1995 C280

[TOM77]

hi!

I am having a problem with my 1995 C280 , sometimes it cranks but dosent start, i hear the fuel pump working but i took one of the wires off one of the coils and i got no spark when i crancked!! so it;s spark related i am pretty sure. has anyone had a similar problem?

[psfred]

Has the wiring harness been replaced -- this is a warrenty thing, I think (bad insulation)?

Otherwise, likely a bad TDC sensor (rear of engine) or a bad ignition unit, possibly bad coil(s) or wires.

Peter

[TOM77]

i dont get spark at any coil, so its not the coils .. what are the chances of all the coils going at once, would the TBC sensor cause no spark? how about the crank sensor? and what part of the harness goes? what area should i look for a bad harness wire?

[TOM77]

anyone !!!

[Arthur Dalton]

O.V.P. Relay.......................

[TOM77]

what is the O.V.P relay? where is it located? does it cut off spark?

[manny]

Maybe this will help.
http://www.classic-roadster.de/cgi-bin/showitemlocation.cgi?TYPE=W202&X=7&Y=6&SORT=ITEM&START=K&ITEM=K1

[TOM77]

thanx for the link. so what does O.V.P stand for? and how much are those relays?

[Arthur Dalton]

Originally Posted by TOM77

thanx for the link. so what does O.V.P stand for? and how much are those relays?

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1M30LAGSC1S80C4YGQ&year=1995&make=MB&model=C-280-001&category=P&part=Overload+Relay


Use the SEARCH feature

There is enough info there to fill a phone book.

[Ali Al-Chalabi]

Overvoltage protection relay (or something like that).

If the wiring harness is bad and has not yet been replaced, the chances are slim of getting a goodwill replacement from Mercedes anymore.

[Arthur Dalton]

Originally Posted by Gilli

I am having the same problem. The car cranks but won't turn over. This will happen sometimes 5 or 6 times in a row untill the engine fires up. I have had the wiring harness, engine cable, fuel pressure regulator, and the fuel pump relay all replaced, the fuel pump was not coming on with ignition truned on so had the connections from relay to ecm cleaned. The car has 71,118 mostly highway miles. They are now telling me the computer needs to be replaced!

OVP

[Gilli]

A Dalton: I can't access the search in the link you mentioned earlier. how do I find the information I need on this part? There are 2 parts listed with the same number but different prices. Which one do I need to order? Thanks for your Help!

[Arthur Dalton]

Originally Posted by Gilli

A Dalton: I can't access the search in the link you mentioned earlier. how do I find the information I need on this part? There are 2 parts listed with the same number but different prices. Which one do I need to order? Thanks for your Help!

They are the same, just different Brands

Go here and read thread #11

http://cgi.ebay.com/ebaymotors/MERCEDES-230SL-250SL-280SL-250-280-SL-BOSCH-FUEL-POMP_W0QQcmdZViewItemQQcategoryZ10076QQitemZ4632880588QQrdZ1

[brookspw]

Crank sensor. My 94 did the exact same last week.

[Arthur Dalton]

Originally Posted by brookspw

Crank sensor. My 94 did the exact same last week.

That is also a possible..
Next time it does not start, give the OVP a few taps with a screwdriver handle and retry,,
Both of these items effect ignition, so either will have the same symptoms..............
The crank sensor can be detected with a scope, but that will take a Tech.