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Old 09-03-2005, 19:01   #1 (permalink)
s m via CarKB.com
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1993 940 turbo fuel injector relay issues

Hi

My 940 Turbo (4 cyl automatic) *was* working great ... until I brought it
home from the seller's house :)

Apparently the car would start then when at the stop sign, it died and would
not start again. The car turns over and I was told it is likely the fuel
injector relay (button, switch, or whatever it is). Any ideas on how to
replace/repair it? Where is the fuel injector relay located? Is there a fuse
attached to it?

All ideas welcomed

TIA!!


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Old 09-03-2005, 19:01   #2 (permalink)
Boris Mohar
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Re: 1993 940 turbo fuel injector relay issues

On Sun, 04 Sep 2005 01:00:28 GMT, "s m via CarKB.com" <forum@CarKB.com>
wrote:

>Hi
>
>My 940 Turbo (4 cyl automatic) *was* working great ... until I brought it
>home from the seller's house :)
>
>Apparently the car would start then when at the stop sign, it died and would
>not start again. The car turns over and I was told it is likely the fuel
>injector relay (button, switch, or whatever it is). Any ideas on how to
>replace/repair it? Where is the fuel injector relay located? Is there a fuse
>attached to it?
>
>All ideas welcomed
>
>TIA!!



It is likely a fuel pump relay. This is a white relay behind the ashtray in
the center console. Remove it and if you are handy open pull it out of the
case noting the way it came out. You should resolder the circuit board that
holds two relays and you should also clean out the relay contacts. This can
be done by folding as sliver of fine abrasive paper so that both sides can
work the contacts. Hold the abrasive sliver with tweezers and work it in
between the contacts. Either that or spend $50.


Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca
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Old 09-03-2005, 23:01   #3 (permalink)
Randy G.
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Re: 1993 940 turbo fuel injector relay issues

Boris Mohar <borism_-void-_@sympatico.ca> wrote:

>On Sun, 04 Sep 2005 01:00:28 GMT, "s m via CarKB.com" <forum@CarKB.com>
>wrote:
>
>>Hi
>>
>>My 940 Turbo (4 cyl automatic) *was* working great ... until I brought it
>>home from the seller's house :)
>>
>>Apparently the car would start then when at the stop sign, it died and would
>>not start again. The car turns over and I was told it is likely the fuel
>>injector relay (button, switch, or whatever it is). Any ideas on how to
>>replace/repair it? Where is the fuel injector relay located? Is there a fuse
>>attached to it?
>>
>>All ideas welcomed
>>
>>TIA!!

>
>
>It is likely a fuel pump relay. This is a white relay behind the ashtray in
>the center console. Remove it and if you are handy open pull it out of the
>case noting the way it came out. You should resolder the circuit board that
>holds two relays and you should also clean out the relay contacts. This can
>be done by folding as sliver of fine abrasive paper so that both sides can
>work the contacts. Hold the abrasive sliver with tweezers and work it in
>between the contacts. Either that or spend $50.
>
>


Specifically, th VO;lvo relyas seem to have a penchant for cracked
solder joints inside of them. Remove the relay, then open the case.
Resolder each of the solder joints even if they look OK. If you don't
know how to solder, find a fried who does. It isn't difficult. See:
http://w6rec.com/duane/bmw/solder/

Generally, the contact points in a relay are plated. Once they get to
the point of needing to be sanded, they need to be replaced. What
happens is this- the contact points should be fairly flat with a large
contact area. Often they are nt. The electricity arcs between them,
and usually that's OK, but eventually the arcing canwear through the
plating, or foreign matter gets between them and becomes carbonized.
This can weld to the surface, or cause arcing on a very small ppint
that wears through the surfact of the opposite contact. Whatever the
case, the surface becomes pitted and the plating is lost. Once this
happens, sanding and burnishing can give the relay a bit more life,
but in all but the most benign cases, teh relay will eventuially fail
again, and at greater frequency the more it is done.

If the contact area looks ugly, try this- take a dollar bill and cut a
strip about 3/8" wide off one edge. wet it with WD40 and then rub in
some flour of pumice. it is a very fine abrasive. Then place this
between teh contacts and pull it through. Repeat until the contacts
are smooth and shiny. Clean the contacts up with alcohol to remove all
traces of the WD40 and pumice. But ifyou do this it would be best to
have a spare relay on order. You will probably need it- sooner or
later.

Bottom line- relays are a way for a small switch that can handle only
small electrical loads to turn on and off something that takes a high
current load. A relay does this mechanically with an electromagnet. A
better solution is a solid-state relay which can have a life span of
ten-fold or more over a mechanical relay. Hmm... I have a 10 amphere
one sitting right in front of me... Hmmm.... Off to look at the wiring
diagram! ;-)




__ __
Randy & \ \/ /alerie's
\__/olvos
'90 245 Estate - '93 965 Estate
"Shelby" & "Kate"
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