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1986 420sel Crank No-Start 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 cranks but, won't start & 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) & common sense (what little is left). MAINTENANCE PREVIOUSLY PERFORMED: Battery New Plugs New Wires New Belts New Oil & Filter Changed Trans Filter & Fluid New Rear Differential Fluid New F & R Shocks New Ins-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 (Single-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 03:56 AM. |
#2
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Measure the output of the crank sensor at the ignition module. Should create about 0.5V ac current while cranking.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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sounds like a classic case of dying crankshaft pickup[at the bellhousing on drivers side of centre].
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg |
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