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#1
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Jumpstarting fry ovp relay?
I recently jumpstarted my 87 300e and soon after I experienced a rough idle. My abs light would light up on a few occasions. I suspect this is my ovp. Could anyone tell me how to replace this fuse. I know it;s located somewhere behind the battery. Thanks
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#2
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The fuse, or fuses depending on which OVP you have, is mounted under the red cap on the OVP. Simple 10a blade fuses. Not sure where the OVP is located on your car.
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Mike Tangas '73 280SEL 4.5 (9/72)- RIP Only 8,173 units built from 5/71 thru 11/72 '02 CLK320 Cabriolet - wifey's mid-life crisis 2012 VW Jetta Sportwagon TDI...at least its a diesel Non illegitemae carborundum. |
#3
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If the ABS light would come on 'on a few occasions', I doubt you'll find the fuse bad. The OVP 'relay' itself is likely bad, and usually it is internal cracked solder joints. If you can solder, this problem is repairable, IF you can get the OVP case off. A consideration though is that an improper jump could have damaged the internal zener diodes - replacement would then be best.
Steve
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'91 MB 190E 2.3 '08 RAV4 Ltd 3.5 '83 Lazy Daze m'home 5.7 |
#4
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I missed the "on occasions" part. Blame speed reading.
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Mike Tangas '73 280SEL 4.5 (9/72)- RIP Only 8,173 units built from 5/71 thru 11/72 '02 CLK320 Cabriolet - wifey's mid-life crisis 2012 VW Jetta Sportwagon TDI...at least its a diesel Non illegitemae carborundum. |
#5
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Pull the OVP and shake it. If you hear rattling, it's bad - replace it.
This is not a conclusive test, but again, if you hear rattling when shaken, it's a goner.
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Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein" |
#6
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I pulled the ovp relay out and the fuse seems to be fine. I also shook the relay and no rattling sound. Is there any other way to tell if the relay is defective? My idle is still rough when put I put the transmission in drive and the rps houver around 500 rpm. Other symptoms include the occasional antilock brake light coming on and bad gas mileage. Please help.
Last edited by momentum; 09-12-2005 at 04:06 PM. |
#7
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Your OVP can be affected by jump starting, usually I think it's just the fuse though. Test the fuse in case it's damaged where you can't see it (this can happen).
Russell
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190E's: 2.5-16v 1990 90,000m Astral Silver 2.0E 8v 1986 107,000m Black 2nd owner http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg |
#8
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Quote:
Bad contact in the OVP - which powers the fuel control computer, ABS computer - will upset various things in loop control, such as the rotary idle air valve. Steve
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'91 MB 190E 2.3 '08 RAV4 Ltd 3.5 '83 Lazy Daze m'home 5.7 |
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