the fuel pump.

OBD-0 cars (88-91 civics and 4th gen accords) are plagued with main relays with poor solder connections - it's actually a result of a poor manufacturing process. Over the years of heating and cooling (expanding and contracting) of the soldered joints, the solder cracks. I took apart my old main relay and saw this for myself. Once the solder cracks, the trouble begins. On cool days, everything is fine because the joints are making a decent connection. On hot days, the heat causes the joints to expand giving an intermittent connection. This causes 'no-start' or 'shut-off' conditions, mainly when the fuel pump loses power due to the main relay.

If you are experiencing this problem, you should replace the main relay immediately, but in the mean time, I recommend rolling down all your windows and giving your car about 10 minutes, then trying to crank it. Usually this will allow the main relay to cool down enough to start.

For reference, the main relay is under the dash bolted to the inside driver's side of the car...right near the hood release handle.
GasSavers_DaX is offline   Reply With Quote
Old 08-02-2006, 07:46 AM   #5
Registered Member
 
GasSavers_brick's Avatar
 
Join Date: Mar 2006
Posts: 162
Country: United States
Another option for someone who is good with a soldering iron is to re-solder an intermittently working relay. It takes some skill but works pretty well. I've been through this with old Volvo relays...exact same problem with thermal effects and cracking. In their case it was necessary to re-solder the contact points as well as trace the electrical paths on the PCB...I wasn't always successful.
__________________
'07 Toyota Prius
GasSavers_brick is offline   Reply With Quote
Old 08-02-2006, 07:51 AM   #6
Moderator
 
GasSavers_DaX's Avatar
 
Join Date: Oct 2005
Posts: 1,209
Country: United States
Quote:
Originally Posted by brick
Another option for someone who is good with a soldering iron is to re-solder an intermittently working relay. It takes some skill but works pretty well. I've been through this with old Volvo relays...exact same problem with thermal effects and cracking. In their case it was necessary to re-solder the contact points as well as trace the electrical paths on the PCB...I wasn't always successful.
I consider myself pretty good with a soldering iron. I tried this and still messed it up. It is an option, but a new one is only about $40. I actually ended up frying some AC components (how I don't know) by doing this. It is an option, just understand the risk.
GasSavers_DaX is offline   Reply With Quote
Old 08-02-2006, 07:58 AM   #7
Registered Member
 
Join Date: Apr 2006
Posts: 270
Country: United States
Send a message via AIM to molecule
whats a damn giblet...???
lol
__________________
BE ZEITGEISTED
molecule is offline   Reply With Quote
Old 08-02-2006, 08:45 AM   #8
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
A giblet must be something you are too young to understand!

Dax - thank you for the wonderful analysis of it. I'm just going to resolder mine. Would Dan's spare work for me or are the plugs/operation different for obd1 stuff?
SVOboy is offline   Reply With Quote
Old 08-02-2006, 08:48 AM   #9
Moderator
 
GasSavers_DaX's Avatar
 
Join Date: Oct 2005
Posts: 1,209
Country: United States
Quote:
Originally Posted by SVOboy
Dax - thank you for the wonderful analysis of it. I'm just going to resolder mine. Would Dan's spare work for me or are the plugs/operation different for obd1 stuff?
Good luck with the solder. I think where I screwed up is that some of the solder dripped under the PCB and into the coil or something. If you do solder, I would say use as little solder as possible and do it inverted (this is how the board is soldered in the factory).

I'm not sure if OBD-1 main relays will work with OBD-0. Have you checked HondaAutomotiveParts.com to compare part numbers?
GasSavers_DaX is offline   Reply With Quote
Old 08-02-2006, 08:50 AM   #10
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
I'll do mine before I bug dan on his. I was gonna do it last night but by the time I got home I was too damn tired to care.
__________________

SVOboy is offline   Reply With Quote
Reply

Thread Tools
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
Suggestions from a Newbie juha Fuelly Web Support and Community News 6 10-03-2012 08:03 AM
More proof of a conspiracy Sludgy General Fuel Topics 48 07-01-2009 08:18 AM
More Fuel Saving Tip Suggestions jklaiber General Fuel Topics 1 08-11-2008 11:03 AM
Convertible Honda CVCC Matt Timion General Discussion (Off-Topic) 10 11-07-2005 02:54 PM
Teggy, Telly, and a Lead Foot rh77 Introduce Yourself - New member Welcome 5 10-22-2005 06:22 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 04:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.