Re: [MBZ] 87 MBZ 420 SEL High RPM

[Kaleb C. Striplin]

That I dont know, its possible it also has some problem with the SRS 
although I have not had to diagnose that myself before.


Ken Rushing wrote:

I replaced the overvoltage relay and it seems to have fixed the high rpm.
Thanks for the advice! The SRS light is still illuminated. Is there a reset
button or is something else wrong that I should address?
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Kaleb C. Striplin/Claremore, OK
 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E,
 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D,
 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D,
http://www.okiebenz.com

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Re: [MBZ] 87 MBZ 420 SEL High RPM

[Jim Cathey]

I replaced the overvoltage relay and it seems to have fixed the high 
rpm.
Thanks for the advice! The SRS light is still illuminated. Is there a 
reset

button or is something else wrong that I should address?


Sadly, B.  My 560SL had that light lit, and ultimately it turned
out to be bad capacitors in the energy accumulator.  (They used some
external capacitors for a year or two.)

-- Jim



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[MBZ] 87 MBZ 420 SEL High RPM

[Ken Rushing]

I replaced the overvoltage relay and it seems to have fixed the high rpm.
Thanks for the advice! The SRS light is still illuminated. Is there a reset
button or is something else wrong that I should address?
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Re: [MBZ] 420 SEL High RPM

[John Freer]

Oh yeah, one other thing. Try not to drive the car in stop and go
traffic until you get this fixed as the stress on the tranny will
cause high heat and ultimate failure. Big bucks.
John

On Sat, Apr 18, 2009 at 9:59 AM, Jim Cathey  wrote:
>> The SRS light is on. Is there a way to test the overvoltage relay? or idle
>> computer or actuator?
>
> You just did.  Nothing taking power from the overvoltage
> relay is working right.
>
> Replace its fuse, and at least try re-seating the relay.
> That alone may do it.
>
> These older OVP relays are pretty simple inside, the
> metal cover slips off and you can see what's inside.
> I've seen bad solder joints in those, too.  There's
> a big 18V Zener diode in there whose job it is to blow
> the fuse and un-power the relay, if power goes out of
> its tolerable limits.  Not much to go wrong, and not much
> to fix, either.
>
> -- Jim
>
>
>
> ___
> http://www.okiebenz.com
> For new and used parts go to www.okiebenz.com
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Re: [MBZ] 420 SEL High RPM

[Jim Cathey]

The SRS light is on. Is there a way to test the overvoltage relay? or 
idle

computer or actuator?


You just did.  Nothing taking power from the overvoltage
relay is working right.

Replace its fuse, and at least try re-seating the relay.
That alone may do it.

These older OVP relays are pretty simple inside, the
metal cover slips off and you can see what's inside.
I've seen bad solder joints in those, too.  There's
a big 18V Zener diode in there whose job it is to blow
the fuse and un-power the relay, if power goes out of
its tolerable limits.  Not much to go wrong, and not much
to fix, either.

-- Jim



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Re: [MBZ] 420 SEL High RPM

[Kaleb C. Striplin]

If the SRS light is on, then its the overvoltage relay.  Its going to be 
the relay with the little flip up door and the fuse on top of it (red) 
between the 2 firewalls.  Check the fuse, otherwise replace the relay.


Ken Rushing wrote:

The SRS light is on. Is there a way to test the overvoltage relay? or idle
computer or actuator?




does the SRS light come on at the same time?  If so, its the overvoltage

relay.  If not, probably the idle computer or actuator.
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--
Kaleb C. Striplin/Claremore, OK
 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E,
 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D,
 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D,
http://www.okiebenz.com

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[MBZ] 420 SEL High RPM

[Ken Rushing]

The SRS light is on. Is there a way to test the overvoltage relay? or idle
computer or actuator?



>does the SRS light come on at the same time?  If so, its the overvoltage
relay.  If not, probably the idle computer or actuator.
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Re: [MBZ] 420 SEL High RPM

[Kaleb C. Striplin]

does the SRS light come on at the same time?  If so, its the overvoltage 
relay.  If not, probably the idle computer or actuator.


Ken Rushing wrote:

My son has an '87 420 SEL and once started, RPM's reach 2000 at idle within
4 seconds. The linkage isn't bound and does not appear to have even moved
once started. Where should I begin?
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--
Kaleb C. Striplin/Claremore, OK
 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E,
 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D,
 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D,
http://www.okiebenz.com

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Re: [MBZ] 420 SEL High RPM

[Peter Frederick]

Idle control valve -- about have the size of a coke can, connected to  
the air meter horn boot at the rear of the manifold (bottom half,  
it's sorta buried).


Make sure it's connected and the hoses are intact.

You should also pull the codes from the computer to see what if any  
error codes are stored.


Peter

On Apr 17, 2009, at 9:51 PM, Ken Rushing wrote:

My son has an '87 420 SEL and once started, RPM's reach 2000 at  
idle within
4 seconds. The linkage isn't bound and does not appear to have even  
moved

once started. Where should I begin?
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[MBZ] 420 SEL High RPM

[Ken Rushing]

My son has an '87 420 SEL and once started, RPM's reach 2000 at idle within
4 seconds. The linkage isn't bound and does not appear to have even moved
once started. Where should I begin?
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