S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

86 420sel Crank NoStart Problem

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Old 04-30-2008, 11:01 PM
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86' 420sel & 91' 300E
86 420sel Crank NoStart Problem

Hey Buddies:
1986 420sel 177k Crank - Nostart condition present!

Problem started with cutoff when at Stop! Restarts & drives fine, then cuts off at stop again!! Now cranks but won't start! Suspected FUEL PUMP RELAY! Jumped Fuel Pump & started okay! Idle fine!!

Replaced FP-Relay w/ good used, now won't crank & has heavier than normal fuel smell present!! Cranked until battery now completely discharged.

Suspect CPS / TDC Sensor but, NEED / WANT VALUED OPINION 1st!!!!
No SHOP Diag TOOLS available. Using DMM, Test-Light, Vacuum Gauge(s) & commsense (what little is left)!!

MAINTENANCE PERFORMED:
Battery New
Plugs New
Wires New
Belts New
Oil & Filter Changed
Trans Filter & Fluid New
Rear Differentail Fluid New
F & Shocks New
Inst-Cluster Rheostat New
Oil Pan & Pickup-Strainer New
Cap & Rotor New
L & R Lower Ball Joints New
L & R Front Wheel Bearings New
ACC Mono Valve Insert New
Temp Sensor (2-Pole) New
OVP & 10Amp Fuse (Replaced w/ good used)
Idle Control Unit Good (Replaced w/ good used)
Idle Control Valve Good
Fuel Pumps & O-Rings (both) New
Fuel Filter & O-Rings New
Coolant System Flushed & Replaced w/ Dexcool
Air Filter New
Fuel Pump Relay (Replaced with GOOD USED)
Vacuum Leak(s) Corrected

Opinions & Suggestions please............
RSVP,
TerryJ

Last edited by tbjcc001; 05-01-2008 at 12:34 AM.

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