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Old 08-04-2009, 05:54 AM   #1
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Default what are the symptoms if my main relay is going bad?

i was curious what kinds of problems will show if the main relay starts to go bad.
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Old 08-04-2009, 06:25 AM   #2
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Default Re: what are the symptoms if my main relay is going bad?

Car won't start after parked for just a minute.
Car won't start when hot outside. Fuel injected PGMFI models only
Car starts but quickly dies as the rpm shoots to 1300 rpm.
Once started the car won't stall.
the symptoms return after shutting off the hot engine
No humming sound from the fuel pump the moment the ignition switches ON.
No click sound after the ignition key turns
10-15 of waiting and the car pushed to a shade will usually start.

http://techauto.awardspace.com/mainrelay.html

^ Great info on repairing the main relay and or everything you need to test yours out or even by-pass it.
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Old 08-04-2009, 06:47 AM   #3
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Default Re: what are the symptoms if my main relay is going bad?

i think the first 3 sound just like whats going on with mine.

the 4th one you listed doesnt make sense to me ?

thanks that really helps me out.

i think ill just buy a new one.
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Old 08-04-2009, 06:48 AM   #4
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Default Re: what are the symptoms if my main relay is going bad?

take yours out & resolder it, much cheaper
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Old 08-04-2009, 07:03 AM   #5
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Default Re: what are the symptoms if my main relay is going bad?

Once started the car won't stall.

Meaning that the solder contacts have melted onto another part of the board which keeps constant power going to the board instead of the power leaving when you turn the ignition off.

Re-soldering your old one > 45 bucks for a new one. The site I listed shows you everything to do to resolder it and what the connections should look like when you open it.
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Old 08-04-2009, 07:53 AM   #6
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Default Re: what are the symptoms if my main relay is going bad?

ok, i guess i have plenty of time right now. i can give it try.
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Old 08-04-2009, 01:49 PM   #7
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Default Re: what are the symptoms if my main relay is going bad?

just finished it. ill be testing if it changes behavior.

i removed all the old solder on each of the contact points.
then i gave it a ton of soilder on the top of each point.
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Old 08-18-2009, 07:52 AM   #8
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Default Re: what are the symptoms if my main relay is going bad?

Ive had simular problems like this and i am planning on resoldering my main relay as well. I was just curious what your turnout was?
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Old 08-19-2009, 05:52 AM   #9
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Default Re: what are the symptoms if my main relay is going bad?

i dont think i noticed much of a difference. im still having problem starting up.
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Old 08-19-2009, 07:05 AM   #10
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Default Re: what are the symptoms if my main relay is going bad?

Quote:
Originally Posted by dephtone View Post
Car won't start after parked for just a minute.
Car won't start when hot outside. Fuel injected PGMFI models only
Car starts but quickly dies as the rpm shoots to 1300 rpm.
Once started the car won't stall.
the symptoms return after shutting off the hot engine
No humming sound from the fuel pump the moment the ignition switches ON.
No click sound after the ignition key turns
10-15 of waiting and the car pushed to a shade will usually start.

http://techauto.awardspace.com/mainrelay.html

^ Great info on repairing the main relay and or everything you need to test yours out or even by-pass it.
Good post.

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i dont think i noticed much of a difference. im still having problem starting up.
What are your symptoms. Is it just cranking for a long time before starting?
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Old 08-25-2009, 04:47 PM   #11
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Default Re: what are the symptoms if my main relay is going bad?

Mine is acting the same way..after I replaced the main relay it started fine once and ran. Then it shut off and would only crank but not turn over?? And it doesnt struggle before it dies.
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Old 08-25-2009, 07:31 PM   #12
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Default Re: what are the symptoms if my main relay is going bad?

I could remove my main relay and tap on it a couple time and my car would start right up and that's how i knew it was the main relay i could actually feel it click in my hand
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Old 05-01-2013, 02:03 PM   #13
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Default Re: what are the symptoms if my main relay is going bad?

i kno this is a 09 post but with a bad relay would the pump stop working .. or after the car dies no humming after the first turn of the key?
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Old 05-08-2013, 10:43 PM   #14
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Default Re: what are the symptoms if my main relay is going bad?

not sure. maybe take a video and show us what you got going on.
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Old 05-09-2013, 11:24 AM   #15
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my car has problems too. i switch to ignition and it just cranks and cranks and cranks. then it slowly starts to stutter like barely getting fuel then slowly a little more then it cuts on... and when I'd break harsh on. stop sign . it just shuts off...
now it won't turn on at all will just crank and crank...
if any help please do!!


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Old 06-13-2013, 01:46 PM   #16
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Default Re: what are the symptoms if my main relay is going bad?

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my car has problems too. i switch to ignition and it just cranks and cranks and cranks. then it slowly starts to stutter like barely getting fuel then slowly a little more then it cuts on... and when I'd break harsh on. stop sign . it just shuts off...
now it won't turn on at all will just crank and crank...
if any help please do!!


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I have the same issue with mine..
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Old 06-13-2013, 04:34 PM   #17
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Default Re: what are the symptoms if my main relay is going bad?

Are you guys getting spark? Check possibly
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Old 06-13-2013, 07:22 PM   #18
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Default Re: what are the symptoms if my main relay is going bad?

I had spark on every plug
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Old 06-13-2013, 07:42 PM   #19
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as do I. but I believe my problem might be my timing belt/chain. its lose on one side. tight on the other.


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Old 06-14-2013, 10:48 AM   #20
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Default Re: what are the symptoms if my main relay is going bad?

bump as this is some good info to kno
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Old 06-14-2013, 08:41 PM   #21
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Default Re: what are the symptoms if my main relay is going bad?

When my main relay went bad. .My car slugged at the start. then started to slug more and more.. till i got tired of the fact that it might not start took out the main relay smelled it (smelled burnt) Bought a new one. fixed the problem.
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Old 06-14-2013, 08:58 PM   #22
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I tried 3 relays. including my own.

1 different ecu mpfi obd0 integra pr4 ecu.

changed my injectors to d15b7 then to another set from eBay I bought meant for d16a6.

changed fuel filter. new.

I hear fuel pump hum kicking in.

I tried hand over manifold with Carb cleaner inside.
started but then died was idling during process.

and I noticed my timing belt is sorta loss by my thought it should be really tight. so I'm trying that next.
so far nothing has worked.

any ideas would be great!


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Old 06-14-2013, 09:46 PM   #23
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Default Re: what are the symptoms if my main relay is going bad?

Quote:
Originally Posted by Z0831xiz View Post
I tried 3 relays. including my own.

1 different ecu mpfi obd0 integra pr4 ecu.

changed my injectors to d15b7 then to another set from eBay I bought meant for d16a6.

changed fuel filter. new.

I hear fuel pump hum kicking in.

I tried hand over manifold with Carb cleaner inside.
started but then died was idling during process.

and I noticed my timing belt is sorta loss by my thought it should be really tight. so I'm trying that next.
so far nothing has worked.

any ideas would be great!


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Your car isnt starting?
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Old 06-14-2013, 10:14 PM   #24
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nope I changed or check all those things still doesn't start


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Old 06-14-2013, 10:17 PM   #25
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Default Re: what are the symptoms if my main relay is going bad?

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nope I changed or check all those things still doesn't start


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Whats the start sound like.. or lack of start?
I mean does it slug, just clicks? i mean the sound helps quit a bit.
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