1989 Mercedes 300se

Tiny
WOODFORD
  • MEMBER
  • 1989 MERCEDES BENZ 300SE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
Engine turns over but will not start all the time. Sometimes it will start right away. May drive 1/4 of a mile then stop and then it is hard to start again. After driving for 7or8 miles will usually start the rest of the day. Help?
Saturday, January 8th, 2011 AT 11:51 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Next time it refuses to start don't wait for it to make up its mind-do below immediately to determine if its fuel or spark problem

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing.
Was this
answer
helpful?
Yes
No
+1
Monday, March 14th, 2011 AT 11:40 AM

Please login or register to post a reply.

Sponsored links