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Old 01-06-2005, 06:54 PM
Registered User
Join Date: Jun 2004
Location: South Louisiana
Posts: 48
420 Suddenly Dies

Hey Guys,

A weird thing has just started with my wife's 89 420 SEL.

So far it has died 5 times, and restarts instantly. This week, 4 times while the engine has run about 10 minutes, it suddenly dies, dead. It restarts instantly, no spiting or sputtering, starts and runs smooth as silk. Today whle driving for about an hour and doing about 35 mph it dies. She pulled over quickly and it starts instantly and ran for another hour till we got home without any problems.

It's weird, no dash light to say whats wrong. when it dies suddenly, there are no dash error lights. The most visible is the economy gauge which falls quickly, but thats all.

Any ideas?
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Old 01-06-2005, 09:20 PM
Registered User
Join Date: Dec 2003
Location: Rogersville, Missouri
Posts: 156

Search for fuel pump relay, ovp relay. Crystal ball says, Fuel pump relay
1987 190E-16v,
1988 260E Gone after 19 years of service,
2006 C280 4MATIC Gone to another
2006 OM647 Dodge (Mercedes) Sprinter
Time to find another car
29 years Mercede-Benz Technician, Retired Master Technician/Master Wrench
Master Guild Technician once/ SLR Technician Nine cars serviced
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Old 01-06-2005, 09:37 PM
Cigar Havana's Avatar
Registered User
Join Date: Jan 2003
Location: London Ontario Canada
Posts: 382
Just some Guesses

It could be loosing the spark, centre plug wire could be loose or broken. Coil wiring should be checked for loose wire. Another thought is the fuel relay, could it be loose, or loosing power? Also if that round plug that goes into the ezl in the drivers' side of the engine compartment, will make it stop. Electrical problems are sometimes simply fixed by rotating the fuses.
1989 420 SEL
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Old 01-06-2005, 11:56 PM
BenzMatic's Avatar
You can do it
Join Date: Jun 2003
Location: OC S. California
Posts: 120
It sounds like fuel pump relay, it is behind the firewall in the engine compartment.

87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)
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