[MBZ] 87 MBZ 420 SEL High RPM

2009-04-25 Thread 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? -- next part -- An HTML attachment was scrubbed... URL:

Re: [MBZ] 87 MBZ 420 SEL High RPM

2009-04-25 Thread 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

Re: [MBZ] 87 MBZ 420 SEL High RPM

2009-04-25 Thread 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

[MBZ] 420 SEL High RPM

2009-04-18 Thread 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. -- next part -- An HTML attachment was

Re: [MBZ] 420 SEL High RPM

2009-04-18 Thread 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

Re: [MBZ] 420 SEL High RPM

2009-04-18 Thread 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

Re: [MBZ] 420 SEL High RPM

2009-04-18 Thread 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 j...@windwireless.net wrote: The SRS light is on. Is there a way

[MBZ] 420 SEL High RPM

2009-04-17 Thread 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? -- next part -- An HTML attachment was scrubbed... URL:

Re: [MBZ] 420 SEL High RPM

2009-04-17 Thread 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

Re: [MBZ] 420 SEL High RPM

2009-04-17 Thread 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