[W126 Coupe] Off topic 190E 2.6

[Dick Spellman]

Iain,

I would pull the cylinder cover and  see what position the valves are in 
(i.e., intake and exhaust cam lobes on #1 should be both be up-valves 
closed)  with the harmonic balancer at TDC for #1.  Then hand rotate 
through the firing order to see what position other cylinder valves are 
in as you go through the firing order.  There may also be some signs of 
trouble on the rails, slack chain or the cam sprocket teeth that will 
indicate you've got a skipped chain.  I have not heard of this on the 
in-line motor but, have seen this kind of damage on my SLC  V8...380 
motor that I junked some years backs.

Dick

Iain Gunn wrote:

> Hi Guys, me again. Changed the EZL and the crank sensor, still 

> reacting the same, I'm obviously missing something big time.

> I have spark on all cylinders, I have fuel. Verified  that rotor is in 

> correct position when piston @ TDC  #1

> Anybody got any other ideas?

> One thing I'm looking for and haven't found yet is the R16 resistor, 

> flat plug in unit. Manual says its near the EZL, can't see it. Other 

> have said its near the battery??

>  Problem is there are no competent MB guys within 100 kms of me even 

> if I wanted to take it in to a shop.

>  

> *_Original Message _*

> 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.

>

>     ----- Original Message -----

>     *From:* Steve Lemberg <mailto:stevenlemberg at sbcglobal.net>

>     *To:* Mercedes Coupes Mailing Lists <mailto:mbcoupes at mbcoupes.com>

>     *Sent:* Wednesday, January 02, 2008 11:08 PM

>     *Subject:* Re: [W126 Coupe] Off topic 190E 2.6

>

>     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 <mailto:igunn at bmts.com>

>         *To:* Mercedes Coupes Mailing Lists

>         <mailto:mbcoupes at mbcoupes.com>

>         *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 <mailto:stevenlemberg at sbcglobal.net>

>             *To:* Mercedes Coupes Mailing Lists

>             <mailto:mbcoupes at mbcoupes.com>

>             *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

>

>                  

>                  

>                  

>

>                  

>

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