[W126 Coupe] Off topic 190E 2.6

[Steve Lemberg]

Ian,

In a word No, the EZL is what sets the timing.    You can test the initial timing with the EZL in place and see what it is, to confirm that the timing is off.   Any timing light will work if the coil is firing.    Initial advance on cranking I would guess to be about 15-20 degrees before TDC.    The other thing to check is the crank sensor, it should be ruled out as the cause.    Check the core to ground and shield, you should have open on both.   

Steve
  ----- Original Message ----- 
  From: Iain Gunn 
  To: Mercedes Coupes Mailing Lists 
  Sent: Wednesday, January 02, 2008 6:58 PM
  Subject: Re: [W126 Coupe] Off topic 190E 2.6


  I cleaned up everything and still the same. I've ordered a EZL to swap out. 
  In the meantime is there a way to turn the motor over by hand with the ignition on, the plugs pulled and test without any fancy equipment at what point the plug fires? Using test lights and multi meter?
      Thanks, Iain
    ----- Original Message ----- 
    From: Steve Lemberg 
    To: Mercedes Coupes Mailing Lists 
    Sent: Saturday, December 29, 2007 1:17 PM
    Subject: Re: [W126 Coupe] Off topic 190E 2.6


    Ian,

    The EZL controls advance and dwell functions.   As these cars age more issues arise with the electronic parts, I would also check the ground points near the battery for the engine wiring harness.   There is also a resistor for the EZL that limits the advance, this may have failed.   Clean the plugs, they may be gas fouled.    A timing chain skip on an inline engine is unlikely, not impossible but unlikely.

    Steve
      ----- Original Message ----- 
      From: Iain Gunn 
      To: mbcoupes at mbcoupes.com 
      Sent: Saturday, December 29, 2007 2:19 AM
      Subject: [W126 Coupe] Off topic 190E 2.6


      Gentlemen, I have a bit of a quandary that I thought the mass knowledge of this group may have some insight.
      My daughters 190E 2.6 will not start.
      Here's what happened: the car sat for a week and I went and started the car and it started and ran fine for about 25 minutes. I went to move the car , put it in reverse and the tires were frozen, gave a bit of gas and it stalled, would not start at that point. When it turns over it won't catch and it sounds like either its hydraulicing or way too much ignition advance. When I remove the coil wire it turns over normally.
      I pulled the plugs, turned the engine by hand to TDC, as indicated by the markings on the harmonic balancer, #1 piston was at TDC and the rotor is pointing to #1 firing position. On the 190 the trigger for ignition is on the balancer, ( there's a proxy there with a pin sticking out of the balancer.)
      Its sounds like a jumped timing chain, but this does not indicate so.
      I have also inspected all the pistons for water, as 2.6's have a habit of blowing head gaskets, all OK. All cylinders are getting spark, I have fuel pressure. 
      Last thing I did was pore some gas down though the throttle body and turned the engine over, it flashed back through the throttle body. This usually indicates, too much ignition timing or a jumped timing chain.
      I'm now stumped. What else can influence the ignition timing? Back in the old days, you would back off the distributor, but as you know, this will not change the timing on these cars.

      Any help or thoughts would be greatly appreciated.
                          Thanks, and happy new year.
                                                                          Iain
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