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  #1 (permalink)  
Old 01 Sep 2006, 08:29 pm
michalis0@gmail.com
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Default main relay vs ignition switch while driving

Hi,

When there is a problem with the ignition switch
the car can stop even after the engine has ignited.
(I 've experienced that already!)

Can the same thing happen when the main relay has gone
bad?

I am afraid my Honda Accord has a bad main relay.
After (if!) the engine starts, is it dangerous to drive it?
Can the car stop suddenly even while running, or a bad
main relay basically affects only the ignition process?

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  #2 (permalink)  
Old 02 Sep 2006, 11:32 am
Jim Yanik
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Default Re: main relay vs ignition switch while driving

michalis0@gmail.com wrote in
news:1157160596.754049.189120@i42g2000cwa.googlegr oups.com:

> Hi,
>
> When there is a problem with the ignition switch
> the car can stop even after the engine has ignited.
> (I 've experienced that already!)
>
> Can the same thing happen when the main relay has gone
> bad?
>
> I am afraid my Honda Accord has a bad main relay.
> After (if!) the engine starts, is it dangerous to drive it?
> Can the car stop suddenly even while running, or a bad
> main relay basically affects only the ignition process?
>
>


Generally,ordinary body vibrations keep the main relay working once the
motor has started running.(and that the car's interior is usually cooler
once you have it running)

A bad relay affects the fuel pressure available;that's why the failure
moded is often "starts then immediately quits,then only cranks,no
startup,until the car sits for several minutes".
The motor uses up the stored fuel pressure,then starves and quits because
the fuel pump is not running,because the relay is not powering it.

The fuel injectors need a pressurized fuel supply rail.

--
Jim Yanik
jyanik
at
kua.net
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  #3 (permalink)  
Old 03 Sep 2006, 10:22 am
michalis0@gmail.com
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Posts: n/a
Default Re: main relay vs ignition switch while driving

So if I understand well the car can die while driving,
when there is a problematic main relay?
(it affects not only the ignition process...)

TIA
michael

Jim Yanik wrote:
> michalis0@gmail.com wrote in
> news:1157160596.754049.189120@i42g2000cwa.googlegr oups.com:
>
> > Hi,
> >
> > When there is a problem with the ignition switch
> > the car can stop even after the engine has ignited.
> > (I 've experienced that already!)
> >
> > Can the same thing happen when the main relay has gone
> > bad?
> >
> > I am afraid my Honda Accord has a bad main relay.
> > After (if!) the engine starts, is it dangerous to drive it?
> > Can the car stop suddenly even while running, or a bad
> > main relay basically affects only the ignition process?
> >
> >

>
> Generally,ordinary body vibrations keep the main relay working once the
> motor has started running.(and that the car's interior is usually cooler
> once you have it running)
>
> A bad relay affects the fuel pressure available;that's why the failure
> moded is often "starts then immediately quits,then only cranks,no
> startup,until the car sits for several minutes".
> The motor uses up the stored fuel pressure,then starves and quits because
> the fuel pump is not running,because the relay is not powering it.
>
> The fuel injectors need a pressurized fuel supply rail.
>
> --
> Jim Yanik
> jyanik
> at
> kua.net


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  #4 (permalink)  
Old 03 Sep 2006, 11:59 am
Jim Yanik
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Posts: n/a
Default Re: main relay vs ignition switch while driving

michalis0@gmail.com wrote in
news:1157296923.272873.214700@e3g2000cwe.googlegro ups.com:

> So if I understand well the car can die while driving,
> when there is a problematic main relay?


No,it won't "die while driving".
Not with the typical main relay failure mode.

>> Generally,ordinary body vibrations keep the main relay working once
>> the motor has started running.(and that the car's interior is usually
>> cooler once you have it running)




> (it affects not only the ignition process...)
>
> TIA
> michael
>
> Jim Yanik wrote:
>> michalis0@gmail.com wrote in
>> news:1157160596.754049.189120@i42g2000cwa.googlegr oups.com:
>>
>> > Hi,
>> >
>> > When there is a problem with the ignition switch
>> > the car can stop even after the engine has ignited.
>> > (I 've experienced that already!)
>> >
>> > Can the same thing happen when the main relay has gone
>> > bad?
>> >
>> > I am afraid my Honda Accord has a bad main relay.
>> > After (if!) the engine starts, is it dangerous to drive it?
>> > Can the car stop suddenly even while running, or a bad
>> > main relay basically affects only the ignition process?
>> >
>> >

>>
>> Generally,ordinary body vibrations keep the main relay working once
>> the motor has started running.(and that the car's interior is usually
>> cooler once you have it running)
>>
>> A bad relay affects the fuel pressure available;that's why the
>> failure moded is often "starts then immediately quits,then only
>> cranks,no startup,until the car sits for several minutes".
>> The motor uses up the stored fuel pressure,then starves and quits
>> because the fuel pump is not running,because the relay is not
>> powering it.
>>
>> The fuel injectors need a pressurized fuel supply rail.
>>
>> --
>> Jim Yanik
>> jyanik
>> at
>> kua.net

>
>




--
Jim Yanik
jyanik
at
kua.net
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  #5 (permalink)  
Old 03 Sep 2006, 06:17 pm
jim beam
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Posts: n/a
Default Re: main relay vs ignition switch while driving

michalis0@gmail.com wrote:
> Hi,
>
> When there is a problem with the ignition switch
> the car can stop even after the engine has ignited.
> (I 've experienced that already!)
>
> Can the same thing happen when the main relay has gone
> bad?
>
> I am afraid my Honda Accord has a bad main relay.
> After (if!) the engine starts, is it dangerous to drive it?
> Can the car stop suddenly even while running, or a bad
> main relay basically affects only the ignition process?
>

kindly indicate the model and age and mileage - it helps a lot in giving
you the advice you seek.

usually, if it dies while driving, it's the ignition switch - main
relays prevent starting, but not running, in my experience at any rate.
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  #6 (permalink)  
Old 04 Sep 2006, 05:59 pm
Matt Ion
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Posts: n/a
Default Re: main relay vs ignition switch while driving

jim beam wrote:
> michalis0@gmail.com wrote:
>
>> Hi,
>>
>> When there is a problem with the ignition switch
>> the car can stop even after the engine has ignited.
>> (I 've experienced that already!)
>>
>> Can the same thing happen when the main relay has gone
>> bad?
>>
>> I am afraid my Honda Accord has a bad main relay.
>> After (if!) the engine starts, is it dangerous to drive it?
>> Can the car stop suddenly even while running, or a bad
>> main relay basically affects only the ignition process?
>>

> kindly indicate the model and age and mileage - it helps a lot in giving
> you the advice you seek.
>
> usually, if it dies while driving, it's the ignition switch - main
> relays prevent starting, but not running, in my experience at any rate.


The main relay, IIRC, controls both starter and injectors... an intermittant one
could most certainly affect running...
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  #7 (permalink)  
Old 04 Sep 2006, 07:36 pm
Jim Yanik
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Posts: n/a
Default Re: main relay vs ignition switch while driving

Matt Ion <soundy@moltenimage.com> wrote in
news:0d2Lg.502068$Mn5.43715@pd7tw3no:

> jim beam wrote:
>> michalis0@gmail.com wrote:
>>
>>> Hi,
>>>
>>> When there is a problem with the ignition switch
>>> the car can stop even after the engine has ignited.
>>> (I 've experienced that already!)
>>>
>>> Can the same thing happen when the main relay has gone
>>> bad?
>>>
>>> I am afraid my Honda Accord has a bad main relay.
>>> After (if!) the engine starts, is it dangerous to drive it?
>>> Can the car stop suddenly even while running, or a bad
>>> main relay basically affects only the ignition process?
>>>

>> kindly indicate the model and age and mileage - it helps a lot in
>> giving you the advice you seek.
>>
>> usually, if it dies while driving, it's the ignition switch - main
>> relays prevent starting, but not running, in my experience at any
>> rate.

>
> The main relay, IIRC, controls both starter and injectors... an
> intermittant one could most certainly affect running...
>


When you are driving,the interior is not as hot as when the car has been
closed up for awhile,and normal running vibrations keep the relay working.
No one here has ever reported having their main relay cut out their car -
while running-,only when it's been sitting,and more often in hot weather.

--
Jim Yanik
jyanik
at
kua.net
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  #8 (permalink)  
Old 04 Sep 2006, 10:09 pm
'Curly Q. Links'
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Posts: n/a
Default Re: main relay vs ignition switch while driving

Jim Yanik wrote:
> When you are driving,the interior is not as hot as when the car has been
> closed up for awhile and normal running vibrations keep the relay working.
> No one here has ever reported having their main relay cut out their car -
> while running, only when it's been sitting, and more often in hot weather.
>
> --
> Jim Yanik


-------------------------------

Precisely.

'Curly'
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  #9 (permalink)  
Old 04 Sep 2006, 10:37 pm
Matt Ion
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Posts: n/a
Default Re: main relay vs ignition switch while driving

Jim Yanik wrote:
> Matt Ion <soundy@moltenimage.com> wrote in
> news:0d2Lg.502068$Mn5.43715@pd7tw3no:
>
>
>>jim beam wrote:
>>
>>>michalis0@gmail.com wrote:
>>>
>>>
>>>>Hi,
>>>>
>>>>When there is a problem with the ignition switch
>>>>the car can stop even after the engine has ignited.
>>>>(I 've experienced that already!)
>>>>
>>>>Can the same thing happen when the main relay has gone
>>>>bad?
>>>>
>>>>I am afraid my Honda Accord has a bad main relay.
>>>>After (if!) the engine starts, is it dangerous to drive it?
>>>>Can the car stop suddenly even while running, or a bad
>>>>main relay basically affects only the ignition process?
>>>>
>>>
>>>kindly indicate the model and age and mileage - it helps a lot in
>>>giving you the advice you seek.
>>>
>>>usually, if it dies while driving, it's the ignition switch - main
>>>relays prevent starting, but not running, in my experience at any
>>>rate.

>>
>>The main relay, IIRC, controls both starter and injectors... an
>>intermittant one could most certainly affect running...
>>

>
>
> When you are driving,the interior is not as hot as when the car has been
> closed up for awhile,and normal running vibrations keep the relay working.
> No one here has ever reported having their main relay cut out their car -
> while running-,only when it's been sitting,and more often in hot weather.


True enough, but just because no-one has reported it here doesn't mean it
couldn't happen, or hasn't happened. The fact is, the main relay energizes the
injectors, and thus COULD cause a problem with the car running. And if one is
counting on "vibrations" to "keep the relay working", I'd be very concerned
about vibrations keeping it FROM working normally as well - such a device in a
car should be virtually impervious to vibrations, period.
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  #10 (permalink)  
Old 06 Sep 2006, 11:48 am
michalis0@gmail.com
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Posts: n/a
Default Re: main relay vs ignition switch while driving

Honda Accord '94, ~90K miles.
I changed already the ignition switch!

> kindly indicate the model and age and mileage - it helps a lot in giving
> you the advice you seek.
>
> usually, if it dies while driving, it's the ignition switch - main
> relays prevent starting, but not running, in my experience at any rate.


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